1
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Ma Q, Li D, Ren Y, Chen Y, Huang J, Wu B, Wang Q, Luo Z. Transient autophagy inhibition strengthened postharvest tomato (Solanum lycopersicum) resistance against Botrytis cinerea through curtailing ROS-induced programmed cell death. Food Chem 2024; 454:139811. [PMID: 38820631 DOI: 10.1016/j.foodchem.2024.139811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 04/17/2024] [Accepted: 05/22/2024] [Indexed: 06/02/2024]
Abstract
Autophagy (AU) and programmed cell death (PCD) are dynamically regulated during tomato fruit defense against Botrytis cinerea, which are also manipulated by pathogenic effectors to promote colonization. Present study demonstrated that the enhanced defense induced by transient inhibition on AU by hydroxychloroquine (HCQ) facilitated the restriction of B. cinerea lesion on postharvest tomato. Pre-treatment of 2 mM (16.08 ± 3.42 cm at 7 d) and 6 mM (7.80 ± 2.39 cm at 7 d) HCQ inhibited the lesion development of B. cinerea compared with Mock treatment (50.02 ± 7.69 cm at 7 d). Transient inhibition of AU induced expression of fungal defense and transcriptional regulation related genes, but attenuated reactive oxygen species (ROS) burst gene expression. The ROS-induced PCD was compromised by HCQ with promoted ROS scavenging. The transient pre-treatment of HCQ slightly inhibited AU which triggered the feedback loop that enhanced the autophagic activity defensing against B. cinerea infection.
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Affiliation(s)
- Quan Ma
- Zhejiang University, College of Biosystems Engineering and Food Science, The Rural Development Academy, Zhejiang University, Hangzhou 310058, China
| | - Dong Li
- Zhejiang University, College of Biosystems Engineering and Food Science, The Rural Development Academy, Zhejiang University, Hangzhou 310058, China.
| | - Yicheng Ren
- Zhejiang University, College of Biosystems Engineering and Food Science, The Rural Development Academy, Zhejiang University, Hangzhou 310058, China
| | - Yanpei Chen
- Zhejiang University, College of Biosystems Engineering and Food Science, The Rural Development Academy, Zhejiang University, Hangzhou 310058, China
| | - Jing Huang
- Zhejiang University, College of Biosystems Engineering and Food Science, The Rural Development Academy, Zhejiang University, Hangzhou 310058, China
| | - Bin Wu
- Institute of Agro-products Storage and Processing & Xinjiang Key Laboratory of Processing and Preservation of Agricultural Products, Xinjiang Academy of Agricultural Science, Urumqi 830091, China
| | - Qingqing Wang
- Zhejiang University, College of Biosystems Engineering and Food Science, The Rural Development Academy, Zhejiang University, Hangzhou 310058, China
| | - Zisheng Luo
- Zhejiang University, College of Biosystems Engineering and Food Science, The Rural Development Academy, Zhejiang University, Hangzhou 310058, China; Key Laboratory of Agro-Products Postharvest Handling of Ministry of Agriculture and Rural Affairs, Zhejiang Key Laboratory for Agri-Food Processing, Zhejiang University, Hangzhou 310058, China; Ningbo Innovation Center, Zhejiang University, Ningbo 315100, China.
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2
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Xiong X, Zeng J, Ning Q, Liu H, Bu Z, Zhang X, Zeng J, Zhuo R, Cui K, Qin Z, Gao Y, Liu X, Zhu Y. Ferroptosis induction in host rice by endophyte OsiSh-2 is necessary for mutualism and disease resistance in symbiosis. Nat Commun 2024; 15:5012. [PMID: 38866764 PMCID: PMC11169551 DOI: 10.1038/s41467-024-49099-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 05/21/2024] [Indexed: 06/14/2024] Open
Abstract
Ferroptosis is an iron-dependent cell death that was discovered recently. For beneficial microbes to establish mutualistic relationships with hosts, precisely controlled cell death in plant cells is necessary. However, whether ferroptosis is involved in the endophyte‒plant system is poorly understood. Here, we reported that endophytic Streptomyces hygroscopicus OsiSh-2, which established a sophisticated and beneficial interaction with host rice plants, caused ferroptotic cell death in rice characterized by ferroptosis- and immune-related markers. Treatments with ferroptosis inhibitors and inducers, different doses of OsiSh-2, and the siderophore synthesis-deficient mutant ΔcchH revealed that only moderate ferroptosis induced by endophytes is essential for the establishment of an optimal symbiont to enhance plant growth. Additionally, ferroptosis involved in a defence-primed state in rice, which contributed to improved resistance against rice blast disease. Overall, our study provides new insights into the mechanisms of endophyte‒plant interactions mediated by ferroptosis and suggests new directions for crop yield promotion.
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Affiliation(s)
- Xianqiu Xiong
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410082, Hunan, PR China
| | - Jing Zeng
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410082, Hunan, PR China
| | - Qing Ning
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410082, Hunan, PR China
| | - Heqin Liu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410082, Hunan, PR China
| | - Zhigang Bu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410082, Hunan, PR China
| | - Xuan Zhang
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410082, Hunan, PR China
| | - Jiarui Zeng
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410082, Hunan, PR China
| | - Rui Zhuo
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410082, Hunan, PR China
| | - Kunpeng Cui
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410082, Hunan, PR China
| | - Ziwei Qin
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410082, Hunan, PR China
| | - Yan Gao
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410082, Hunan, PR China.
| | - Xuanming Liu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410082, Hunan, PR China.
| | - Yonghua Zhu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410082, Hunan, PR China.
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3
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Chen S, Tan S, Jin Z, Wu J, Zhao Y, Xu W, Liu S, Li Y, Huang H, Bao F, Xie J. The transcriptional landscape of Populus pattern/effector-triggered immunity and how PagWRKY18 involved in it. PLANT, CELL & ENVIRONMENT 2024; 47:2074-2092. [PMID: 38409861 DOI: 10.1111/pce.14860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 02/07/2024] [Accepted: 02/09/2024] [Indexed: 02/28/2024]
Abstract
Plants trigger a robust immune response by activating massive transcriptome reprogramming through crosstalk between PTI and ETI. However, how PTI and ETI contribute to the quantitative or/and qualitative output of immunity and how they work together when both are being activated were unclear. In this study, we performed a comprehensive overview of pathogen-triggered transcriptomic reprogramming by analyzing temporal changes in the transcriptome up to 144 h after Colletotrichum gloeosporioides inoculated in Populus. Moreover, we constructed a hierarchical gene regulatory network of PagWRKY18 and its potential target genes to explore the underlying regulatory mechanisms of PagWRKY18 that are not yet clear. Interestingly, we confirmed that PagWRKY18 protein can directly bind the W-box elements in the promoter of a transmembrane leucine-rich repeat receptor-like kinase, PagSOBIR1 gene, to trigger PTI. At the same time, PagWRKY18 functions in disease tolerance by modulation of ROS homeostasis and induction of cell death via directly targeting PagGSTU7 and PagPR4 respectively. Furthermore, PagPR4 can interact with PagWRKY18 to inhibit the expression of PagPR4 genes, forming a negative feedback loop. Taken together, these results suggest that PagWRKY18 may be involved in regulating crosstalk between PTI and ETI to activate a robust immune response and maintain intracellular homeostasis.
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Affiliation(s)
- Sisi Chen
- State Key Laboratory of Tree Genetics and Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- National Engineering Research Center of Tree Breeding and Ecological Restoration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, Beijing Forestry University, Beijing, China
| | - Shuxian Tan
- State Key Laboratory of Tree Genetics and Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- National Engineering Research Center of Tree Breeding and Ecological Restoration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, Beijing Forestry University, Beijing, China
| | - Zhelun Jin
- State Key Laboratory of Tree Genetics and Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- National Engineering Research Center of Tree Breeding and Ecological Restoration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, Beijing Forestry University, Beijing, China
| | - Jiadong Wu
- State Key Laboratory of Tree Genetics and Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- National Engineering Research Center of Tree Breeding and Ecological Restoration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, Beijing Forestry University, Beijing, China
| | - Yiyang Zhao
- State Key Laboratory of Tree Genetics and Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- National Engineering Research Center of Tree Breeding and Ecological Restoration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, Beijing Forestry University, Beijing, China
| | - Weijie Xu
- State Key Laboratory of Tree Genetics and Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- National Engineering Research Center of Tree Breeding and Ecological Restoration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, Beijing Forestry University, Beijing, China
| | - Sijia Liu
- State Key Laboratory of Tree Genetics and Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- National Engineering Research Center of Tree Breeding and Ecological Restoration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, Beijing Forestry University, Beijing, China
| | - Yue Li
- State Key Laboratory of Tree Genetics and Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- National Engineering Research Center of Tree Breeding and Ecological Restoration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, Beijing Forestry University, Beijing, China
| | - Huahong Huang
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, Lin'an, China
| | - Fei Bao
- State Key Laboratory of Tree Genetics and Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- National Engineering Research Center of Tree Breeding and Ecological Restoration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, Beijing Forestry University, Beijing, China
| | - Jianbo Xie
- State Key Laboratory of Tree Genetics and Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- National Engineering Research Center of Tree Breeding and Ecological Restoration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration, Beijing Forestry University, Beijing, China
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Du Z, Weng H, Jia H, Zhang B, Wu B, Chen W, Liu T, Gao L. Characterization of a Small Cysteine-Rich Secreted Effector, TcSCP_9014, in Tilletia controversa. PLANTS (BASEL, SWITZERLAND) 2024; 13:1523. [PMID: 38891331 PMCID: PMC11174917 DOI: 10.3390/plants13111523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2024] [Revised: 05/20/2024] [Accepted: 05/23/2024] [Indexed: 06/21/2024]
Abstract
Tilletia controversa J. G. Kühn is the causal agent of wheat dwarf bunt (DB), a destructive disease causing tremendous economic losses. Small cysteine-rich secreted proteins (SCPs) of plant fungi are crucial in modulating host immunity and promoting infection. Little is known about the virulence effectors of T. controversa. Here, we characterized TcSCP_9014, a novel effector of SCPs, in T. controversa which suppressed programmed cell death triggered by BAX without relying on its signal peptide (SP). The SP in the N-terminus of TcSCP_9014 was functional in the secretory process. Live-cell imaging in the epidermal cells of Nicothiana benthamiana suggested that TcSCP_9014 localized to the plasma membrane, cytoplasm, and nucleus. Furthermore, yeast cDNA library screening was performed to obtain the interacting proteins in wheat. Yeast two-hybrid and BiFC assays were applied to validate the interaction of TcSCP_9014 with TaMTAN and TaGAPDH. Our work revealed that the novel effector TcSCP_9014 is vital in modulating plant immunity, which opens up new avenues for plant-pathogen interactions in the T. controversa infection process.
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Affiliation(s)
- Zhenzhen Du
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- College of Plant Protection, China Agricultural University, Beijing 100193, China
| | - Han Weng
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- College of Plant Protection, China Agricultural University, Beijing 100193, China
| | - Huanyu Jia
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Bin Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Boming Wu
- College of Plant Protection, China Agricultural University, Beijing 100193, China
| | - Wanquan Chen
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Taiguo Liu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Li Gao
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences, Key Laboratory of Integrated Pest Management on Crop in Northwestern Oasis, Ministry of China, Scientific Observing and Experimental Station of Korla, Ministry of Agriculture, Urumqi 830091, China
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5
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Villano C, Procino S, Blaiotta G, Carputo D, D’Agostino N, Di Serio E, Fanelli V, La Notte P, Miazzi MM, Montemurro C, Taranto F, Aversano R. Genetic diversity and signature of divergence in the genome of grapevine clones of Southern Italy varieties. FRONTIERS IN PLANT SCIENCE 2023; 14:1201287. [PMID: 37771498 PMCID: PMC10525710 DOI: 10.3389/fpls.2023.1201287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 08/21/2023] [Indexed: 09/30/2023]
Abstract
Sexual reproduction has contributed to a significant degree of variability in cultivated grapevine populations. However, the additional influence of spontaneous somatic mutations has played a pivotal role in shaping the diverse landscape of grapevine agrobiodiversity. These naturally occurring selections, termed 'clones,' represent a vast reservoir of potentially valuable traits and alleles that hold promise for enhancing grape quality and bolstering plant resilience against environmental and biotic challenges. Despite their potential, many of these clones remain largely untapped.In light of this context, this study aims to delve into the population structure, genetic diversity, and distinctive genetic loci within a collection of 138 clones derived from six Campanian and Apulian grapevine varieties, known for their desirable attributes in viticulture and winemaking. Employing two reduced representation sequencing methods, we extracted Single-Nucleotide Polymorphism (SNP) markers. Population structure analysis and fixation index (FST) calculations were conducted both between populations and at individual loci. Notably, varieties originating from the same geographical region exhibited pronounced genetic similarity.The resulting SNP dataset facilitated the identification of approximately two hundred loci featuring divergent markers (FST ≥ 0.80) within annotated exons. Several of these loci exhibited associations with essential traits like phenotypic adaptability and environmental responsiveness, offering compelling opportunities for grapevine breeding initiatives. By shedding light on the genetic variability inherent in these treasured traditional grapevines, our study contributes to the broader understanding of their potential. Importantly, it underscores the urgency of preserving and characterizing these valuable genetic resources to safeguard their intra-varietal diversity and foster future advancements in grapevine cultivation.
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Affiliation(s)
- Clizia Villano
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
| | - Silvia Procino
- Department of Soil, Plant and Food Sciences, University of Bari Aldo Moro, Bari, Italy
- Institute of Biosciences and Bioresources (CNR-IBBR), Bari, Italy
| | - Giuseppe Blaiotta
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
| | - Domenico Carputo
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
| | - Nunzio D’Agostino
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
- Institute of Biosciences and Bioresources (CNR-IBBR), Bari, Italy
| | - Ermanno Di Serio
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
| | - Valentina Fanelli
- Department of Soil, Plant and Food Sciences, University of Bari Aldo Moro, Bari, Italy
| | - Pierfederico La Notte
- Support Unit Bari, Institute for Sustainable Plant Protection, National Research Council of Italy (CNR), Bari, Italy
| | | | - Cinzia Montemurro
- Department of Soil, Plant and Food Sciences, University of Bari Aldo Moro, Bari, Italy
- Support Unit Bari, Institute for Sustainable Plant Protection, National Research Council of Italy (CNR), Bari, Italy
- SINAGRI S.r.l., Spin Off of the University of Bari Aldo Moro, Bari, Italy
| | | | - Riccardo Aversano
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
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Wang C, Wang J, Zhang D, Cheng J, Zhu J, Yang Z. Identification and functional analysis of protein secreted by Alternaria solani. PLoS One 2023; 18:e0281530. [PMID: 36877688 PMCID: PMC9987770 DOI: 10.1371/journal.pone.0281530] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 01/25/2023] [Indexed: 03/07/2023] Open
Abstract
Early blight, caused by the necrotrophic fungus Alternaria solani, is an important foliar disease that causes major yield losses of potato. Effector proteins secreted by pathogens to host cells can inhibit host immune response to pathogens. Currently, the function of effector proteins secreted by A. solani during infection is poorly understood. In this study, we identified and characterized a novel candidate effector protein, AsCEP50. AsCEP50 is a secreted protein that is highly expressed throughout the infection stages of A. solani. Agrobacterium tumefaciens-mediated transient expression in Nicotiana benthamiana and tomato demonstrated that AsCEP50 is located on the plasma membrane of N. benthamiana and regulates senescence-related genes, resulting in the chlorosis of N. benthamiana and tomato leaves. Δ50 mutants were unaffected in vegetative growth, spore formation and mycelium morphology. However, the deletion of AsCEP50 significantly reduced virulence, melanin production and penetration of A. solani. These results strongly supported that AsCEP50 is an important pathogenic factor at the infection stage and contributes to the virulence of Alternaria solani.
