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Hussain A, Qayyum A, Farooq S, Almutairi SM, Rasheed RA, Qadir M, Vyhnánek T, Sun Y. Pepper immunity against Ralstonia solanacearum is positively regulated by CaWRKY3 through modulation of different WRKY transcription factors. BMC PLANT BIOLOGY 2024; 24:522. [PMID: 38853241 PMCID: PMC11163704 DOI: 10.1186/s12870-024-05143-z] [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: 10/16/2023] [Accepted: 05/13/2024] [Indexed: 06/11/2024]
Abstract
BACKGROUND Several WRKY transcription factors (TFs), including CaWRKY6, CaWRKY22, CaWRKY27, and CaWRKY40 are known to govern the resistance of pepper (Capsicum annuum L.) plants to Ralstonia solanacearum infestation (RSI) and other abiotic stresses. However, the molecular mechanisms underlying these processes remain elusive. METHODS This study functionally described CaWRKY3 for its role in pepper immunity against RSI. The roles of phytohormones in mediating the expression levels of CaWRKY3 were investigated by subjecting pepper plants to 1 mM salicylic acid (SA), 100 µM methyl jasmonate (MeJA), and 100 µM ethylene (ETH) at 4-leaf stage. A virus-induced gene silencing (VIGS) approach based on the Tobacco Rattle Virus (TRV) was used to silence CaWRKY3 in pepper, and transiently over-expressed to infer its role against RSI. RESULTS Phytohormones and RSI increased CaWRKY3 transcription. The transcriptions of defense-associated marker genes, including CaNPR1, CaPR1, CaDEF1, and CaHIR1 were decreased in VIGS experiment, which made pepper less resistant to RSI. Significant hypersensitive (HR)-like cell death, H2O2 buildup, and transcriptional up-regulation of immunological marker genes were noticed in pepper when CaWRKY3 was transiently overexpressed. Transcriptional activity of CaWRKY3 was increased with overexpression of CaWRKY6, CaWRKY22, CaWRKY27, and CaWRKY40, and vice versa. In contrast, Pseudomonas syringae pv tomato DC3000 (Pst DC3000) was easily repelled by the innate immune system of transgenic Arabidopsis thaliana that overexpressed CaWRKY3. The transcriptions of defense-related marker genes like AtPR1, AtPR2, and AtNPR1 were increased in CaWRKY3-overexpressing transgenic A. thaliana plants. CONCLUSION It is concluded that CaWRKY3 favorably regulates phytohormone-mediated synergistic signaling, which controls cell death in plant and immunity of pepper plant against bacterial infections.
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Affiliation(s)
- Ansar Hussain
- Innovative Institute for Plant Health, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China
- Department of Plant Breeding and Genetics, Ghazi University, Dera Ghazi Khan, 32200, Pakistan
| | - Abdul Qayyum
- Department of Plant Breeding and Genetics, Faculty of Agricultural Science and Technology, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Shahid Farooq
- Department of Plant Protection, Faculty of Agriculture, Harran University, Şanlıurfa, 63050, Türkiye.
| | - Saeedah Musaed Almutairi
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh, 11451, Saudi Arabia
| | - Rabab Ahmed Rasheed
- Histology & Cell Biology Department, Faculty of Medicine, King Salman International University, South Sinai, Egypt
| | - Masood Qadir
- Department of Plant Breeding and Genetics, Ghazi University, Dera Ghazi Khan, 32200, Pakistan
| | - Tomáš Vyhnánek
- Department of Plant Biology, Faculty of AgriSciences, Mendel University in Brno, Zemedelska 1, Brno, 61300, Czech Republic
| | - Yunhao Sun
- Innovative Institute for Plant Health, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China.
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Ranjit S, Deblais L, Poelstra JW, Bhandari M, Rotondo F, Scaria J, Miller SA, Rajashekara G. In vitro, in planta, and comparative genomic analyses of Pseudomonas syringae pv. syringae strains of pepper ( Capsicum annuum var. annuum). Microbiol Spectr 2024; 12:e0006424. [PMID: 38712940 DOI: 10.1128/spectrum.00064-24] [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: 02/13/2024] [Accepted: 04/15/2024] [Indexed: 05/08/2024] Open
Abstract
Pseudomonas syringae pv. syringae (Pss) is an emerging phytopathogen that causes Pseudomonas leaf spot (PLS) disease in pepper plants. Pss can cause serious economic damage to pepper production, yet very little is known about the virulence factors carried by Pss that cause disease in pepper seedlings. In this study, Pss strains isolated from pepper plants showing PLS symptoms in Ohio between 2013 and 2021 (n = 16) showed varying degrees of virulence (Pss populations and disease symptoms on leaves) on 6-week-old pepper seedlings. In vitro studies assessing growth in nutrient-limited conditions, biofilm production, and motility also showed varying degrees of virulence, but in vitro and in planta variation in virulence between Pss strains did not correlate. Comparative whole-genome sequencing studies identified notable virulence genes including 30 biofilm genes, 87 motility genes, and 106 secretion system genes. Additionally, a total of 27 antimicrobial resistance genes were found. A multivariate correlation analysis and Scoary analysis based on variation in gene content (n = 812 variable genes) and single nucleotide polymorphisms within virulence genes identified no significant correlations with disease severity, likely due to our limited sample size. In summary, our study explored the virulence and antimicrobial gene content of Pss in pepper seedlings as a first step toward understanding the virulence and pathogenicity of Pss in pepper seedlings. Further studies with additional pepper Pss strains will facilitate defining genes in Pss that correlate with its virulence in pepper seedlings, which can facilitate the development of effective measures to control Pss in pepper and other related P. syringae pathovars. IMPORTANCE Pseudomonas leaf spot (PLS) caused by Pseudomonas syringae pv. syringae (Pss) causes significant losses to the pepper industry. Highly virulent Pss strains under optimal environmental conditions (cool-moderate temperatures, high moisture) can cause severe necrotic lesions on pepper leaves that consequently can decrease pepper yield if the disease persists. Hence, it is important to understand the virulence mechanisms of Pss to be able to effectively control PLS in peppers. In our study, in vitro, in planta, and whole-genome sequence analyses were conducted to better understand the virulence and pathogenicity characteristics of Pss strains in peppers. Our findings fill a knowledge gap regarding potential virulence and pathogenicity characteristics of Pss in peppers, including virulence and antimicrobial gene content. Our study helps pave a path to further identify the role of specific virulence genes in causing disease in peppers, which can have implications in developing strategies to effectively control PLS in peppers.
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Affiliation(s)
- Sochina Ranjit
- Department of Animal Sciences, The Ohio State University, Wooster, Ohio, USA
| | - Loïc Deblais
- Department of Animal Sciences, The Ohio State University, Wooster, Ohio, USA
| | | | - Menuka Bhandari
- Department of Animal Sciences, The Ohio State University, Wooster, Ohio, USA
| | - Francesca Rotondo
- Department of Plant Pathology, The Ohio State University, Wooster, Ohio, USA
| | - Joy Scaria
- Department of Veterinary Pathobiology, Oklahoma State University, Stillwater, Oklahoma, USA
| | - Sally A Miller
- Department of Plant Pathology, The Ohio State University, Wooster, Ohio, USA
| | - Gireesh Rajashekara
- Department of Animal Sciences, The Ohio State University, Wooster, Ohio, USA
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Huang X, Yang S, Zhang Y, Shi Y, Shen L, Zhang Q, Qiu A, Guan D, He S. Temperature-dependent action of pepper mildew resistance locus O 1 in inducing pathogen immunity and thermotolerance. JOURNAL OF EXPERIMENTAL BOTANY 2024; 75:2064-2083. [PMID: 38011680 DOI: 10.1093/jxb/erad479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Accepted: 11/25/2023] [Indexed: 11/29/2023]
Abstract
Plant diseases tend to be more serious under conditions of high-temperature/high-humidity (HTHH) than under moderate conditions, and hence disease resistance under HTHH is an important determinant for plant survival. However, how plants cope with diseases under HTHH remains poorly understood. In this study, we used the pathosystem consisting of pepper (Capsicum annuum) and Ralstonia solanacearum (bacterial wilt) as a model to examine the functions of the protein mildew resistance locus O 1 (CaMLO1) and U-box domain-containing protein 21 (CaPUB21) under conditions of 80% humidity and either 28 °C or 37 °C. Expression profiling, loss- and gain-of-function assays involving virus-induced gene-silencing and overexpression in pepper plants, and protein-protein interaction assays were conducted, and the results showed that CaMLO1 acted negatively in pepper immunity against R. solanacearum at 28 °C but positively at 37 °C. In contrast, CaPUB21 acted positively in immunity at 28 °C but negatively at 37 °C. Importantly, CaPUB21 interacted with CaMLO1 under all of the tested conditions, but only the interaction in response to R. solanacearum at 37 °C or to exposure to 37 °C alone led to CaMLO1 degradation, thereby turning off defence responses against R. solanacearum at 37 °C and under high-temperature stress to conserve resources. Thus, we show that CaMLO1 and CaPUB21 interact with each other and function distinctly in pepper immunity against R. solanacearum in an environment-dependent manner.