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Affiliation(s)
- Chen Wang
- College of Plant Protection, Hebei Agricultural University, Baoding, P. R. China
| | - Jinhui Wang
- College of Plant Protection, Hebei Agricultural University, Baoding, P. R. China
| | - Dai Zhang
- College of Plant Protection, Hebei Agricultural University, Baoding, P. R. China
| | - Jianing Cheng
- College of Plant Protection, Hebei Agricultural University, Baoding, P. R. China
| | - Jiehua Zhu
- College of Plant Protection, Hebei Agricultural University, Baoding, P. R. China
- Technological Innovation Center for Biological Control of Crop Diseases and Insect Pests of Hebei Province, Baoding, P. R. China
- * E-mail: (JZ); (ZY)
| | - Zhihui Yang
- College of Plant Protection, Hebei Agricultural University, Baoding, P. R. China
- Technological Innovation Center for Biological Control of Crop Diseases and Insect Pests of Hebei Province, Baoding, P. R. China
- * E-mail: (JZ); (ZY)
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7
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Guan F, Shi B, Zhang J, Wan X. Transcriptome analysis provides insights into lignin synthesis and MAPK signaling pathway that strengthen the resistance of bitter gourd (Momordica charantia) to Fusarium wilt. Genomics 2023; 115:110538. [PMID: 36494076 DOI: 10.1016/j.ygeno.2022.110538] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 11/27/2022] [Accepted: 12/05/2022] [Indexed: 12/12/2022]
Abstract
Fusarium wilt is a typical soil-borne disease caused by Fusarium oxysporum f. sp. momordicae (FOM) in bitter gourd. In this study, by comparing sequencing data at multiple time points and considering the difference between resistant (R) and susceptible (S) varieties, differentially expressed genes were screened out. Short time-series expression miner analysis revealed the upregulated expression trend of genes, which were enriched in phenylpropanoid biosynthesis, plant-pathogen interaction, and mitogen-activated protein kinase signaling pathway. Further, observation of the microstructure revealed that the R variety may form tyloses earlier than the S variety to prevent mycelium diffusion from the xylem vessel. After Fusarium wilt infection, the enzymatic activities of superoxide dismutase, peroxidase, phenylalanine ammonia lyase, and catalaseas well as levels of superoxide anion and malondialdehyde were increased in the R variety higher than those in the S variety. This study provides a reference to elucidate the disease resistance mechanism of bitter gourd.
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Affiliation(s)
- Feng Guan
- Institute of Vegetables and Flowers, Jiangxi Academy of Agricultural Sciences, Nanchang, China.
| | - Bo Shi
- Institute of Vegetables and Flowers, Jiangxi Academy of Agricultural Sciences, Nanchang, China
| | - Jingyun Zhang
- Institute of Vegetables and Flowers, Jiangxi Academy of Agricultural Sciences, Nanchang, China
| | - Xinjian Wan
- Institute of Vegetables and Flowers, Jiangxi Academy of Agricultural Sciences, Nanchang, China.
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8
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Mao L, Ge L, Ye X, Xu L, Si W, Ding T. ZmGLP1, a Germin-like Protein from Maize, Plays an Important Role in the Regulation of Pathogen Resistance. Int J Mol Sci 2022; 23:ijms232214316. [PMID: 36430797 PMCID: PMC9699084 DOI: 10.3390/ijms232214316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 11/10/2022] [Accepted: 11/12/2022] [Indexed: 11/22/2022] Open
Abstract
A gene encoding a protein similar to germin-like proteins (GLPs) was obtained from maize (Zea mays) and designated as ZmGLP1. Based on the ZmGLP1 conserved domain and phylogenetic status, ZmGLP1 was grouped into GLP subfamily b and has high similarity to OsGLP8-14 from Oryza sativa. ZmGLP1 is expressed in different maize tissues during different growth stages and is mainly expressed in the stems and leaves. The induced expression patterns confirmed that ZmGLP1 is differentially expressed under abiotic and hormone stress; it had an early response to jasmonic acid (JA) and ethephon (ET) but a late response to salicylic acid (SA) and was significantly upregulated under Bipolaris maydis infection. The overexpression of ZmGLP1 in Arabidopsis improved the resistance to biotrophic Pseudomonas syringae pv. tomato DC3000 (PstDC3000) and necrotrophic Sclerotinia sclerotiorum by inducing the expression of JA signaling-related genes. Moreover, the hydrogen peroxide (H2O2) content increased due to the overexpression of ZmGLP1 in Arabidopsis after pathogen infection. Compared to the wild-type control, the H2O2 content of ZmGLP1-overexpressing Arabidopsis infected by PstDC3000 increased significantly but was lower in transgenic plants infected with S. sclerotiorum. Furthermore, high-performance liquid chromatography-tandem mass (HPLC-MS/MS) spectrometry showed that the JA contents of ZmGLP1-overexpressing Arabidopsis markedly increased after pathogen infection. However, the improved resistance of ZmGLP1-overexpressing Arabidopsis pretreated with the JA biosynthetic inhibitor, sodium diethyldithiocarbamate trihydrate (DIECA), was suppressed. Based on these findings, we speculate that ZmGLP1 plays an important role in the regulation of Arabidopsis resistance to biotrophic PstDC3000 and necrotrophic S. sclerotiorum; the regulatory effects are achieved by inducing plant oxidative burst activity and activation of the JA signaling pathway.
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Affiliation(s)
- Lixue Mao
- Key Laboratory of Biology and Sustainable Management of Plant Diseases and Pests of Anhui Higher Education Institutes, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Lijie Ge
- Key Laboratory of Biology and Sustainable Management of Plant Diseases and Pests of Anhui Higher Education Institutes, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Xinchun Ye
- Key Laboratory of Biology and Sustainable Management of Plant Diseases and Pests of Anhui Higher Education Institutes, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Li Xu
- National Engineering Laboratory of Crop Stress Resistance Breeding, School of Life Sciences, Anhui Agricultural University, Hefei 230036, China
| | - Weina Si
- National Engineering Laboratory of Crop Stress Resistance Breeding, School of Life Sciences, Anhui Agricultural University, Hefei 230036, China
| | - Ting Ding
- Key Laboratory of Biology and Sustainable Management of Plant Diseases and Pests of Anhui Higher Education Institutes, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
- Correspondence: or ; Tel.: +86-551-6578-6464; Fax: +86-551-6578-6021
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9
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Kim CY, Song H, Lee YH. Ambivalent response in pathogen defense: A double-edged sword? PLANT COMMUNICATIONS 2022; 3:100415. [PMID: 35918895 PMCID: PMC9700132 DOI: 10.1016/j.xplc.2022.100415] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 06/29/2022] [Accepted: 07/25/2022] [Indexed: 05/16/2023]
Abstract
Plants possess effective immune systems that defend against most microbial attackers. Recent plant immunity research has focused on the classic binary defense model involving the pivotal role of small-molecule hormones in regulating the plant defense signaling network. Although most of our current understanding comes from studies that relied on information derived from a limited number of pathosystems, newer studies concerning the incredibly diverse interactions between plants and microbes are providing additional insights into other novel mechanisms. Here, we review the roles of both classical and more recently identified components of defense signaling pathways and stress hormones in regulating the ambivalence effect during responses to diverse pathogens. Because of their different lifestyles, effective defense against biotrophic pathogens normally leads to increased susceptibility to necrotrophs, and vice versa. Given these opposing forces, the plant potentially faces a trade-off when it mounts resistance to a specific pathogen, a phenomenon referred to here as the ambivalence effect. We also highlight a novel mechanism by which translational control of the proteins involved in the ambivalence effect can be used to engineer durable and broad-spectrum disease resistance, regardless of the lifestyle of the invading pathogen.
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Affiliation(s)
- Chi-Yeol Kim
- Department of Agricultural Biotechnology, Seoul National University, Seoul 08826, Korea; Plant Immunity Research Center, Seoul National University, Seoul 08826, Korea; Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
| | - Hyeunjeong Song
- Interdisciplinary Program in Agricultural Genomics, Seoul National University, Seoul 08826, Korea
| | - Yong-Hwan Lee
- Department of Agricultural Biotechnology, Seoul National University, Seoul 08826, Korea; Plant Immunity Research Center, Seoul National University, Seoul 08826, Korea; Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea; Interdisciplinary Program in Agricultural Genomics, Seoul National University, Seoul 08826, Korea; Center for Fungal Genetic Resources, Seoul National University, Seoul 08826, Korea.
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10
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Wang C, Zhang D, Cheng J, Zhao D, Pan Y, Li Q, Zhu J, Yang Z, Wang J. Identification of effector CEP112 that promotes the infection of necrotrophic Alternaria solani. BMC PLANT BIOLOGY 2022; 22:466. [PMID: 36171557 PMCID: PMC9520946 DOI: 10.1186/s12870-022-03845-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 09/12/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND Alternaria solani is a typical necrotrophic pathogen that can cause severe early blight on Solanaceae crops and cause ring disease on plant leaves. Phytopathogens produce secretory effectors that regulate the host immune response and promote pathogenic infection. Effector proteins, as specialized secretions of host-infecting pathogens, play important roles in disrupting host defense systems. At present, the role of the effector secreted by A. solani during infection remains unclear. We report the identification and characterization of AsCEP112, an effector required for A. solani virulence. RESULT The AsCEP112 gene was screened from the transcriptome and genome of A. solani on the basis of typical effector signatures. Fluorescence quantification and transient expression analysis showed that the expression level of AsCEP112 continued to increase during infection. The protein localized to the cell membrane of Nicotiana benthamiana and regulated senescence-related genes, resulting in the chlorosis of N. benthamiana and tomato leaves. Moreover, comparative analysis of AsCEP112 mutant obtained by homologous recombination with wild-type and revertant strains indicated that AsCEP112 gene played an active role in regulating melanin formation and penetration in the pathogen. Deletion of AsCEP112 also reduced the pathogenicity of HWC-168. CONCLUSION Our findings demonstrate that AsCEP112 was an important effector protein that targeted host cell membranes. AsCEP112 regulateed host senescence-related genes to control host leaf senescence and chlorosis, and contribute to pathogen virulence.
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Affiliation(s)
- Chen Wang
- College of Plant Protection, Hebei Agricultural University, Baoding, 071001, People's Republic of China
| | - Dai Zhang
- College of Plant Protection, Hebei Agricultural University, Baoding, 071001, People's Republic of China
| | - Jianing Cheng
- College of Plant Protection, Hebei Agricultural University, Baoding, 071001, People's Republic of China
| | - Dongmei Zhao
- College of Plant Protection, Hebei Agricultural University, Baoding, 071001, People's Republic of China
| | - Yang Pan
- College of Plant Protection, Hebei Agricultural University, Baoding, 071001, People's Republic of China
| | - Qian Li
- College of Plant Protection, Hebei Agricultural University, Baoding, 071001, People's Republic of China
| | - Jiehua Zhu
- College of Plant Protection, Hebei Agricultural University, Baoding, 071001, People's Republic of China.
- Technological Innovation Center for Biological Control of Crop Diseases and Insect Pests of Hebei Province, Baoding, 071001, People's Republic of China.
| | - Zhihui Yang
- College of Plant Protection, Hebei Agricultural University, Baoding, 071001, People's Republic of China.
- Technological Innovation Center for Biological Control of Crop Diseases and Insect Pests of Hebei Province, Baoding, 071001, People's Republic of China.
| | - Jinhui Wang
- College of Plant Protection, Hebei Agricultural University, Baoding, 071001, People's Republic of China.
- Technological Innovation Center for Biological Control of Crop Diseases and Insect Pests of Hebei Province, Baoding, 071001, People's Republic of China.
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11
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Dey S, Sarkar A, Chowdhury S, Singh R, Mukherjee A, Ghosh Z, Kundu P. Heightened miR6024-NLR interactions facilitate necrotrophic pathogenesis in tomato. PLANT MOLECULAR BIOLOGY 2022; 109:717-739. [PMID: 35499677 DOI: 10.1007/s11103-022-01270-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Accepted: 03/27/2022] [Indexed: 06/14/2023]
Abstract
miR6024 acts as a negative regulator of R genes, hence of Tomato plant immunity, and facilitates disease by the necrotrophic pathogen A. solani. Plant resistance genes or Nucleotide-binding leucine-rich repeat (NLR) genes, integral components of plant disease stress-signaling are targeted by variable groups of miRNAs. However, the significance of miRNA-mediated regulation of NLRs during a pathogen stress response, specifically for necrotrophic fungus, is poorly understood. A thorough examination of Tomato NLRs and miRNAs could map substantial interactions of which half the annotated NLRs were targets of Solanaceae-specific and conserved miRNAs, at the NB subdomain. The Solanaceae-specific miR6024 and its NLR targets analysed in different phytopathogenic stresses revealed differential and mutually antagonistic regulation. Interestingly, miR6024-targeted cleavage of a target NLR also triggered the generation of secondary phased siRNAs which could potentially amplify the defense signal. RNA-seq analysis of leaf tissues from miR6024 overexpressing Tomato plants evidenced a perturbation in the defense transcriptome with the transgenics showing unwarranted immune response-related genes' expression with or without infection with necrotrophic Alternaria solani, though no adverse effect could be observed in the growth and development of the transgenic plants. Transgenic plants exhibited constitutive downregulation of the target NLRs, aggravated disease phenotype with an enhanced lesion, greater ROS generation and hypersusceptibility to A. solani infection, thus establishing that miR6024 negatively impacts plant immune response during necrotrophic pathogenesis. Limited knowledge about the outcome of NLR-miRNA interaction during necrotrophic pathogenesis is a hindrance to the deployment of miRNAs in crop improvement programs. With the elucidation of the necrotrophic disease-synergistic role played by miR6024, it becomes a potent candidate for biotechnological manipulation for the rapid development of pathogen-tolerant solanaceous plants.