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Affiliation(s)
- Xueying Huang
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Sheng Yang
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, Department of Vegetable Science, College of Horticulture, China Agricultural University, Beijing, 100193, China
| | - Yapeng Zhang
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Yuanyuan Shi
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Lei Shen
- College of Horticulture and Landscape Architecture, Yangzhou University, Yangzhou 225009, China
| | - Qixiong Zhang
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Ailian Qiu
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Deyi Guan
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Shuilin He
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
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4
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Zhang Y, Guo S, Zhang F, Gan P, Li M, Wang C, Li H, Gao G, Wang X, Kang Z, Zhang X. CaREM1.4 interacts with CaRIN4 to regulate Ralstonia solanacearum tolerance by triggering cell death in pepper. HORTICULTURE RESEARCH 2023; 10:uhad053. [PMID: 37213684 PMCID: PMC10199716 DOI: 10.1093/hr/uhad053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 03/17/2023] [Indexed: 05/23/2023]
Abstract
Remorins, plant-specific proteins, have a significant role in conferring on plants the ability to adapt to adverse environments. However, the precise function of remorins in resistance to biological stress remains largely unknown. Eighteen CaREM genes were identified in pepper genome sequences based on the C-terminal conserved domain that is specific to remorin proteins in this research. Phylogenetic relations, chromosomal localization, motif, gene structures, and promoter regions of these remorins were analyzed and a remorin gene, CaREM1.4, was cloned for further study. The transcription of CaREM1.4 in pepper was induced by infection with Ralstonia solanacearum. Knocking down CaREM1.4 in pepper using virus-induced gene silencing (VIGS) technologies reduced the resistance of pepper plants to R. solanacearum and downregulated the expression of immunity-associated genes. Conversely, transient overexpression of CaREM1.4 in pepper and Nicotiana benthamiana plants triggered hypersensitive response-mediated cell death and upregulated expression of defense-related genes. In addition, CaRIN4-12, which interacted with CaREM1.4 at the plasma membrane and cell nucleus, was knocked down with VIGS, decreasing the susceptibility of Capsicum annuum to R. solanacearum. Furthermore, CaREM1.4 reduced ROS production by interacting with CaRIN4-12 upon co-injection in pepper. Taken together, our findings suggest that CaREM1.4 may function as a positive regulator of the hypersensitive response, and it interacts with CaRIN4-12, which negatively regulates plant immune responses of pepper to R. solanacearum. Our study provides new evidence for comprehending the molecular regulatory network of plant cell death.
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Affiliation(s)
- Yanqin Zhang
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, 712100 Shaanxi, China
| | - Shuangyuan Guo
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, 712100 Shaanxi, China
| | - Feng Zhang
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, 712100 Shaanxi, China
| | - Pengfei Gan
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, 712100 Shaanxi, China
| | - Min Li
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, 712100 Shaanxi, China
| | - Cong Wang
- College of Life Sciences, Shanxi Normal University, Taiyuan 030000, Shanxi, China
| | - Huankun Li
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, 712100 Shaanxi, China
| | - Gang Gao
- College of Life Sciences, Shanxi Normal University, Taiyuan 030000, Shanxi, China
| | - Xiaojie Wang
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, 712100 Shaanxi, China
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5
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Huang Y, Cai W, Lu Q, Lv J, Wan M, Guan D, Yang S, He S. PMT6 Is Required for SWC4 in Positively Modulating Pepper Thermotolerance. Int J Mol Sci 2023; 24:ijms24054849. [PMID: 36902276 PMCID: PMC10003703 DOI: 10.3390/ijms24054849] [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: 01/14/2023] [Revised: 01/31/2023] [Accepted: 02/03/2023] [Indexed: 03/06/2023] Open
Abstract
High temperature stress (HTS), with growth and development impairment, is one of the most important abiotic stresses frequently encountered by plants, in particular solanacaes such as pepper, that mainly distribute in tropical and subtropical regions. Plants activate thermotolerance to cope with this stress; however, the underlying mechanism is currently not fully understood. SWC4, a shared component of SWR1- and NuA4 complexes implicated in chromatin remodeling, was previously found to be involved in the regulation of pepper thermotolerance, but the underlying mechanism remains poorly understood. Herein, PMT6, a putative methyltranferase was originally found to interact with SWC4 by co-immunoprecipitation (Co-IP)-combined LC/MS assay. This interaction was further confirmed by bimolecular fluorescent complimentary (BiFC) and Co-IP assay, and PMT6 was further found to confer SWC4 methylation. By virus-induced gene silencing, it was found that PMT6 silencing significantly reduced pepper basal thermotolerance and transcription of CaHSP24 and significantly reduced the enrichment of chromatin-activation-related H3K9ac, H4K5ac, and H3K4me3 in TSS of CaHSP24, which was previously found to be positively regulated by CaSWC4. By contrast, the overexpression of PMT6 significantly enhanced basal thermotolerance of pepper plants. All these data indicate that PMT6 acts as a positive regulator in pepper thermotolerance, likely by methylating SWC4.
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Affiliation(s)
- Yu Huang
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Weiwei Cai
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Qiaoling Lu
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Jingang Lv
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Meiyun Wan
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Deyi Guan
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Sheng Yang
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- Correspondence: (S.Y.); (S.H.)
| | - Shuilin He
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- Correspondence: (S.Y.); (S.H.)
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6
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Son S, Park SR. Climate change impedes plant immunity mechanisms. FRONTIERS IN PLANT SCIENCE 2022; 13:1032820. [PMID: 36523631 PMCID: PMC9745204 DOI: 10.3389/fpls.2022.1032820] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 11/14/2022] [Indexed: 06/02/2023]
Abstract
Rapid climate change caused by human activity is threatening global crop production and food security worldwide. In particular, the emergence of new infectious plant pathogens and the geographical expansion of plant disease incidence result in serious yield losses of major crops annually. Since climate change has accelerated recently and is expected to worsen in the future, we have reached an inflection point where comprehensive preparations to cope with the upcoming crisis can no longer be delayed. Development of new plant breeding technologies including site-directed nucleases offers the opportunity to mitigate the effects of the changing climate. Therefore, understanding the effects of climate change on plant innate immunity and identification of elite genes conferring disease resistance are crucial for the engineering of new crop cultivars and plant improvement strategies. Here, we summarize and discuss the effects of major environmental factors such as temperature, humidity, and carbon dioxide concentration on plant immunity systems. This review provides a strategy for securing crop-based nutrition against severe pathogen attacks in the era of climate change.