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Affiliation(s)
- Sayani Dey
- Division of Plant Biology, Unified Academic Campus, Bose Institute, EN 80, Bidhan Nagar, Kolkata, West Bengal, 700091, India
| | - Arijita Sarkar
- Division of Bioinformatics, Unified Academic Campus, Bose Institute, EN 80, Bidhan Nagar, Kolkata, West Bengal, 700091, India
| | - Shreya Chowdhury
- Division of Plant Biology, Unified Academic Campus, Bose Institute, EN 80, Bidhan Nagar, Kolkata, West Bengal, 700091, India
| | - Raghuvir Singh
- Division of Plant Biology, Unified Academic Campus, Bose Institute, EN 80, Bidhan Nagar, Kolkata, West Bengal, 700091, India
| | - Ananya Mukherjee
- Division of Plant Biology, Unified Academic Campus, Bose Institute, EN 80, Bidhan Nagar, Kolkata, West Bengal, 700091, India
| | - Zhumur Ghosh
- Division of Bioinformatics, Unified Academic Campus, Bose Institute, EN 80, Bidhan Nagar, Kolkata, West Bengal, 700091, India
| | - Pallob Kundu
- Division of Plant Biology, Unified Academic Campus, Bose Institute, EN 80, Bidhan Nagar, Kolkata, West Bengal, 700091, India.
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12
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Basak S, Kundu P. Plant metacaspases: Decoding their dynamics in development and disease. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2022; 180:50-63. [PMID: 35390704 DOI: 10.1016/j.plaphy.2022.03.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 03/02/2022] [Accepted: 03/20/2022] [Indexed: 06/14/2023]
Abstract
Plant metacaspases were evolved in parallel to well-characterized animal counterpart caspases and retained the similar histidine-cysteine catalytic dyad, leading to functional congruity between these endopeptidases. Although phylogenetic relatedness of the catalytic domain and functional commonality placed these proteases in the caspase family, credible counterarguments predominantly about their distinct substrate specificity raised doubts about the classification. Metacaspases are involved in regulating the PCD during development as well as in senescence. Balancing acts of metacaspase activity also dictate cell fate during defense upon the perception of adverse environmental cues. Accordingly, their activity is tightly regulated, while suppressing spurious activation, by a combination of genetic and post-translational modifications. Structural insights from recent studies provided vital clues on the functionality. This comprehensive review aims to explore the origin of plant metacaspases, and their regulatory and functional diversity in different plants while discussing their analogy to mammalian caspases. Besides, we have presented various modern methodologies for analyzing the proteolytic activity of these indispensable molecules in the healthy or stressed life of a plant. The review would serve as a repository of all the available pieces of evidence indicating metacaspases as the key regulator of PCD across the plant kingdom and highlight the prospect of studying metacaspases for their inclusion in a crop improvement program.
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Affiliation(s)
- Shrabani Basak
- Division of Plant Biology, Bose Institute, EN-80, Sector V, Bidhannagar, Kolkata, 700091, West Bengal, India.
| | - Pallob Kundu
- Division of Plant Biology, Bose Institute, EN-80, Sector V, Bidhannagar, Kolkata, 700091, West Bengal, India.
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13
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Kolozsváriné Nagy J, Schwarczinger I, Király L, Bacsó R, Ádám AL, Künstler A. Near-Isogenic Barley Lines Show Enhanced Susceptibility to Powdery Mildew Infection Following High-Temperature Stress. PLANTS 2022; 11:plants11070903. [PMID: 35406883 PMCID: PMC9003484 DOI: 10.3390/plants11070903] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 03/23/2022] [Accepted: 03/25/2022] [Indexed: 11/16/2022]
Abstract
Barley cultivation is adversely affected by high-temperature stress, which may modulate plant defense responses to pathogens such as barley powdery mildew (Blumeria graminis f. sp. hordei, Bgh). Earlier research focused mainly on the influence of short-term heat stress (heat shock) of barley on Bgh infection. In this study, our aim was to investigate the effects of both short- and long-term heat stress (35 °C from 30 s to 5 days) on Bgh infection in the barley cultivar Ingrid and its near-isogenic lines containing different powdery mildew resistance genes (Mla12, Mlg, and mlo5) by analyzing symptom severity and Bgh biomass with RT-qPCR. The expression of selected barley defense genes (BAX inhibitor-1, Pathogenesis- related protein-1b, Respiratory burst oxidase homologue F2, and Heat shock protein 90-1) was also monitored in plants previously exposed to heat stress followed by inoculation with Bgh. We demonstrated that pre-exposure to short- and long-term heat stress negatively affects the resistance of all resistant lines manifested by the appearance of powdery mildew symptoms and increased Bgh biomass. Furthermore, prolonged heat stress (48 and 120 h) enhanced both Bgh symptoms and biomass in susceptible wild-type Ingrid. Heat stress suppressed and delayed early defense gene activation in resistant lines, which is a possible reason why resistant barley became partially susceptible to Bgh.
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14
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Santos MDL, de Resende MLV, dos Santos Ciscon BA, Freitas NC, Pereira MHDB, Reichel T, Mathioni SM. LysM receptors in Coffea arabica: Identification, characterization, and gene expression in response to Hemileia vastatrix. PLoS One 2022; 17:e0258838. [PMID: 35143519 PMCID: PMC8830669 DOI: 10.1371/journal.pone.0258838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 01/28/2022] [Indexed: 11/24/2022] Open
Abstract
Pathogen‐associated molecular patterns (PAMPs) are recognized by pattern recognition receptors (PRRs) localized on the host plasma membrane. These receptors activate a broad-spectrum and durable defense, which are desired characteristics for disease resistance in plant breeding programs. In this study, candidate sequences for PRRs with lysin motifs (LysM) were investigated in the Coffea arabica genome. For this, approaches based on the principle of sequence similarity, conservation of motifs and domains, phylogenetic analysis, and modulation of gene expression in response to Hemileia vastatrix were used. The candidate sequences for PRRs in C. arabica (Ca1-LYP, Ca2-LYP, Ca1-CERK1, Ca2-CERK1, Ca-LYK4, Ca1-LYK5 and Ca2-LYK5) showed high similarity with the reference PRRs used: Os-CEBiP, At-CERK1, At-LYK4 and At-LYK5. Moreover, the ectodomains of these sequences showed high identity or similarity with the reference sequences, indicating structural and functional conservation. The studied sequences are also phylogenetically related to the reference PRRs described in Arabidopsis, rice, and other plant species. All candidates for receptors had their expression induced after the inoculation with H. vastatrix, since the first time of sampling at 6 hours post‐inoculation (hpi). At 24 hpi, there was a significant increase in expression, for most of the receptors evaluated, and at 48 hpi, a suppression. The results showed that the candidate sequences for PRRs in the C. arabica genome display high homology with fungal PRRs already described in the literature. Besides, they respond to pathogen inoculation and seem to be involved in the perception or signaling of fungal chitin, acting as receptors or co-receptors of this molecule. These findings represent an advance in the understanding of the basal immunity of this species.
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Affiliation(s)
- Mariana de Lima Santos
- Programa de Pós-graduação em Biotecnologia Vegetal, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
- * E-mail: (MLS); (MLVR)
| | | | | | - Natália Chagas Freitas
- Departamento de Fitopatologia, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
| | | | - Tharyn Reichel
- Departamento de Fitopatologia, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
| | - Sandra Marisa Mathioni
- Departamento de Fitopatologia, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
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15
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Macabuhay A, Arsova B, Walker R, Johnson A, Watt M, Roessner U. Modulators or facilitators? Roles of lipids in plant root-microbe interactions. TRENDS IN PLANT SCIENCE 2022; 27:180-190. [PMID: 34620547 DOI: 10.1016/j.tplants.2021.08.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 07/28/2021] [Accepted: 08/24/2021] [Indexed: 05/15/2023]
Abstract
Lipids have diverse functions in regulating the plasma membrane's cellular processes and signaling mediation. Plasma membrane lipids are also involved in the plant's complex interactions with the surrounding microorganisms, with which plants are in various forms of symbiosis. The roles of lipids influence the whole microbial colonization process, thus shaping the rhizomicrobiome. As chemical signals, lipids facilitate the stages of rhizospheric interactions - from plant root to microbe, microbe to microbe, and microbe to plant root - and modulate the plant's defense responses upon perception or contact with either beneficial or phytopathogenic microorganisms. Although studies have come a long way, further investigation is needed to discover more lipid species and elucidate novel lipid functions and profiles under various stages of plant root-microbe interactions.
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Affiliation(s)
- Allene Macabuhay
- School of BioSciences, Faculty of Science, The University of Melbourne, Parkville, Victoria, 3010, Australia.
| | - Borjana Arsova
- Institute for Bio- & Geosciences, Plant Sciences (IBG-2), Forschungszentrum Jülich GmbH, Jülich, 52428, Germany
| | - Robert Walker
- School of BioSciences, Faculty of Science, The University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Alexander Johnson
- School of BioSciences, Faculty of Science, The University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Michelle Watt
- School of BioSciences, Faculty of Science, The University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Ute Roessner
- School of BioSciences, Faculty of Science, The University of Melbourne, Parkville, Victoria, 3010, Australia
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16
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Chang L, Yu Y, Zhang L, Wang X, Zhang S. Arginine induces the resistance of postharvest jujube fruit against Alternaria rot. FOOD QUALITY AND SAFETY 2022. [DOI: 10.1093/fqsafe/fyac008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
In order to explore the effects of arginine (Arg) treatment on postharvest Alternaria rot of jujube caused by Alternaria alternata, winter jujube was treated with different concentrations of Arg (0, 20, 200, and 1000 μmol L −1). Results showed that Arg treatment substantially inhibited the expansion of lesion diameter, and jujubes treated with 200 μmol L −1 Arg had the smallest lesion diameter. In vitro experiments demonstrated that Arg could not inhibit spore germination and mycelial growth of A. alternata. Further experimental results showed that Arg treatment reduced the production rate of O2-. and H2O2 content and improved the activities of superoxide dismutase, catalase, peroxidase, and ascorbate peroxidase in comparison with the control; Arg treatment enhanced the activities of chitinase and β-1,3-glucanase. Furthermore, Arg treatment significantly increased the activity of phenylalamine ammonia lyase and the contents of flavonoids, phenolics, and lignin. Results indicated that, although Arg could not directly inhibit the growth of pathogenic fungi as a fungicide, it can induce resistance to Alternaria rot by maintaining the balance of reactive oxygen species, increasing the activities of pathogenesis-related protein, and promoting the phenylpropane metabolism in jujube fruit tissue. Therefore, Arg treatment can be a novel measure for inducing the resistance of jujube to postharvest Alternaria rot.
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17
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Gao Y, Xiang X, Zhang Y, Cao Y, Wang B, Zhang Y, Wang C, Jiang M, Duan W, Chen D, Zhan X, Cheng S, Liu Q, Cao L. Disruption of OsPHD1, Encoding a UDP-Glucose Epimerase, Causes JA Accumulation and Enhanced Bacterial Blight Resistance in Rice. Int J Mol Sci 2022; 23:ijms23020751. [PMID: 35054937 PMCID: PMC8775874 DOI: 10.3390/ijms23020751] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 01/05/2022] [Accepted: 01/06/2022] [Indexed: 02/01/2023] Open
Abstract
Lesion mimic mutants (LMMs) have been widely used in experiments in recent years for studying plant physiological mechanisms underlying programmed cell death (PCD) and defense responses. Here, we identified a lesion mimic mutant, lm212-1, which cloned the causal gene by a map-based cloning strategy, and verified this by complementation. The causal gene, OsPHD1, encodes a UDP-glucose epimerase (UGE), and the OsPHD1 was located in the chloroplast. OsPHD1 was constitutively expressed in all organs, with higher expression in leaves and other green tissues. lm212-1 exhibited decreased chlorophyll content, and the chloroplast structure was destroyed. Histochemistry results indicated that H2O2 is highly accumulated and cell death is occurred around the lesions in lm212-1. Compared to the wild type, expression levels of defense-related genes were up-regulated, and resistance to bacterial pathogens Xanthomonas oryzae pv. oryzae (Xoo) was enhanced, indicating that the defense response was activated in lm212-1, ROS production was induced by flg22, and chitin treatment also showed the same result. Jasmonic acid (JA) and methyl jasmonate (MeJA) increased, and the JA signaling pathways appeared to be disordered in lm212-1. Additionally, the overexpression lines showed the same phenotype as the wild type. Overall, our findings demonstrate that OsPHD1 is involved in the regulation of PCD and defense response in rice.
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Affiliation(s)
- Yu Gao
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
| | - Xiaojiao Xiang
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
| | - Yingxin Zhang
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
| | - Yongrun Cao
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
| | - Beifang Wang
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
| | - Yue Zhang
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
| | - Chen Wang
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
| | - Min Jiang
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
| | - Wenjing Duan
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
| | - Daibo Chen
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
| | - Xiaodeng Zhan
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
| | - Shihua Cheng
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
| | - Qunen Liu
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
- Correspondence: (Q.L.); (L.C.); Tel.: +86-0571-6337-0218 (Q.L.); +86-0571-6337-0329 (L.C.)
| | - Liyong Cao
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 311401, China; (Y.G.); (X.X.); (Y.Z.); (Y.C.); (B.W.); (Y.Z.); (C.W.); (M.J.); (W.D.); (D.C.); (X.Z.); (S.C.)
- Northern Center of China National Rice Research Institute, China National Rice Research Institute, Shuangyashan 155100, China
- Correspondence: (Q.L.); (L.C.); Tel.: +86-0571-6337-0218 (Q.L.); +86-0571-6337-0329 (L.C.)