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Xiaohui Y, Jie H, Huixiao Y, Huanqin L, Fang X, Baozhu Z, Xiuyu X, Lei Z, Huayi H, Qingzhang D, Wen P. Transcriptome and metabolome profiling in different stages of infestation of Eucalyptus urophylla clones by Ralstonia solanacearum. Mol Genet Genomics 2022; 297:1081-1100. [PMID: 35616707 DOI: 10.1007/s00438-022-01903-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2021] [Accepted: 04/23/2022] [Indexed: 11/28/2022]
Abstract
Eucalyptus urophylla is an economically important tree species that widely planted in tropical and sub-tropical areas around the world, which suffers significant losses due to Ralstonia solanacearum. However, little is known about the molecular mechanism of pathogen-response of Eucalyptus. We collected the vascular tissues of a E. urophylla clone infected by R. solanacearum in the laboratory, and combined transcriptome and metabolome analysis to investigate the defense responses of Eucalyptus. A total of 11 flavonoids that differentially accumulated at the first stage or a later stage after infection. The phenylpropanoid of p-coumaraldehyde, the two alkaloids trigonelline and DL-ephedrine, two types of traditional Chinese medicine with patchouli alcohol and 3-dihydrocadambine, and the amino acid phenylalanine were differentially accumulated after infection, which could be biomarkers indicating a response to R. solanacearum. Differentially expressed genes involved in plant hormone signal transduction, phenylpropanoids, flavonoids, mitogen-activated protein kinase (MAPK) signaling, and amino acid metabolism were activated at the first stage of infection or a later stage, indicating that they may participate in the defense against infection. This study is expected to deliver several insights into the molecular mechanism in response to pathogens in E. urophylla, and the findings have far-reaching implications in the control of E. urophylla pathogens.
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Affiliation(s)
- Yang Xiaohui
- Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China.,Guangdong Academy of Forestry, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China
| | - Huang Jie
- Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China.,Guangdong Academy of Forestry, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China
| | - Yang Huixiao
- Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China.,Guangdong Academy of Forestry, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China
| | - Liao Huanqin
- Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China.,Guangdong Academy of Forestry, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China
| | - Xu Fang
- Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China.,Guangdong Academy of Forestry, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China
| | - Zhu Baozhu
- Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China.,Guangdong Academy of Forestry, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China
| | - Xu Xiuyu
- Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China.,Guangdong Academy of Forestry, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China
| | - Zhang Lei
- Dongmen State Forestry Farm of Guangxi Zhuang, No. 10, Jinlong Road, Fusui, 532108, Guangxi, People's Republic of China
| | - Huang Huayi
- Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China.,Guangdong Academy of Forestry, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China
| | - Du Qingzhang
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, No. 35 Qinghua East Road, Beijing, 100083, China. .,Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, College of Biological Sciences and Technology, Beijing Forestry University, No. 35 Qinghua East Road, Beijing, 100083, China.
| | - Pan Wen
- Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China. .,Guangdong Academy of Forestry, No. 233, Guangshan First Road, Guangzhou, 510520, Guangdong, People's Republic of China.
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8
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Yang S, Cai W, Shen L, Cao J, Liu C, Hu J, Guan D, He S. A CaCDPK29-CaWRKY27b module promotes CaWRKY40-mediated thermotolerance and immunity to Ralstonia solanacearum in pepper. THE NEW PHYTOLOGIST 2022; 233:1843-1863. [PMID: 34854082 DOI: 10.1111/nph.17891] [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: 08/28/2021] [Accepted: 11/18/2021] [Indexed: 06/13/2023]
Abstract
CaWRKY40 in pepper (Capsicum annuum) promotes immune responses to Ralstonia solanacearum infection (RSI) and to high-temperature, high-humidity (HTHH) stress, but how it interacts with upstream signalling components remains poorly understood. Here, using approaches of reverse genetics, biochemical and molecular biology we functionally characterised the relationships among the WRKYGMK-containing WRKY protein CaWRKY27b, the calcium-dependent protein kinase CaCDPK29, and CaWRKY40 during pepper response to RSI or HTHH. Our data indicate that CaWRKY27b is upregulated and translocated from the cytoplasm to the nucleus upon phosphorylation of Ser137 in the nuclear localisation signal by CaCDPK29. Using electrophoretic mobility shift assays and microscale thermophoresis, we observed that, due to the replacement of Q by M in the conserved WRKYGQK, CaWRKY27b in the nucleus failed to bind to W-boxes in the promoters of immunity- and thermotolerance-related marker genes. Instead, CaWRKY27b interacted with CaWRKY40 and promoted its binding and positive regulation of the tested marker genes including CaNPR1, CaDEF1 and CaHSP24. Notably, mutation of the WRKYGMK motif in CaWRKY27b to WRKYGQK restored the W-box binding ability. Our data therefore suggest that CaWRKY27b is phosphorylated by CaCDPK29 and acts as a transcriptional activator of CaWRKY40 during the pepper response to RSI and HTHH.
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Affiliation(s)
- Sheng Yang
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
| | - Weiwei Cai
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
| | - Lei Shen
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
| | - Jianshen Cao
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
| | - Cailing Liu
- Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, 350002, China
| | - Jiong Hu
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
| | - Deyi Guan
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
| | - Shuilin He
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
- Agricultural College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China
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9
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Koseoglou E, van der Wolf JM, Visser RGF, Bai Y. Susceptibility reversed: modified plant susceptibility genes for resistance to bacteria. TRENDS IN PLANT SCIENCE 2022; 27:69-79. [PMID: 34400073 DOI: 10.1016/j.tplants.2021.07.018] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 07/20/2021] [Accepted: 07/24/2021] [Indexed: 05/26/2023]
Abstract
Plants have evolved complex defence mechanisms to avoid invasion of potential pathogens. Despite this, adapted pathogens deploy effector proteins to manipulate host susceptibility (S) genes, rendering plant defences ineffective. The identification and mutation of plant S genes exploited by bacterial pathogens are important for the generation of crops with durable and broad-spectrum resistance. Application of mutant S genes in the breeding of resistant crops is limited because of potential pleiotropy. New genome editing techniques open up new possibilities for the modification of S genes. In this review, we focus on S genes manipulated by bacteria and propose ways for their identification and precise modification. Finally, we propose that genes coding for transporter proteins represent a new group of S genes.
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Affiliation(s)
- Eleni Koseoglou
- Plant Breeding, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Jan M van der Wolf
- Biointeractions & Plant Health, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Richard G F Visser
- Plant Breeding, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Yuling Bai
- Plant Breeding, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands.
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10
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Hussain A, Khan MI, Albaqami M, Mahpara S, Noorka IR, Ahmed MAA, Aljuaid BS, El-Shehawi AM, Liu Z, Farooq S, Zuan ATK. CaWRKY30 Positively Regulates Pepper Immunity by Targeting CaWRKY40 against Ralstonia solanacearum Inoculation through Modulating Defense-Related Genes. Int J Mol Sci 2021; 22:ijms222112091. [PMID: 34769521 PMCID: PMC8584995 DOI: 10.3390/ijms222112091] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 10/25/2021] [Accepted: 10/29/2021] [Indexed: 11/25/2022] Open
Abstract
The WRKY transcription factors (TFs) network is composed of WRKY TFs’ subset, which performs a critical role in immunity regulation of plants. However, functions of WRKY TFs’ network remain unclear, particularly in non-model plants such as pepper (Capsicum annuum L.). This study functionally characterized CaWRKY30—a member of group III Pepper WRKY protein—for immunity of pepper against Ralstonia solanacearum infection. The CaWRKY30 was detected in nucleus, and its transcriptional expression levels were significantly upregulated by R. solanacearum inoculation (RSI), and foliar application ethylene (ET), abscisic acid (ABA), and salicylic acid (SA). Virus induced gene silencing (VIGS) of CaWRKY30 amplified pepper’s vulnerability to RSI. Additionally, the silencing of CaWRKY30 by VIGS compromised HR-like cell death triggered by RSI and downregulated defense-associated marker genes, like CaPR1, CaNPR1, CaDEF1, CaABR1, CaHIR1, and CaWRKY40. Conversely, transient over-expression of CaWRKY30 in pepper leaves instigated HR-like cell death and upregulated defense-related maker genes. Furthermore, transient over-expression of CaWRKY30 upregulated transcriptional levels of CaWRKY6, CaWRKY22, CaWRKY27, and CaWRKY40. On the other hand, transient over-expression of CaWRKY6, CaWRKY22, CaWRKY27, and CaWRKY40 upregulated transcriptional expression levels of CaWRKY30. The results recommend that newly characterized CaWRKY30 positively regulates pepper’s immunity against Ralstonia attack, which is governed by synergistically mediated signaling by phytohormones like ET, ABA, and SA, and transcriptionally assimilating into WRKY TFs networks, consisting of CaWRKY6, CaWRKY22, CaWRKY27, and CaWRKY40. Collectively, our data will facilitate to explicate the underlying mechanism of crosstalk between pepper’s immunity and response to RSI.