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18
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Bradley EL, Ökmen B, Doehlemann G, Henrissat B, Bradshaw RE, Mesarich CH. Secreted Glycoside Hydrolase Proteins as Effectors and Invasion Patterns of Plant-Associated Fungi and Oomycetes. FRONTIERS IN PLANT SCIENCE 2022; 13:853106. [PMID: 35360318 PMCID: PMC8960721 DOI: 10.3389/fpls.2022.853106] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 02/14/2022] [Indexed: 05/06/2023]
Abstract
During host colonization, plant-associated microbes, including fungi and oomycetes, deliver a collection of glycoside hydrolases (GHs) to their cell surfaces and surrounding extracellular environments. The number and type of GHs secreted by each organism is typically associated with their lifestyle or mode of nutrient acquisition. Secreted GHs of plant-associated fungi and oomycetes serve a number of different functions, with many of them acting as virulence factors (effectors) to promote microbial host colonization. Specific functions involve, for example, nutrient acquisition, the detoxification of antimicrobial compounds, the manipulation of plant microbiota, and the suppression or prevention of plant immune responses. In contrast, secreted GHs of plant-associated fungi and oomycetes can also activate the plant immune system, either by acting as microbe-associated molecular patterns (MAMPs), or through the release of damage-associated molecular patterns (DAMPs) as a consequence of their enzymatic activity. In this review, we highlight the critical roles that secreted GHs from plant-associated fungi and oomycetes play in plant-microbe interactions, provide an overview of existing knowledge gaps and summarize future directions.
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Affiliation(s)
- Ellie L. Bradley
- Bioprotection Aotearoa, School of Agriculture and Environment, Massey University, Palmerston North, New Zealand
| | - Bilal Ökmen
- Institute for Plant Sciences and Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, Cologne, Germany
- Department of Microbial Interactions, IMIT/ZMBP, University of Tübingen, Tübingen, Germany
| | - Gunther Doehlemann
- Institute for Plant Sciences and Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, Cologne, Germany
| | - Bernard Henrissat
- DTU Bioengineering, Technical University of Denmark, Kongens Lyngby, Denmark
- Architecture et Fonction des Macromolécules Biologiques (AFMB), UMR 7257 Centre National de la Recherche Scientifique (CNRS), Université Aix-Marseille, Marseille, France
- Department of Biological Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Rosie E. Bradshaw
- Bioprotection Aotearoa, School of Natural Sciences, Massey University, Palmerston North, New Zealand
| | - Carl H. Mesarich
- Bioprotection Aotearoa, School of Agriculture and Environment, Massey University, Palmerston North, New Zealand
- *Correspondence: Carl H. Mesarich,
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Gorshkov V, Tsers I. Plant susceptible responses: the underestimated side of plant-pathogen interactions. Biol Rev Camb Philos Soc 2021; 97:45-66. [PMID: 34435443 PMCID: PMC9291929 DOI: 10.1111/brv.12789] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 08/12/2021] [Accepted: 08/13/2021] [Indexed: 12/18/2022]
Abstract
Plant susceptibility to pathogens is usually considered from the perspective of the loss of resistance. However, susceptibility cannot be equated with plant passivity since active host cooperation may be required for the pathogen to propagate and cause disease. This cooperation consists of the induction of reactions called susceptible responses that transform a plant from an autonomous biological unit into a component of a pathosystem. Induced susceptibility is scarcely discussed in the literature (at least compared to induced resistance) although this phenomenon has a fundamental impact on plant-pathogen interactions and disease progression. This review aims to summarize current knowledge on plant susceptible responses and their regulation. We highlight two main categories of susceptible responses according to their consequences and indicate the relevance of susceptible response-related studies to agricultural practice. We hope that this review will generate interest in this underestimated aspect of plant-pathogen interactions.
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Affiliation(s)
- Vladimir Gorshkov
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center Kazan Scientific Center of Russian Academy of Sciences, Kazan, 420111, Russia.,Laboratory of Plant Infectious Diseases, Federal Research Center Kazan Scientific Center of Russian Academy of Sciences, Kazan, 420111, Russia
| | - Ivan Tsers
- Laboratory of Plant Infectious Diseases, Federal Research Center Kazan Scientific Center of Russian Academy of Sciences, Kazan, 420111, Russia
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20
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Bi G, Zhou JM. Regulation of Cell Death and Signaling by Pore-Forming Resistosomes. ANNUAL REVIEW OF PHYTOPATHOLOGY 2021; 59:239-263. [PMID: 33957051 DOI: 10.1146/annurev-phyto-020620-095952] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Nucleotide-binding leucine-rich repeat receptors (NLRs) are the largest class of immune receptors in plants. They play a key role in the plant surveillance system by monitoring pathogen effectors that are delivered into the plant cell. Recent structural biology and biochemical analyses have uncovered how NLRs are activated to form oligomeric resistosomes upon the recognition of pathogen effectors. In the resistosome, the signaling domain of the NLR is brought to the center of a ringed structure to initiate immune signaling and regulated cell death (RCD). The N terminus of the coiled-coil (CC) domain of the NLR protein HOPZ-ACTIVATED RESISTANCE 1 likely forms a pore in the plasma membrane to trigger RCD in a way analogous to animal pore-forming proteins that trigger necroptosis or pyroptosis. NLRs that carry TOLL-INTERLEUKIN1-RECEPTOR as a signaling domain may also employ pore-forming resistosomes for RCD execution. In addition, increasing evidence supports intimate connections between NLRs and surface receptors in immune signaling. These new findings are rapidly advancing our understanding of the plant immune system.
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Affiliation(s)
- Guozhi Bi
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Innovation Academy for Seed Design, Chinese Academy of Sciences, Beijing 100101, China;
| | - Jian-Min Zhou
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Innovation Academy for Seed Design, Chinese Academy of Sciences, Beijing 100101, China;
- CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing 100049, China
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21
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Tucker JR, Legge WG, Maiti S, Hiebert CW, Simsek S, Yao Z, Xu W, Badea A, Fernando WGD. Transcriptome Alterations of an in vitro-Selected, Moderately Resistant, Two-Row Malting Barley in Response to 3ADON, 15ADON, and NIV Chemotypes of Fusarium graminearum. FRONTIERS IN PLANT SCIENCE 2021; 12:701969. [PMID: 34456945 PMCID: PMC8385242 DOI: 10.3389/fpls.2021.701969] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 07/05/2021] [Indexed: 06/01/2023]
Abstract
Fusarium head blight caused by Fusarium graminearum is a devastating disease of malting barley. Mycotoxins associated with contaminated grain can be transferred from malt to beer and pose a health risk to consumers. In western Canada, F. graminearum has undergone an adaptive shift from 15ADON constituency to dominance by virulent 3ADON-producers; likewise, NIV-producers have established in regions of southern United States. Lack of adapted resistance sources with adequate malting quality has promoted the use of alternative breeding methodologies, such as in vitro selection. We studied the low-deoxynivalenol characteristic of in vitro selected, two-row malting barley variety "Norman" by RNAseq in contrast to its parental line "CDC Kendall," when infected by 15ADON-, 3ADON-, and NIV-producing isolates of F. graminearum. The current study documents higher mycotoxin accumulation by 3ADON isolates, thereby representing increased threat to barley production. At 72-96-h post infection, significant alterations in transcription patterns were observed in both varieties with pronounced upregulation of the phenylpropanoid pathway and detoxification gene categories (UGT, GST, CyP450, and ABC), particularly in 3ADON treatment. Defense response was multitiered, where differential expression in "Norman" associated with antimicrobial peptides (thionin 2.1, defensing, non-specific lipid-transfer protein) and stress-related proteins, such as late embryogenesis abundant proteins, heat-shock, desiccation related, and a peroxidase (HvPrx5). Several gene targets identified in "Norman" would be useful for application of breeding varieties with reduced deoxynivalenol content.
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Affiliation(s)
- James R. Tucker
- Department of Plant Science, University of Manitoba, Winnipeg, MB, Canada
- Brandon Research and Development Centre, Agriculture and Agri-Food Canada, Brandon, MB, Canada
| | - William G. Legge
- Brandon Research and Development Centre, Agriculture and Agri-Food Canada, Brandon, MB, Canada
| | - Sujit Maiti
- Department of Plant Science, University of Manitoba, Winnipeg, MB, Canada
- Brandon Research and Development Centre, Agriculture and Agri-Food Canada, Brandon, MB, Canada
| | - Colin W. Hiebert
- Morden Research and Development Centre, Agriculture and Agri-Food Canada, Morden, MB, Canada
| | - Senay Simsek
- Department of Plant Science, North Dakota State University, Fargo, ND, United States
| | - Zhen Yao
- Morden Research and Development Centre, Agriculture and Agri-Food Canada, Morden, MB, Canada
| | - Wayne Xu
- Morden Research and Development Centre, Agriculture and Agri-Food Canada, Morden, MB, Canada
| | - Ana Badea
- Department of Plant Science, University of Manitoba, Winnipeg, MB, Canada
- Brandon Research and Development Centre, Agriculture and Agri-Food Canada, Brandon, MB, Canada
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22
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Jones K, Zhu J, Jenkinson CB, Kim DW, Pfeifer MA, Khang CH. Disruption of the Interfacial Membrane Leads to Magnaporthe oryzae Effector Re-location and Lifestyle Switch During Rice Blast Disease. Front Cell Dev Biol 2021; 9:681734. [PMID: 34222251 PMCID: PMC8248803 DOI: 10.3389/fcell.2021.681734] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 05/13/2021] [Indexed: 11/13/2022] Open
Abstract
To cause the devastating rice blast disease, the hemibiotrophic fungus Magnaporthe oryzae produces invasive hyphae (IH) that are enclosed in a plant-derived interfacial membrane, known as the extra-invasive hyphal membrane (EIHM), in living rice cells. Little is known about when the EIHM is disrupted and how the disruption contributes to blast disease. Here we show that the disruption of the EIHM correlates with the hyphal growth stage in first-invaded susceptible rice cells. Our approach utilized GFP that was secreted from IH as an EIHM integrity reporter. Secreted GFP (sec-GFP) accumulated in the EIHM compartment but appeared in the host cytoplasm when the integrity of the EIHM was compromised. Live-cell imaging coupled with sec-GFP and various fluorescent reporters revealed that the loss of EIHM integrity preceded shrinkage and eventual rupture of the rice vacuole. The vacuole rupture coincided with host cell death, which was limited to the invaded cell with presumed closure of plasmodesmata. We report that EIHM disruption and host cell death are landmarks that delineate three distinct infection phases (early biotrophic, late biotrophic, and transient necrotrophic phases) within the first-invaded cell before reestablishment of biotrophy in second-invaded cells. M. oryzae effectors exhibited infection phase-specific localizations, including entry of the apoplastic effector Bas4 into the host cytoplasm through the disrupted EIHM during the late biotrophic phase. Understanding how infection phase-specific cellular dynamics are regulated and linked to host susceptibility will offer potential targets that can be exploited to control blast disease.
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Affiliation(s)
- Kiersun Jones
- Department of Plant Biology, University of Georgia, Athens, GA, United States
| | - Jie Zhu
- Department of Plant Biology, University of Georgia, Athens, GA, United States
| | - Cory B Jenkinson
- Department of Plant Biology, University of Georgia, Athens, GA, United States
| | - Dong Won Kim
- Department of Plant Biology, University of Georgia, Athens, GA, United States
| | - Mariel A Pfeifer
- Department of Plant Biology, University of Georgia, Athens, GA, United States
| | - Chang Hyun Khang
- Department of Plant Biology, University of Georgia, Athens, GA, United States
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23
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Jiang YT, Yang LH, Ferjani A, Lin WH. Multiple functions of the vacuole in plant growth and fruit quality. MOLECULAR HORTICULTURE 2021; 1:4. [PMID: 37789408 PMCID: PMC10509827 DOI: 10.1186/s43897-021-00008-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Accepted: 04/09/2021] [Indexed: 10/05/2023]
Abstract
Vacuoles are organelles in plant cells that play pivotal roles in growth and developmental regulation. The main functions of vacuoles include maintaining cell acidity and turgor pressure, regulating the storage and transport of substances, controlling the transport and localization of key proteins through the endocytic and lysosomal-vacuolar transport pathways, and responding to biotic and abiotic stresses. Further, proteins localized either in the tonoplast (vacuolar membrane) or inside the vacuole lumen are critical for fruit quality. In this review, we summarize and discuss some of the emerging functions and regulatory mechanisms associated with plant vacuoles, including vacuole biogenesis, vacuole functions in plant growth and development, fruit quality, and plant-microbe interaction, as well as some innovative research technology that has driven advances in the field. Together, the functions of plant vacuoles are important for plant growth and fruit quality. The investigation of vacuole functions in plants is of great scientific significance and has potential applications in agriculture.
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Affiliation(s)
- Yu-Tong Jiang
- Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Joint Center for Single Cell Biology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Lu-Han Yang
- Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Joint Center for Single Cell Biology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Ali Ferjani
- Department of Biology, Tokyo Gakugei University, Koganei-shi, 184-8501, Japan
| | - Wen-Hui Lin
- Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Joint Center for Single Cell Biology, Shanghai Jiao Tong University, Shanghai, 200240, China.
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24
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Dvořák Tomaštíková E, Hafrén A, Trejo-Arellano MS, Rasmussen SR, Sato H, Santos-González J, Köhler C, Hennig L, Hofius D. Polycomb Repressive Complex 2 and KRYPTONITE regulate pathogen-induced programmed cell death in Arabidopsis. PLANT PHYSIOLOGY 2021; 185:2003-2021. [PMID: 33566101 PMCID: PMC8133635 DOI: 10.1093/plphys/kiab035] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 01/08/2021] [Indexed: 05/10/2023]
Abstract
The Polycomb Repressive Complex 2 (PRC2) is well-known for its role in controlling developmental transitions by suppressing the premature expression of key developmental regulators. Previous work revealed that PRC2 also controls the onset of senescence, a form of developmental programmed cell death (PCD) in plants. Whether the induction of PCD in response to stress is similarly suppressed by the PRC2 remained largely unknown. In this study, we explored whether PCD triggered in response to immunity- and disease-promoting pathogen effectors is associated with changes in the distribution of the PRC2-mediated histone H3 lysine 27 trimethylation (H3K27me3) modification in Arabidopsis thaliana. We furthermore tested the distribution of the heterochromatic histone mark H3K9me2, which is established, to a large extent, by the H3K9 methyltransferase KRYPTONITE, and occupies chromatin regions generally not targeted by PRC2. We report that effector-induced PCD caused major changes in the distribution of both repressive epigenetic modifications and that both modifications have a regulatory role and impact on the onset of PCD during pathogen infection. Our work highlights that the transition to pathogen-induced PCD is epigenetically controlled, revealing striking similarities to developmental PCD.