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Affiliation(s)
- Ansar Hussain
- Department of Plant Breeding and Genetics, Ghazi University, Dera Ghazi Khan 32200, Pakistan; (A.H.); (M.I.K.); (S.M.); (I.R.N.)
| | - Muhammad Ifnan Khan
- Department of Plant Breeding and Genetics, Ghazi University, Dera Ghazi Khan 32200, Pakistan; (A.H.); (M.I.K.); (S.M.); (I.R.N.)
| | - Mohammed Albaqami
- Department of Biology, Faculty of Applied Science, Umm Al-Qura University, Makkah 21955, Saudi Arabia;
| | - Shahzadi Mahpara
- Department of Plant Breeding and Genetics, Ghazi University, Dera Ghazi Khan 32200, Pakistan; (A.H.); (M.I.K.); (S.M.); (I.R.N.)
| | - Ijaz Rasool Noorka
- Department of Plant Breeding and Genetics, Ghazi University, Dera Ghazi Khan 32200, Pakistan; (A.H.); (M.I.K.); (S.M.); (I.R.N.)
| | - Mohamed A. A. Ahmed
- Plant Production Department (Horticulture—Medicinal and Aromatic Plants), Faculty of Agriculture (Saba Basha), Alexandria University, Alexandria 21531, Egypt;
| | - Bandar S. Aljuaid
- Department of Biotechnology, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia; (B.S.A.); (A.M.E.-S.)
| | - Ahmed M. El-Shehawi
- Department of Biotechnology, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia; (B.S.A.); (A.M.E.-S.)
| | - Zhiqin Liu
- College of Crop Sciences, Fujian Agriculture and Forestry University, Fuzhou 350001, China
- Correspondence: (Z.L.); (A.T.K.Z.)
| | - Shahid Farooq
- Department of Plant Protection, Faculty of Agriculture, Harran University, Şanlıurfa 63050, Turkey;
| | - Ali Tan Kee Zuan
- Department of Land Management, Faculty of Agriculture, Universiti Putra Malaysia, Serdang 43400, Malaysia
- Correspondence: (Z.L.); (A.T.K.Z.)
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11
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Garcia-Ruiz H, Szurek B, Van den Ackerveken G. Stop helping pathogens: engineering plant susceptibility genes for durable resistance. Curr Opin Biotechnol 2021; 70:187-195. [PMID: 34153774 PMCID: PMC8878094 DOI: 10.1016/j.copbio.2021.05.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 05/21/2021] [Accepted: 05/23/2021] [Indexed: 11/30/2022]
Abstract
Alternatives to protect crops against diseases are desperately needed to secure world food production and make agriculture more sustainable. Genetic resistance to pathogens utilized so far is mostly based on single dominant resistance genes that mediate specific recognition of invaders and that is often rapidly broken by pathogen variants. Perturbation of plant susceptibility (S) genes offers an alternative providing plants with recessive resistance that is proposed to be more durable. S genes enable the establishment of plant disease, and their inactivation provides opportunities for resistance breeding of crops. However, loss of S gene function can have pleiotropic effects. Developments in genome editing technology promise to provide powerful methods to precisely interfere with crop S gene functions and reduce tradeoffs.
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Affiliation(s)
- Hernan Garcia-Ruiz
- Department of Plant Pathology, Nebraska Center for Virology, University of Nebraska-Lincoln, Lincoln, NE 68503, USA
| | - Boris Szurek
- PHIM Plant Health Institute, Univ Montpellier, IRD, CIRAD, INRAE, Institut Agro, Montpellier, France
| | - Guido Van den Ackerveken
- Plant-Microbe Interactions, Department of Biology, Utrecht University, Padualaan 8, 3584 CH Utrecht, Netherlands.
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