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Affiliation(s)
- Eva Dvořák Tomaštíková
- Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, SE-75007 Uppsala, Sweden
- Present address: Institute of Experimental Botany, Czech Academy of Sciences; Centre of the Region Haná for Biotechnological and Agricultural Research, Šlechtitelů 31, 779 00 Olomouc, Czech Republic
| | - Anders Hafrén
- Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, SE-75007 Uppsala, Sweden
| | - Minerva S Trejo-Arellano
- Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, SE-75007 Uppsala, Sweden
- Present address: Department of Cell and Developmental Biology, John Innes Centre, Norwich NR4 7UH, UK
| | - Sheena Ricafranca Rasmussen
- Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, SE-75007 Uppsala, Sweden
| | - Hikaru Sato
- Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, SE-75007 Uppsala, Sweden
| | - Juan Santos-González
- Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, SE-75007 Uppsala, Sweden
| | - Claudia Köhler
- Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, SE-75007 Uppsala, Sweden
| | - Lars Hennig
- Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, SE-75007 Uppsala, Sweden
| | - Daniel Hofius
- Department of Plant Biology, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, SE-75007 Uppsala, Sweden
- Author for communication:
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25
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Matilla AJ. Cellular oxidative stress in programmed cell death: focusing on chloroplastic 1O 2 and mitochondrial cytochrome-c release. JOURNAL OF PLANT RESEARCH 2021; 134:179-194. [PMID: 33569718 DOI: 10.1007/s10265-021-01259-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 01/28/2021] [Indexed: 06/12/2023]
Abstract
The programmed cell death (PCD) occurs when the targeted cells have fulfilled their task or under conditions as oxidative stress generated by ROS species. Thus, plants have to deal with the singlet oxygen 1O2 produced in chloroplasts. 1O2 is unlikely to act as a primary retrograde signal owing to its high reactivity and short half-life. In addition to its high toxicity, the 1O2 generated under an excess or low excitation energy might also act as a highly versatile signal triggering chloroplast-to-nucleus retrograde signaling (ChNRS) and nuclear reprogramming or cell death. Molecular and biochemical studies with the flu mutant, which accumulates protochlorophyllide in the dark, demonstrated that chloroplastic 1O2-driven EXECUTER-1 (EX1) and EX2 proteins are involved in the 1O2-dependent response. Both EX1 and EX2 are necessary for full suppression of 1O2-induced gene expression. That is, EXECUTER proteolysis via the ATP-dependent zinc protease (FtsH) is an integral part of 1O2-triggered retrograde signaling. The existence of at least two independent ChNRS involving EX1 and β-cyclocitral, and dihydroactinidiolide and OXI1, respectively, seem clear. Besides, this update also focuses on plant PCD and its relation with mitochondrial cytochrome-c (Cytc) release to cytosol. Changes in the dynamics and morphology of mitochondria were shown during the onset of cell death. The mitochondrial damage and translocation of Cytc may be one of the major causes of PCD triggering. Together, this current overview illustrates the complexity of the cellular response to oxidative stress development. A puzzle with the majority of its pieces still not placed.
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Affiliation(s)
- Angel J Matilla
- Departamento de Biología Funcional, Facultad de Farmacia, Universidad de Santiago de Compostela (USC), Campus Vida, 15782, Santiago de Compostela, A Coruña, Spain.
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26
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Dunker F, Oberkofler L, Lederer B, Trutzenberg A, Weiberg A. An Arabidopsis downy mildew non-RxLR effector suppresses induced plant cell death to promote biotroph infection. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:718-732. [PMID: 33063828 PMCID: PMC7853606 DOI: 10.1093/jxb/eraa472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 10/13/2020] [Indexed: 05/11/2023]
Abstract
Our understanding of obligate biotrophic pathogens is limited by lack of knowledge concerning the molecular function of virulence factors. We established Arabidopsis host-induced gene silencing (HIGS) to explore gene functions of Hyaloperonospora arabidopsidis, including CYSTEINE-RICH PROTEIN (HaCR)1, a potential secreted effector gene of this obligate biotrophic pathogen. HaCR1 HIGS resulted in H. arabidopsidis-induced local plant cell death and reduced pathogen reproduction. We functionally characterized HaCR1 by ectopic expression in Nicotiana benthamiana. HaCR1 was capable of inhibiting effector-triggered plant cell death. Consistent with this, HaCR1 expression in N. benthamiana led to stronger disease symptoms caused by the hemibiotrophic oomycete pathogen Phytophthora capsici, but reduced disease symptoms caused by the necrotrophic fungal pathogen Botrytis cinerea. Expressing HaCR1 in transgenic Arabidopsis confirmed higher susceptibility to H. arabidopsidis and to the bacterial hemibiotrophic pathogen Pseudomonas syringae. Increased H. arabidopsidis infection was in accordance with reduced PATHOGENESIS RELATED (PR)1 induction. Expression of full-length HaCR1 was required for its function, which was lost if the signal peptide was deleted, suggesting its site of action in the plant apoplast. This study provides phytopathological and molecular evidence for the importance of this widespread, but largely unexplored class of non-RxLR effectors in biotrophic oomycetes.
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Affiliation(s)
- Florian Dunker
- Faculty of Biology, Genetics, Biocenter Martinsried, LMU Munich, Planegg-Martinsried, Germany
| | - Lorenz Oberkofler
- Faculty of Biology, Genetics, Biocenter Martinsried, LMU Munich, Planegg-Martinsried, Germany
| | - Bernhard Lederer
- Faculty of Biology, Genetics, Biocenter Martinsried, LMU Munich, Planegg-Martinsried, Germany
| | - Adriana Trutzenberg
- Faculty of Biology, Genetics, Biocenter Martinsried, LMU Munich, Planegg-Martinsried, Germany
| | - Arne Weiberg
- Faculty of Biology, Genetics, Biocenter Martinsried, LMU Munich, Planegg-Martinsried, Germany
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27
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Cui Y, Peng Y, Zhang Q, Xia S, Ruan B, Xu Q, Yu X, Zhou T, Liu H, Zeng D, Zhang G, Gao Z, Hu J, Zhu L, Shen L, Guo L, Qian Q, Ren D. Disruption of EARLY LESION LEAF 1, encoding a cytochrome P450 monooxygenase, induces ROS accumulation and cell death in rice. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 105:942-956. [PMID: 33190327 DOI: 10.1111/tpj.15079] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 10/23/2020] [Accepted: 10/28/2020] [Indexed: 05/18/2023]
Abstract
Lesion-mimic mutants (LMMs) provide a valuable tool to reveal the molecular mechanisms determining programmed cell death (PCD) in plants. Despite intensive research, the mechanisms behind PCD and the formation of lesions in various LMMs still remain to be elucidated. Here, we identified a rice (Oryza sativa) LMM, early lesion leaf 1 (ell1), cloned the causal gene by map-based cloning, and verified this by complementation. ELL1 encodes a cytochrome P450 monooxygenase, and the ELL1 protein was located in the endoplasmic reticulum. The ell1 mutant exhibited decreased chlorophyll contents, serious chloroplast degradation, upregulated expression of chloroplast degradation-related genes, and attenuated photosynthetic protein activity, indicating that ELL1 is involved in chloroplast development. RNA sequencing analysis showed that genes related to oxygen binding were differentially expressed in ell1 and wild-type plants; histochemistry and paraffin sectioning results indicated that hydrogen peroxide (H2 O2 ) and callose accumulated in the ell1 leaves, and the cell structure around the lesions was severely damaged, which indicated that reactive oxygen species (ROS) accumulated and cell death occurred in the mutant. TUNEL staining and comet experiments revealed that severe DNA degradation and abnormal PCD occurred in the ell1 mutants, which implied that excessive ROS accumulation may induce DNA damage and ROS-mediated cell death in the mutant. Additionally, lesion initiation in the ell1 mutant was light dependent and temperature sensitive. Our findings revealed that ELL1 affects chloroplast development or function, and that loss of ELL1 function induces ROS accumulation and lesion formation in rice.
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Affiliation(s)
- Yuanjiang Cui
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Youlin Peng
- Rice Research Institute, Southwest University of Science and Technology, Mianyang, 621010, P. R. China
| | - Qiang Zhang
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Saisai Xia
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Banpu Ruan
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Qiankun Xu
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Xiaoqi Yu
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Tingting Zhou
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - He Liu
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Dali Zeng
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Guangheng Zhang
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Zhenyu Gao
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Jiang Hu
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Li Zhu
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Lan Shen
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Longbiao Guo
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Qian Qian
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
| | - Deyong Ren
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, P. R. China
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28
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Saur IML, Hückelhoven R. Recognition and defence of plant-infecting fungal pathogens. JOURNAL OF PLANT PHYSIOLOGY 2021; 256:153324. [PMID: 33249386 DOI: 10.1016/j.jplph.2020.153324] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 11/04/2020] [Accepted: 11/04/2020] [Indexed: 06/12/2023]
Abstract
Attempted infections of plants with fungi result in diverse outcomes ranging from symptom-less resistance to severe disease and even death of infected plants. The deleterious effect on crop yield have led to intense focus on the cellular and molecular mechanisms that explain the difference between resistance and susceptibility. This research has uncovered plant resistance or susceptibility genes that explain either dominant or recessive inheritance of plant resistance with many of them coding for receptors that recognize pathogen invasion. Approaches based on cell biology and phytochemistry have contributed to identifying factors that halt an invading fungal pathogen from further invasion into or between plant cells. Plant chemical defence compounds, antifungal proteins and structural reinforcement of cell walls appear to slow down fungal growth or even prevent fungal penetration in resistant plants. Additionally, the hypersensitive response, in which a few cells undergo a strong local immune reaction, including programmed cell death at the site of infection, stops in particular biotrophic fungi from spreading into surrounding tissue. In this review, we give a general overview of plant recognition and defence of fungal parasites tracing back to the early 20th century with a special focus on Triticeae and on the progress that was made in the last 30 years.
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Affiliation(s)
- Isabel M L Saur
- Max Planck Institute for Plant Breeding Research, Department of Plant-Microbe Interactions, Carl-von-Linné-Weg 10, 50829 Cologne, Germany.
| | - Ralph Hückelhoven
- Phytopathology, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Ramann-Straße 2, 85354 Freising, Germany.
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29
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Thanthrige N, Jain S, Bhowmik SD, Ferguson BJ, Kabbage M, Mundree S, Williams B. Centrality of BAGs in Plant PCD, Stress Responses, and Host Defense. TRENDS IN PLANT SCIENCE 2020; 25:1131-1140. [PMID: 32467063 DOI: 10.1016/j.tplants.2020.04.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 04/08/2020] [Accepted: 04/21/2020] [Indexed: 05/02/2023]
Abstract
Programmed cell death (PCD) is a genetically regulated process for the selective demise of unwanted and damaged cells. Although our understanding of plant PCD pathways has advanced significantly, doubts remain on the extent of conservation of animal apoptosis in plants. At least at the primary sequence level, plants do not encode the regulators of animal apoptosis. Structural analyses have enabled the identification of the B cell lymphoma 2 (Bcl-2)-associated athanogene (BAG) family of co-chaperones in plants. This discovery suggests that some aspects of animal PCD are conserved in plants, while the varied subcellular localization of plant BAGs indicates that they may have evolved distinct functions. Here we review plant BAG proteins, with an emphasis on their roles in the regulation of plant PCD.
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Affiliation(s)
- Nipuni Thanthrige
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Sachin Jain
- Department of Plant Pathology, University of Wisconsin-, Madison, WI 53706, USA
| | - Sudipta Das Bhowmik
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Brett J Ferguson
- School of Agriculture and Food Sciences, University of Queensland, Brisbane, QLD 4072, Australia
| | - Mehdi Kabbage
- Department of Plant Pathology, University of Wisconsin-, Madison, WI 53706, USA
| | - Sagadevan Mundree
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Brett Williams
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, QLD 4000, Australia.
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30
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Boevink PC, Birch PRJ, Turnbull D, Whisson SC. Devastating intimacy: the cell biology of plant-Phytophthora interactions. THE NEW PHYTOLOGIST 2020; 228:445-458. [PMID: 32394464 PMCID: PMC7540312 DOI: 10.1111/nph.16650] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 04/15/2020] [Indexed: 05/07/2023]
Abstract
An understanding of the cell biology underlying the burgeoning molecular genetic and genomic knowledge of oomycete pathogenicity is essential to gain the full context of how these pathogens cause disease on plants. An intense research focus on secreted Phytophthora effector proteins, especially those containing a conserved N-terminal RXLR motif, has meant that most cell biological studies into Phytophthora diseases have focussed on the effectors and their host target proteins. While these effector studies have provided novel insights into effector secretion and host defence mechanisms, there remain many unanswered questions about fundamental processes involved in spore biology, host penetration and haustorium formation and function.
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Affiliation(s)
- Petra C. Boevink
- Cell and Molecular SciencesJames Hutton InstituteErrol RoadInvergowrieDundeeDD2 5DAUK
| | - Paul R. J. Birch
- Cell and Molecular SciencesJames Hutton InstituteErrol RoadInvergowrieDundeeDD2 5DAUK
- Division of Plant SciencesUniversity of DundeeErrol RoadInvergowrieDundeeDD2 5DAUK
| | - Dionne Turnbull
- Division of Plant SciencesUniversity of DundeeErrol RoadInvergowrieDundeeDD2 5DAUK
| | - Stephen C. Whisson
- Cell and Molecular SciencesJames Hutton InstituteErrol RoadInvergowrieDundeeDD2 5DAUK
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Ma J, Yang S, Wang D, Tang K, Feng XX, Feng XZ. Genetic Mapping of a Light-Dependent Lesion Mimic Mutant Reveals the Function of Coproporphyrinogen III Oxidase Homolog in Soybean. FRONTIERS IN PLANT SCIENCE 2020; 11:557. [PMID: 32457787 PMCID: PMC7227399 DOI: 10.3389/fpls.2020.00557] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Accepted: 04/14/2020] [Indexed: 05/30/2023]
Abstract
Lesion mimic mutants provide ideal genetic materials for elucidating the molecular mechanism of cell death and disease resistance. Here, we isolated a Glycine max lesion mimic mutant 2-1 (Gmlmm2-1), which displayed a light-dependent cell death phenotype. Map-based cloning revealed that GmLMM2 encods a coproporphyrinogen III oxidase and participates in tetrapyrrole biosynthesis. Knockout of GmLMM2 led to necrotic spots on developing leaves of CRISPR/Cas9 induced mutants. The GmLMM2 defect decreased the chlorophyll content by disrupting tetrapyrrole biosynthesis and enhanced resistance to Phytophthora sojae. These results suggested that GmLMM2 gene played an important role in the biosynthesis of tetrapyrrole and light-dependent defense in soybeans.
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Affiliation(s)
- Jingjing Ma
- Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Changchun, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Suxin Yang
- Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Changchun, China
| | - Dongmei Wang
- Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Changchun, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Kuanqiang Tang
- Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Changchun, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xing Xing Feng
- Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Changchun, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xian Zhong Feng
- Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Changchun, China
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Dhar N, Caruana J, Erdem I, Subbarao KV, Klosterman SJ, Raina R. The Arabidopsis SENESCENCE-ASSOCIATED GENE 13 Regulates Dark-Induced Senescence and Plays Contrasting Roles in Defense Against Bacterial and Fungal Pathogens. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2020; 33:754-766. [PMID: 32065029 DOI: 10.1094/mpmi-11-19-0329-r] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
SENESCENCE-ASSOCIATED GENE 13 (SAG13) of Arabidopsis is a widely conserved gene of unknown function that has been extensively used as a marker of plant senescence. SAG13 induction occurs during plant cell death processes, including senescence and hypersensitive response, a type of programmed cell death that occurs in response to pathogens. This implies that SAG13 expression is regulated through at least two different signaling pathways affecting these two different processes. Our work highlights a contrasting role for SAG13 in regulating resistance against disease-causing biotrophic bacterial and necrotrophic fungal pathogens with contrasting infection strategies. We provide further evidence that SAG13 is not only induced during oxidative stress but also plays a role in protecting the plant against other stresses. SAG13 is also required for normal seed germination, seedling growth, and anthocyanin accumulation. The work presented here provides evidence for the role of SAG13 in regulating multiple plant processes including senescence, defense, seed germination, and abiotic stress responses. SAG13 is a valuable molecular marker for these processes and is conserved in multiple plant species, and this knowledge has important implications for crop improvement.
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Affiliation(s)
- Nikhilesh Dhar
- Department of Biology, Syracuse University, Syracuse, NY 13210, U.S.A
- Department of Plant Pathology, University of California, Davis, Salinas, CA 93905, U.S.A
| | - Julie Caruana
- Department of Biology, Syracuse University, Syracuse, NY 13210, U.S.A
- ASEE Postdoctoral Fellow, Naval Research Lab, Washington DC 20375, U.S.A
| | - Irmak Erdem
- Department of Biology, Syracuse University, Syracuse, NY 13210, U.S.A
| | - Krishna V Subbarao
- Department of Plant Pathology, University of California, Davis, Salinas, CA 93905, U.S.A
| | | | - Ramesh Raina
- Department of Biology, Syracuse University, Syracuse, NY 13210, U.S.A
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Galsurker O, Diskin S, Duanis-Assaf D, Doron-Faigenboim A, Maurer D, Feygenberg O, Alkan N. Harvesting Mango Fruit with a Short Stem-End Altered Endophytic Microbiome and Reduce Stem-End Rot. Microorganisms 2020; 8:E558. [PMID: 32295088 PMCID: PMC7232454 DOI: 10.3390/microorganisms8040558] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 04/10/2020] [Accepted: 04/11/2020] [Indexed: 02/01/2023] Open
Abstract
Stem-end rot (SER) is a serious postharvest disease of mango fruit grown in semi-dry area. Pathogenic and non-pathogenic microorganisms endophytically colonize fruit stem-end. As fruit ripens, some pathogenic fungi switch from endophytic colonization to necrotrophic stage and cause SER. Various pre/post-treatments may alter the stem-end community and modify SER incidence. This study investigates the effects of harvesting mango with or without short stem-end on fruit antifungal and antioxidant activities, the endophytic microbiome, and SER during fruit storage. Our results show that harvesting mango with short stem significantly reduced SER during storage. At harvest, fruit harvested with or without stem exhibit a similar microorganisms community profile. However, after storage and shelf life, the community of fruit without stem shifted toward more SER-causing-pathogens, such as Lasiodiplodia, Dothiorella, and Alternaria, and separated from the community of fruit with stem. This change correlated to the high antifungal activity of stem extract that strongly inhibited both germination and growth of Lasiodiplodia theobromae and Alternaria alternata. Additionally, fruit that was harvested with stem displayed more antioxidant activity and less ROS. Altogether, these findings indicate that harvesting mango with short stem leads to higher antifungal and antioxidant activity, retaining a healthier microbial community and leading to reduced postharvest SER.
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Affiliation(s)
- Ortal Galsurker
- Department of Postharvest Science of Fresh Produce, Agricultural Research Organization (ARO), Volcani Center, Rishon LeZion 7505101, Israel; (O.G.); (S.D.); (D.D.-A.); (D.M.); (O.F.)
| | - Sonia Diskin
- Department of Postharvest Science of Fresh Produce, Agricultural Research Organization (ARO), Volcani Center, Rishon LeZion 7505101, Israel; (O.G.); (S.D.); (D.D.-A.); (D.M.); (O.F.)
| | - Danielle Duanis-Assaf
- Department of Postharvest Science of Fresh Produce, Agricultural Research Organization (ARO), Volcani Center, Rishon LeZion 7505101, Israel; (O.G.); (S.D.); (D.D.-A.); (D.M.); (O.F.)
| | - Adi Doron-Faigenboim
- Institute of Plant Sciences, Agricultural Research Organization (ARO), Volcani Center, Rishon LeZion 7505101, Israel;
| | - Dalia Maurer
- Department of Postharvest Science of Fresh Produce, Agricultural Research Organization (ARO), Volcani Center, Rishon LeZion 7505101, Israel; (O.G.); (S.D.); (D.D.-A.); (D.M.); (O.F.)
| | - Oleg Feygenberg
- Department of Postharvest Science of Fresh Produce, Agricultural Research Organization (ARO), Volcani Center, Rishon LeZion 7505101, Israel; (O.G.); (S.D.); (D.D.-A.); (D.M.); (O.F.)
| | - Noam Alkan
- Department of Postharvest Science of Fresh Produce, Agricultural Research Organization (ARO), Volcani Center, Rishon LeZion 7505101, Israel; (O.G.); (S.D.); (D.D.-A.); (D.M.); (O.F.)
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Oliva M, Hatan E, Kumar V, Galsurker O, Nisim-Levi A, Ovadia R, Galili G, Lewinsohn E, Elad Y, Alkan N, Oren-Shamir M. Increased phenylalanine levels in plant leaves reduces susceptibility to Botrytis cinerea. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 290:110289. [PMID: 31779900 DOI: 10.1016/j.plantsci.2019.110289] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 09/23/2019] [Accepted: 09/25/2019] [Indexed: 05/26/2023]
Abstract
Botrytis cinerea is a major plant pathogen, causing losses in crops during growth and storage. Here we show that increased accumulation of phenylalanine (Phe) and Phe-derived metabolites in plant leaves significantly reduces their susceptibility to B. cinerea. Arabidopsis, petunia and tomato plants were enriched with Phe by either overexpressing a feedback-insensitive E.coli DAHP synthase (AroG*), or by spraying or drenching detached leaves or whole plants with external Phe, prior to infection with B. cinerea. Metabolic analysis of Arabidopsis and petunia plants overexpressing AroG* as well as wt petunia plants treated externally with Phe, revealed an increase in Phe-derived phenylpropanoids accumulated in their leaves, and specifically in those inhibiting B. cinerea germination and growth, suggesting that different compounds reduce susceptibility to B. cinerea in different plants. Phe itself had no inhibitory effect on germination or growth of B. cinerea, and inhibition of Phe metabolism in petunia plants treated with external Phe prevented decreased susceptibility to the fungus. Thus, Phe metabolism into an array of metabolites, unique to each plant and plant organ, is the most probable cause for increased resistance to Botrytis. This mechanism may provide a basis for ecologically friendly control of a wide range of plant pathogens.
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Affiliation(s)
- Moran Oliva
- Department of Ornamental Plants and Agricultural Biotechnology, Agricultural Research Organization, Volcani Center, 68 HaMaccabim Road, P.O.B 15159, Rishon LeZion, 7505101, Israel; Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Erel Hatan
- Department of Ornamental Plants and Agricultural Biotechnology, Agricultural Research Organization, Volcani Center, 68 HaMaccabim Road, P.O.B 15159, Rishon LeZion, 7505101, Israel
| | - Varun Kumar
- Department of Ornamental Plants and Agricultural Biotechnology, Agricultural Research Organization, Volcani Center, 68 HaMaccabim Road, P.O.B 15159, Rishon LeZion, 7505101, Israel
| | - Ortal Galsurker
- Department of Postharvest Science, Agricultural Research Organization, Volcani Center, 68 HaMaccabim Road, P.O.B 15159, Rishon LeZion, 7505101, Israel
| | - Ada Nisim-Levi
- Department of Ornamental Plants and Agricultural Biotechnology, Agricultural Research Organization, Volcani Center, 68 HaMaccabim Road, P.O.B 15159, Rishon LeZion, 7505101, Israel
| | - Rinat Ovadia
- Department of Ornamental Plants and Agricultural Biotechnology, Agricultural Research Organization, Volcani Center, 68 HaMaccabim Road, P.O.B 15159, Rishon LeZion, 7505101, Israel
| | - Gad Galili
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Efraim Lewinsohn
- Department of Vegetable Crops, Agriculture Research Organization, Newe Ya'ar Research Center, Volcani Center, Ramat Yishay, 30095, Israel
| | - Yigal Elad
- Department of Plant Pathology and Weed Research, Agricultural Research Organization, The Volcani Center, 68 HaMaccabim Road, P.O.B 15159, Rishon LeZion, 7505101, Israel
| | - Noam Alkan
- Department of Postharvest Science, Agricultural Research Organization, Volcani Center, 68 HaMaccabim Road, P.O.B 15159, Rishon LeZion, 7505101, Israel
| | - Michal Oren-Shamir
- Department of Ornamental Plants and Agricultural Biotechnology, Agricultural Research Organization, Volcani Center, 68 HaMaccabim Road, P.O.B 15159, Rishon LeZion, 7505101, Israel.
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Qi F, Zhang L, Dong X, Di H, Zhang J, Yao M, Dong L, Zeng X, Liu X, Wang Z, Zhou Y. Analysis of Cytology and Expression of Resistance Genes in Maize Infected with Sporisorium reilianum. PLANT DISEASE 2019; 103:2100-2107. [PMID: 31215852 DOI: 10.1094/pdis-09-18-1687-re] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Head smut, caused by the fungus Sporisorium reilianum, is a devastating global disease of maize (Zea mays). In the present study, maize seedlings were artificially inoculated with compatible mating-type strains of S. reilianum by needle inoculation of mesocotyls (NIM) or by soaking inoculation of radicles (SIR). After NIM or SIR, Huangzao4 mesocotyls exhibited severe damage with brownish discoloration and necrosis, whereas Mo17 mesocotyls exhibited few lesions. Fluorescence and electron microscopy showed that S. reilianum infected maize within 0.5 day after SIR and mainly colonized the phloem. With longer incubation, the density of S. reilianum hyphae increased in the vascular bundles, concentrated mainly in the phloem. In Mo17, infected cells exhibited apoptosis-like features, and hyphae became sequestered within dead cells. In contrast, in Huangzao4, pathogen invasion resulted in autophagy that failed to prevent hyphal spreading. The growth of S. reilianum hyphae diminished at 6 days after inoculation when expression of the R genes ZmWAK and ZmNL peaked. Thus, 6 days after SIR inoculation might be an important time for inhibiting the progress of S. reilianum infection in maize. The results of this study will provide a basis for further analysis of the mechanisms of maize resistance to S. reilianum.
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Affiliation(s)
- Fengkun Qi
- Northeast Agricultural University, Changjiang Road, Xiangfang District, Harbin, Heilongjiang Province, China 150030
| | - Lin Zhang
- Northeast Agricultural University, Changjiang Road, Xiangfang District, Harbin, Heilongjiang Province, China 150030
| | - Xiaojie Dong
- Northeast Agricultural University, Changjiang Road, Xiangfang District, Harbin, Heilongjiang Province, China 150030
| | - Hong Di
- Northeast Agricultural University, Changjiang Road, Xiangfang District, Harbin, Heilongjiang Province, China 150030
| | - Jiayue Zhang
- Northeast Agricultural University, Changjiang Road, Xiangfang District, Harbin, Heilongjiang Province, China 150030
| | - Minhao Yao
- Northeast Agricultural University, Changjiang Road, Xiangfang District, Harbin, Heilongjiang Province, China 150030
| | - Ling Dong
- Northeast Agricultural University, Changjiang Road, Xiangfang District, Harbin, Heilongjiang Province, China 150030
| | - Xing Zeng
- Northeast Agricultural University, Changjiang Road, Xiangfang District, Harbin, Heilongjiang Province, China 150030
| | - Xianjun Liu
- Northeast Agricultural University, Changjiang Road, Xiangfang District, Harbin, Heilongjiang Province, China 150030
| | - Zhenhua Wang
- Northeast Agricultural University, Changjiang Road, Xiangfang District, Harbin, Heilongjiang Province, China 150030
| | - Yu Zhou
- Northeast Agricultural University, Changjiang Road, Xiangfang District, Harbin, Heilongjiang Province, China 150030
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Kanyuka K, Rudd JJ. Cell surface immune receptors: the guardians of the plant's extracellular spaces. CURRENT OPINION IN PLANT BIOLOGY 2019; 50:1-8. [PMID: 30861483 PMCID: PMC6731392 DOI: 10.1016/j.pbi.2019.02.005] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 02/01/2019] [Accepted: 02/07/2019] [Indexed: 05/18/2023]
Abstract
Since the original 'Zigzag model', several iterations have been proposed to reconcile both the Pattern Triggered Immunity (PTI) and the Effector Triggered Immunity (ETI) branches of the plant immune system. The recent cloning of new disease resistance genes, functioning in gene-for-gene interactions, which structurally resemble cell surface broad spectrum Pattern Recognition Receptors, have further blurred the distinctions between PTI and ETI in plant immunity. In an attempt to simplify further the existing conceptual models, we, herein, propose a scheme based on the spatial localization of the key proteins (receptors) which function to induce plant immune responses. We believe this 'Spatial Invasion model' will prove useful for understanding how immune receptors interact with different pathogen types which peripherally or totally invade plant cells, colonize solely extracellularly or switch locations during a successful infection.
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Affiliation(s)
- Kostya Kanyuka
- Biointeractions and Crop Protection, Rothamsted Research, Harpenden, United Kingdom.
| | - Jason J Rudd
- Biointeractions and Crop Protection, Rothamsted Research, Harpenden, United Kingdom
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Im SH, Klochkova TA, Lee DJ, Gachon CMM, Kim GH. Genetic toolkits of the red alga Pyropia tenera against the three most common diseases in Pyropia farms. JOURNAL OF PHYCOLOGY 2019; 55:801-815. [PMID: 30897208 DOI: 10.1111/jpy.12857] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Accepted: 02/18/2019] [Indexed: 06/09/2023]
Abstract
Disease outbreaks devastate Pyropia aquaculture farms every year. The three most common and serious diseases are Olpidiopsis-blight and red-rot disease caused by oomycete pathogens and green-spot disease caused by the PyroV1 virus. We hypothesized that a basic genetic profile of molecular defenses will be revealed by comparing and analyzing the genetic response of Pyropia tenera against the above three pathogens. RNAs isolated from infected thalli were hybridized onto an oligochip containing 15,115 primers designed from P. tenera expressed sequence tags (EST)s. Microarray profiles of the three diseases were compared and interpreted together with histochemical observation. Massive amounts of reactive oxygen species accumulated in P. tenera cells exposed to oomycete pathogens. Heat shock genes and serine proteases were the most highly up-regulated genes in all infection experiments. Genes involved in RNA metabolism, ribosomal proteins and antioxidant metabolism were also highly up-regulated. Genetic profiles of P. tenera in response to pathogens were most similar between the two biotrophic pathogens, Olpidiopsis pyropiae and PyroV1 virus. A group of plant resistance genes were specifically regulated against each pathogen. Our results suggested that disease response in P. tenera consists of a general constitutive defense and a genetic toolkit against specific pathogens.
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Affiliation(s)
- Soo Hyun Im
- Department of Biology, Kongju National University, Kongju, 32588, Republic of Korea
| | - Tatyana A Klochkova
- Department of Biology, Kongju National University, Kongju, 32588, Republic of Korea
| | - Da Jeoung Lee
- Department of Biology, Kongju National University, Kongju, 32588, Republic of Korea
| | - Claire M M Gachon
- Scottish Association for Marine Science, Scottish Marine Institute, Oban, PA37 1QA, UK
| | - Gwang Hoon Kim
- Department of Biology, Kongju National University, Kongju, 32588, Republic of Korea
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Ma C, Li B, Wang L, Xu ML, Lizhu E, Jin H, Wang Z, Ye JR. Characterization of phytohormone and transcriptome reprogramming profiles during maize early kernel development. BMC PLANT BIOLOGY 2019; 19:197. [PMID: 31088353 PMCID: PMC6515667 DOI: 10.1186/s12870-019-1808-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 04/26/2019] [Indexed: 05/23/2023]
Abstract
BACKGROUND During maize early kernel development, the dramatic transcriptional reprogramming determines the rate of developmental progression, and phytohormone plays critical role in these important processes. To investigate the phytohormone levels and transcriptome reprogramming profiles during maize early kernel development, two maize inbreds with similar genetic background but different mature kernel sizes (ILa and ILb) were used. RESULTS The levels of indole-3-acetic acid (IAA) were increased continuously in maize kernels from 5 days after pollination (DAP) to 10 DAP. ILa had smaller mature kernels than ILb, and ILa kernels had significantly lower IAA levels and significantly higher SA levels than ILb at 10 DAP. The different phytohormone profiles correlated with different transcriptional reprogramming in the two kernels. The global transcriptomes in ILa and ILb kernels were strikingly different at 5 DAP, and their differences peaked at 8 DAP. Functional analysis showed that the biggest transcriptome difference between the two kernels is those response to biotic and abiotic stresses. Further analyses indicated that the start of dramatic transcriptional reprogramming and the onset of significantly enriched functional categories, especially the "plant hormone signal transduction" and "starch and sucrose metabolism", was earlier in ILa than in ILb, whereas more significant enrichment of those functional categories occurred at later stage of kernel development in ILb. CONCLUSIONS These results indicate that later onset of the significantly enriched functional categories, coincide with their stronger activities at a later developmental stage and higher IAA level, are necessary for young kernels to undergo longer mitotic activity and finally develop a larger kernel size. The different onset times and complex interactions of the important functional categories, especially phytohormone signal, and carbohydrate metabolism, form the most important molecular regulators mediating maize early kernel development.
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Affiliation(s)
- Chuanyu Ma
- National Maize Improvement Center, China Agricultural University, 2 West Yuanmingyuan Road, Beijing, 100193 People’s Republic of China
| | - Bo Li
- National Maize Improvement Center, China Agricultural University, 2 West Yuanmingyuan Road, Beijing, 100193 People’s Republic of China
| | - Lina Wang
- National Maize Improvement Center, China Agricultural University, 2 West Yuanmingyuan Road, Beijing, 100193 People’s Republic of China
| | - Ming-liang Xu
- National Maize Improvement Center, China Agricultural University, 2 West Yuanmingyuan Road, Beijing, 100193 People’s Republic of China
| | - E. Lizhu
- National Maize Improvement Center, China Agricultural University, 2 West Yuanmingyuan Road, Beijing, 100193 People’s Republic of China
| | - Hongyu Jin
- National Maize Improvement Center, China Agricultural University, 2 West Yuanmingyuan Road, Beijing, 100193 People’s Republic of China
| | - Zhicheng Wang
- National Maize Improvement Center, China Agricultural University, 2 West Yuanmingyuan Road, Beijing, 100193 People’s Republic of China
| | - Jian-rong Ye
- National Maize Improvement Center, China Agricultural University, 2 West Yuanmingyuan Road, Beijing, 100193 People’s Republic of China
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Pokou DN, Fister AS, Winters N, Tahi M, Klotioloma C, Sebastian A, Marden JH, Maximova SN, Guiltinan MJ. Resistant and susceptible cacao genotypes exhibit defense gene polymorphism and unique early responses to Phytophthora megakarya inoculation. PLANT MOLECULAR BIOLOGY 2019; 99:499-516. [PMID: 30739243 DOI: 10.1007/s11103-019-00832-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 01/24/2019] [Indexed: 05/26/2023]
Abstract
Key genes potentially involved in cacao disease resistance were identified by transcriptomic analysis of important cacao cultivars. Defense gene polymorphisms were identified which could contribute to pathogen recognition capacity. Cacao suffers significant annual losses to the water mold Phytophthora spp. (Oomycetes). In West Africa, P. megakarya poses a major threat to farmer livelihood and the stability of cocoa production. As part of a long-term goal to define key disease resistance genes in cacao, here we use a transcriptomic analysis of the disease-resistant cacao clone SCA6 and the susceptible clone NA32 to characterize basal differences in gene expression, early responses to infection, and polymorphisms in defense genes. Gene expression measurements by RNA-seq along a time course revealed the strongest transcriptomic response 24 h after inoculation in the resistant genotype. We observed strong regulation of several pathogenesis-related genes, pattern recognition receptors, and resistance genes, which could be critical for the ability of SCA6 to combat infection. These classes of genes also showed differences in basal expression between the two genotypes prior to infection, suggesting that prophylactic expression of defense-associated genes could contribute to SCA6's broad-spectrum disease resistance. Finally, we analyzed polymorphism in a set of defense-associated receptors, identifying coding variants between SCA6 and NA32 which could contribute to unique capacities for pathogen recognition. This work is an important step toward characterizing genetic differences underlying a successful defense response in cacao.
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Affiliation(s)
- Désiré N Pokou
- Centre National de Recherche Agronomique, Laboratoire Central de Biotechnologie, 01 BP 1740, Abidjan 01, Côte d'Ivoire
| | - Andrew S Fister
- Department of Plant Sciences, Life Sciences Building, Pennsylvania State University, University Park, PA, 16802, USA
| | - Noah Winters
- Intercollege Graduate Degree Program in Ecology, Pennsylvania State University, University Park, PA, 16802, USA
- The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Mathias Tahi
- Centre National de Recherche Agronomique, Laboratoire Central de Biotechnologie, 01 BP 1740, Abidjan 01, Côte d'Ivoire
| | - Coulibaly Klotioloma
- Centre National de Recherche Agronomique, Laboratoire Central de Biotechnologie, 01 BP 1740, Abidjan 01, Côte d'Ivoire
| | - Aswathy Sebastian
- The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, 16802, USA
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA, 16802, USA
| | - James H Marden
- The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, 16802, USA
- Department of Biology, Pennsylvania State University, University Park, PA, 16802, USA
| | - Siela N Maximova
- Department of Plant Sciences, Life Sciences Building, Pennsylvania State University, University Park, PA, 16802, USA
- The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Mark J Guiltinan
- Department of Plant Sciences, Life Sciences Building, Pennsylvania State University, University Park, PA, 16802, USA.
- The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, 16802, USA.
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Höwing T, Dann M, Müller B, Helm M, Scholz S, Schneitz K, Hammes UZ, Gietl C. The role of KDEL-tailed cysteine endopeptidases of Arabidopsis (AtCEP2 and AtCEP1) in root development. PLoS One 2018; 13:e0209407. [PMID: 30576358 PMCID: PMC6303060 DOI: 10.1371/journal.pone.0209407] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 12/05/2018] [Indexed: 12/17/2022] Open
Abstract
Plants encode a unique group of papain-type cysteine endopeptidases (CysEP) characterized by a C-terminal KDEL endoplasmic reticulum retention signal (KDEL-CysEP) and an unusually broad substrate specificity. The three Arabidopsis KDEL-CysEPs (AtCEP1, AtCEP2, and AtCEP3) are differentially expressed in vegetative and generative tissues undergoing programmed cell death (PCD). While KDEL-CysEPs have been shown to be implicated in the collapse of tissues during PCD, roles of these peptidases in processes other than PCD are unknown. Using mCherry-AtCEP2 and EGFP-AtCEP1 reporter proteins in wild type versus atcep2 or atcep1 mutant plants, we explored the participation of AtCEP in young root development. Loss of AtCEP2, but not AtCEP1 resulted in shorter primary roots due to a decrease in cell length in the lateral root (LR) cap, and impairs extension of primary root epidermis cells such as trichoblasts in the elongation zone. AtCEP2 was localized to root cap corpses adherent to epidermal cells in the rapid elongation zone. AtCEP1 and AtCEP2 are expressed in root epidermis cells that are separated for LR emergence. Loss of AtCEP1 or AtCEP2 caused delayed emergence of LR primordia. KDEL-CysEPs might be involved in developmental tissue remodeling by supporting cell wall elongation and cell separation.
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Affiliation(s)
- Timo Höwing
- Lehrstuhl für Botanik, Center of Life and Food Sciences Weihenstephan, Technische Universitaet Muenchen, Freising, Germany
| | - Marcel Dann
- Lehrstuhl für Botanik, Center of Life and Food Sciences Weihenstephan, Technische Universitaet Muenchen, Freising, Germany
| | - Benedikt Müller
- Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of Regensburg, Regensburg, Germany
| | - Michael Helm
- Lehrstuhl für Botanik, Center of Life and Food Sciences Weihenstephan, Technische Universitaet Muenchen, Freising, Germany
| | - Sebastian Scholz
- Plant Developmental Biology, Center of Life and Food Sciences Weihenstephan, Technische Universitaet Muenchen, Freising, Germany
| | - Kay Schneitz
- Plant Developmental Biology, Center of Life and Food Sciences Weihenstephan, Technische Universitaet Muenchen, Freising, Germany
| | - Ulrich Z. Hammes
- Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of Regensburg, Regensburg, Germany
| | - Christine Gietl
- Lehrstuhl für Botanik, Center of Life and Food Sciences Weihenstephan, Technische Universitaet Muenchen, Freising, Germany
- * E-mail:
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41
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Heterologous Expression of the Grapevine JAZ7 Gene in Arabidopsis Confers Enhanced Resistance to Powdery Mildew but Not to Botrytis cinerea. Int J Mol Sci 2018; 19:ijms19123889. [PMID: 30563086 PMCID: PMC6321488 DOI: 10.3390/ijms19123889] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2018] [Revised: 11/25/2018] [Accepted: 11/30/2018] [Indexed: 12/17/2022] Open
Abstract
Jasmonate ZIM-domain (JAZ) family proteins comprise a class of transcriptional repressors that silence jasmonate-inducible genes. Although a considerable amount of research has been carried out on this gene family, there is still very little information available on the role of specific JAZ gene members in multiple pathogen resistance, especially in non-model species. In this study, we investigated the potential resistance function of the VqJAZ7 gene from a disease-resistant wild grapevine, Vitis quinquangularis cv. “Shang-24”, through heterologous expression in Arabidopsis thaliana. VqJAZ7-expressing transgenic Arabidopsis were challenged with three pathogens: the biotrophic fungus Golovinomyces cichoracearum, necrotrophic fungus Botrytis cinerea, and semi-biotrophic bacteria Pseudomonas syringae pv. tomato DC3000. We found that plants expressing VqJAZ7 showed greatly reduced disease symptoms for G. cichoracearum, but not for B. cinerea or P. syringae. In response to G cichoracearum infection, VqJAZ7-expressing transgenic lines exhibited markedly higher levels of cell death, superoxide anions (O2¯, and H2O2 accumulation, relative to nontransgenic control plants. Moreover, we also tested the relative expression of defense-related genes to comprehend the possible induced pathways. Taken together, our results suggest that VqJAZ7 in grapevine participates in molecular pathways of resistance to G. cichoracearum, but not to B. cinerea or P. syringae.
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Yu Y, Shi J, Li X, Liu J, Geng Q, Shi H, Ke Y, Sun Q. Transcriptome analysis reveals the molecular mechanisms of the defense response to gray leaf spot disease in maize. BMC Genomics 2018; 19:742. [PMID: 30305015 PMCID: PMC6180411 DOI: 10.1186/s12864-018-5072-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Accepted: 09/11/2018] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Gray leaf spot (GLS), which is caused by the necrotrophic fungi Cercospora zeae-maydis and Cercospora zeina, is one of the most impactful diseases in maize worldwide. The aim of the present study is to identify the resistance genes and understand the molecular mechanisms for GLS resistance. RESULTS Two cultivars, 'Yayu889' and 'Zhenghong532,' which are distinguished as resistant and susceptible cultivars, respectively, were challenged with the GLS disease and a RNA-seq experiment was conducted on infected plants at 81, 89, 91, and 93 days post planting (dap). Compared with the beginning stage at 81 dap, 4666, 1733, and 1166 differentially expressed genes (DEGs) were identified at 89, 91, and 93 dap, respectively, in 'Yayu889,' while relatively fewer, i.e., 4713, 881, and 722 DEGs, were identified in 'Zhenghong532.' Multiple pathways involved in the response of maize to GLS, including 'response to salicylic acid,' 'protein phosphorylation,' 'oxidation-reduction process,' and 'carotenoid biosynthetic process,' were enriched by combining differential expression analysis and Weighted Gene Co-expression Network Analysis (WGCNA). The expression of 12 candidate resistance proteins in these pathways were quantified by the multiple reaction monitoring (MRM) method. This approach identified two candidate resistance proteins, a calmodulin-like protein and a leucine-rich repeat receptor-like protein kinase with SNPs that were located in QTL regions for GLS resistance. Metabolic analysis showed that, compared with 'Zhenghong532,' the amount of salicylic acid (SA) and total carotenoids in 'Yayu889' increased, while peroxidase activity decreased during the early infection stages, suggesting that increased levels of SA, carotenoids, and reactive oxygen species (ROS) may enhance the defense response of 'Yayu889' to GLS. CONCLUSION By combining transcriptome and proteome analyses with comparisons of resistance QTL regions, calmodulin-like protein and leucine-rich repeat receptor-like protein kinase were identified as candidate GLS resistance proteins. Moreover, we found that the metabolic pathways for ROS, SA, and carotenoids are especially active in the resistant cultivar. These findings could lead to a better understanding of the GLS resistance mechanisms and facilitate the breeding of GLS-resistant maize cultivars.
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Affiliation(s)
- Yang Yu
- Key Laboratory of Bio-resources and Eco-environment of the Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, People’s Republic of China
| | - Jianyang Shi
- Key Laboratory of Bio-resources and Eco-environment of the Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, People’s Republic of China
| | - Xiyang Li
- Key Laboratory of Bio-resources and Eco-environment of the Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, People’s Republic of China
| | - Jian Liu
- Key Laboratory of Bio-resources and Eco-environment of the Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, People’s Republic of China
| | - Qi Geng
- Key Laboratory of Bio-resources and Eco-environment of the Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, People’s Republic of China
| | - Haichun Shi
- Agronomy College, Sichuan Agriculture University, Chengdu, Sichuan People’s Republic of China
| | - Yongpei Ke
- Agronomy College, Sichuan Agriculture University, Chengdu, Sichuan People’s Republic of China
| | - Qun Sun
- Key Laboratory of Bio-resources and Eco-environment of the Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, People’s Republic of China
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Xu L, Li G, Jiang D, Chen W. Sclerotinia sclerotiorum: An Evaluation of Virulence Theories. ANNUAL REVIEW OF PHYTOPATHOLOGY 2018; 56:311-338. [PMID: 29958073 DOI: 10.1146/annurev-phyto-080417-050052] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Oxalic acid production in Sclerotinia sclerotiorum has long been associated with virulence. Research involving UV-induced, genetically undefined mutants that concomitantly lost oxalate accumulation, sclerotial formation, and pathogenicity supported the conclusion that oxalate is an essential pathogenicity determinant of S. sclerotiorum. However, recent investigations showed that genetically defined mutants that lost oxalic acid production but accumulated fumaric acid could cause disease on many plants and substantiated the conclusion that acidic pH, not oxalic acid per se, is the necessary condition for disease development. Critical evaluation of available evidence showed that the UV-induced mutants harbored previously unrecognized confounding genetic defects in saprophytic growth and pH responsiveness, warranting reevaluation of the conclusions about virulence based on the UV-induced mutants. Furthermore, analyses of the evidence suggested a hypothesis for the existence of an unrecognized regulator responsive to acidic pH. Identifying the unknown pH regulator would offer a new avenue for investigating pH sensing/regulation in S. sclerotiorum and novel targets for intervention in disease control strategies.
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Affiliation(s)
- Liangsheng Xu
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, People's Republic of China
| | - Guoqing Li
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
- The Provincial Key Lab of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
| | - Daohong Jiang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
- The Provincial Key Lab of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
| | - Weidong Chen
- Grain Legume Genetics and Physiology Research Unit, US Department of Agriculture, Agricultural Research Service, Washington State University, Pullman, Washington 99164, USA
- Departments of Plant Pathology and Molecular Plant Sciences Program, Washington State University, Pullman, Washington 99164, USA;
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44
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Lv Z, Huang Y, Ma B, Xiang Z, He N. LysM1 in MmLYK2 is a motif required for the interaction of MmLYP1 and MmLYK2 in the chitin signaling. PLANT CELL REPORTS 2018; 37:1101-1112. [PMID: 29846768 DOI: 10.1007/s00299-018-2295-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Accepted: 05/12/2018] [Indexed: 05/27/2023]
Abstract
Two LysM-containing proteins, namely, MmLYP1 and MmLYK2, were identified in mulberry. These proteins might be involved in chitin signaling. The LysM1 of MmLYK2 is critical for their interactions. Chitin is a major component of fungal cell walls and acts as an elicitor in plant innate immunity. Lysin motif (LysM)-containing proteins are essential for chitin recognition. However, related studies have been rarely reported in woody plants. In this study, in mulberry, the expression of a LysM-containing protein, MmLYP1, was significantly up-regulated after treatment with chitin and pathogenic fungi. In addition, MmLYP1 has an affinity for insoluble chitin polymers. Thus, MmLYP1 might function in chitin signaling. Since MmLYP1 lacks an intracellular domain, additional protein kinases are required for this signaling. An LysM-containing kinase, MmLYK2, was then identified. Expression of the MmLYK2 did not change significantly after chitin treatment, and the affinity of MmLYK2 for insoluble chitin was not high. The structure of MmLYP1 is similar to that of the chitin elicitor-binding proteins in rice and Arabidopsis. However, MmLYK2 has two LysM motifs, while the chitin elicitor receptor kinase 1 proteins in rice and Arabidopsis have one and three LysM motifs, respectively. The LysM1 of MmLYK2 interacted with all four LysM motifs in MmLYP1 and MmLYK2 in yeast. The chimera lacking the LysM1 of MmLYK2 did not interact with MmLYP1 and MmLYK2 in yeast and Nicotiana benthamiana cells. The LysM1 in MmLYK2 is the key motif in the interaction between MmLYP1 and MmLYK2, which may be involved in chitin signaling.
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Affiliation(s)
- Zhiyuan Lv
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Yan Huang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Bi Ma
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Zhonghuai Xiang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Ningjia He
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China.
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45
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Zhang X, Zhao M, Yan J, Yang L, Yang Y, Guan W, Walcott R, Zhao T. Involvement of hrpX and hrpG in the Virulence of Acidovorax citrulli Strain Aac5, Causal Agent of Bacterial Fruit Blotch in Cucurbits. Front Microbiol 2018; 9:507. [PMID: 29636729 PMCID: PMC5880930 DOI: 10.3389/fmicb.2018.00507] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Accepted: 03/06/2018] [Indexed: 01/01/2023] Open
Abstract
Acidovorax citrulli causes bacterial fruit blotch, a disease that poses a global threat to watermelon and melon production. Despite its economic importance, relatively little is known about the molecular mechanisms of pathogenicity and virulence of A. citrulli. Like other plant-pathogenic bacteria, A. citrulli relies on a type III secretion system (T3SS) for pathogenicity. On the basis of sequence and operon arrangement analyses, A. citrulli was found to have a class II hrp gene cluster similar to those of Xanthomonas and Ralstonia spp. In the class II hrp cluster, hrpG and hrpX play key roles in the regulation of T3SS effectors. However, little is known about the regulation of the T3SS in A. citrulli. This study aimed to investigate the roles of hrpG and hrpX in A. citrulli pathogenicity. We found that hrpG or hrpX deletion mutants of the A. citrulli group II strain Aac5 had reduced pathogenicity on watermelon seedlings, failed to induce a hypersensitive response in tobacco, and elicited higher levels of reactive oxygen species in Nicotiana benthamiana than the wild-type strain. Additionally, we demonstrated that HrpG activates HrpX in A. citrulli. Moreover, transcription and translation of the type 3-secreted effector (T3E) gene Aac5_2166 were suppressed in hrpG and hrpX mutants. Notably, hrpG and hrpX appeared to modulate biofilm formation. These results suggest that hrpG and hrpX are essential for pathogenicity, regulation of T3Es, and biofilm formation in A. citrulli.
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Affiliation(s)
- Xiaoxiao Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Mei Zhao
- Department of Plant Pathology, University of Georgia, Athens, GA, United States
| | - Jianpei Yan
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China.,Faculty of Agronomy, Jilin Agricultural University, Changchun, China
| | - Linlin Yang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China.,Plant Protection College, Shenyang Agricultural University, Shenyang, China
| | - Yuwen Yang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Wei Guan
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Ron Walcott
- Department of Plant Pathology, University of Georgia, Athens, GA, United States
| | - Tingchang Zhao
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
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46
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Abstract
The fungal pathogen Magnaporthe oryzae causes severe disease symptoms and yield losses on rice plants. A new study shows that this fungus elicits disease lesions by co-opting a host protein and reveals how rice plants fight back.
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47
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Zhao Y, Luo L, Xu J, Xin P, Guo H, Wu J, Bai L, Wang G, Chu J, Zuo J, Yu H, Huang X, Li J. Malate transported from chloroplast to mitochondrion triggers production of ROS and PCD in Arabidopsis thaliana. Cell Res 2018. [PMID: 29540758 PMCID: PMC5939044 DOI: 10.1038/s41422-018-0024-8] [Citation(s) in RCA: 103] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Programmed cell death (PCD) is a fundamental biological process. Deficiency in MOSAIC DEATH 1 (MOD1), a plastid-localized enoyl-ACP reductase, leads to the accumulation of reactive oxygen species (ROS) and PCD, which can be suppressed by mitochondrial complex I mutations, indicating a signal from chloroplasts to mitochondria. However, this signal remains to be elucidated. In this study, through cloning and analyzing a series of mod1 suppressors, we reveal a comprehensive organelle communication pathway that regulates the generation of mitochondrial ROS and triggers PCD. We show that mutations in PLASTIDIAL NAD-DEPENDENT MALATE DEHYDROGENASE (plNAD-MDH), chloroplastic DICARBOXYLATE TRANSPORTER 1 (DiT1) and MITOCHONDRIAL MALATE DEHYDROGENASE 1 (mMDH1) can each rescue the ROS accumulation and PCD phenotypes in mod1, demonstrating a direct communication from chloroplasts to mitochondria via the malate shuttle. Further studies demonstrate that these elements play critical roles in the redox homeostasis and plant growth under different photoperiod conditions. Moreover, we reveal that the ROS level and PCD are significantly increased in malate-treated HeLa cells, which can be dramatically attenuated by knockdown of the human gene MDH2, an ortholog of Arabidopsis mMDH1. These results uncover a conserved malate-induced PCD pathway in plant and animal systems, revolutionizing our understanding of the communication between organelles.
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Affiliation(s)
- Yannan Zhao
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Lilan Luo
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Jiesi Xu
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Peiyong Xin
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Hongyan Guo
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Jian Wu
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.,Department of Plant Science, Weizmann Institute of Science, Rehovot, 7610001, Israel
| | - Lin Bai
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Guodong Wang
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Jinfang Chu
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Jianru Zuo
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Hong Yu
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.
| | - Xun Huang
- University of Chinese Academy of Sciences, Beijing, 100049, China. .,State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.
| | - Jiayang Li
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China. .,University of Chinese Academy of Sciences, Beijing, 100049, China.
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48
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Ten Prominent Host Proteases in Plant-Pathogen Interactions. Int J Mol Sci 2018; 19:ijms19020639. [PMID: 29495279 PMCID: PMC5855861 DOI: 10.3390/ijms19020639] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 02/17/2018] [Accepted: 02/17/2018] [Indexed: 12/16/2022] Open
Abstract
Proteases are enzymes integral to the plant immune system. Multiple aspects of defence are regulated by proteases, including the hypersensitive response, pathogen recognition, priming and peptide hormone release. These processes are regulated by unrelated proteases residing at different subcellular locations. In this review, we discuss 10 prominent plant proteases contributing to the plant immune system, highlighting the diversity of roles they perform in plant defence.
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49
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Wheat receptor-kinase-like protein Stb6 controls gene-for-gene resistance to fungal pathogen Zymoseptoria tritici. Nat Genet 2018; 50:368-374. [PMID: 29434355 DOI: 10.1038/s41588-018-0051-x] [Citation(s) in RCA: 135] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Accepted: 01/02/2018] [Indexed: 01/04/2023]
Abstract
Deployment of fast-evolving disease-resistance genes is one of the most successful strategies used by plants to fend off pathogens1,2. In gene-for-gene relationships, most cloned disease-resistance genes encode intracellular nucleotide-binding leucine-rich-repeat proteins (NLRs) recognizing pathogen-secreted isolate-specific avirulence (Avr) effectors delivered to the host cytoplasm3,4. This process often triggers a localized hypersensitive response, which halts further disease development 5 . Here we report the map-based cloning of the wheat Stb6 gene and demonstrate that it encodes a conserved wall-associated receptor kinase (WAK)-like protein, which detects the presence of a matching apoplastic effector6-8 and confers pathogen resistance without a hypersensitive response 9 . This report demonstrates gene-for-gene disease resistance controlled by this class of proteins in plants. Moreover, Stb6 is, to our knowledge, the first cloned gene specifying resistance to Zymoseptoria tritici, an important foliar fungal pathogen affecting wheat and causing economically damaging septoria tritici blotch (STB) disease10-12.
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50
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Hou YP, Mao XW, Lin SP, Song XS, Duan YB, Wang JX, Zhou MG. Activity of a novel succinate dehydrogenase inhibitor fungicide pyraziflumid against Sclerotinia sclerotiorum. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2018; 145:22-28. [PMID: 29482728 DOI: 10.1016/j.pestbp.2017.12.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2017] [Revised: 12/21/2017] [Accepted: 12/29/2017] [Indexed: 06/08/2023]
Abstract
Pyraziflumid is a novel member of succinate dehydrogenase inhibitor fungicides (SDHI). In this study, baseline sensitivity of Sclerotinia sclerotiorum (Lib.) de Bary to pyraziflumid was determined using 105 strains collected during 2015 and 2017 from different geographical regions in Jiangsu Province of China, and the average EC50 value was 0.0561 (±0.0263)μg/ml for mycelial growth. There was no cross-resistance between pyraziflumid and the widely used fungicides carbendazim, dimethachlon and the phenylpyrrole fungicide fludioxonil. After pyraziflumid treated, hyphae were contorted with offshoot of top increasing, cell membrane permeability increased markedly, oxalic acid content significantly decreased and mycelial respiration was strongly inhibited. But the number and dry weight of sclerotia did not change significantly. The protective and curative activity test of pyraziflumid suggested that pyraziflumid had great control efficiency against S. sclerotiorum on detached rapeseed leaves, and protective activity was better than curative activity. These results will contribute to us on evaluating the potential of the new SDHI fungicide pyraziflumid for management of diseases caused by S. sclerotiorum and understanding the mode of action of pyraziflumid against S. sclerotiorum.
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Affiliation(s)
- Yi-Ping Hou
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Xue-Wei Mao
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Shi-Peng Lin
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Xiu-Shi Song
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Ya-Bing Duan
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Jian-Xin Wang
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Ming-Guo Zhou
- College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China.
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