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Ameen M, Zafar A, Mahmood A, Zia MA, Kamran K, Javaid MM, Yasin M, Khan BA. Melatonin as a master regulatory hormone for genetic responses to biotic and abiotic stresses in model plant Arabidopsis thaliana: a comprehensive review. FUNCTIONAL PLANT BIOLOGY : FPB 2024; 51:FP23248. [PMID: 38310885 DOI: 10.1071/fp23248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 01/09/2024] [Indexed: 02/06/2024]
Abstract
Melatonin is a naturally occurring biologically active amine produced by plants, animals and microbes. This review explores the biosynthesis of melatonin in plants, with a particular focus on its diverse roles in Arabidopsis thaliana , a model species. Melatonin affects abiotic and biotic stress resistance in A. thaliana . Exogenous and endogenous melatonin is addressed in association with various conditions, including cold stress, high light stress, intense heat and infection with Botrytis cinerea or Pseudomonas , as well as in seed germination and lateral root formation. Furthermore, melatonin confers stress resistance in Arabidopsis by initiating the antioxidant system, remedying photosynthesis suppression, regulating transcription factors involved with stress resistance (CBF, DREB, ZAT, CAMTA, WRKY33, MYC2, TGA) and other stress-related hormones (abscisic acid, auxin, ethylene, jasmonic acid and salicylic acid). This article additionally addresses other precursors, metabolic components, expression of genes (COR , CBF , SNAT , ASMT , PIN , PR1 , PDF1.2 and HSFA ) and proteins (JAZ, NPR1) associated with melatonin and reducing both biological and environmental stressors. Furthermore, the future perspective of melatonin rich agri-crops is explored to enhance plant tolerance to abiotic and biotic stresses, maximise crop productivity and enhance nutritional worth, which may help improve food security.
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Affiliation(s)
- Muaz Ameen
- Department of Botany, University of Agriculture Faisalabad, Faisalabad, 38000, Pakistan
| | - Asma Zafar
- Department of Botany, University of Agriculture Faisalabad, Faisalabad, 38000, Pakistan
| | - Athar Mahmood
- Department of Agronomy, University of Agriculture Faisalabad, Faisalabad, 38000, Pakistan
| | - Muhammad Anjum Zia
- Department of Biochemistry, University of Agriculture Faisalabad, Faisalabad, 38000, Pakistan
| | - Kashif Kamran
- Department of Physics, University of Agriculture Faisalabad, Faisalabad, 38000, Pakistan
| | - Muhammad Mansoor Javaid
- Department of Agronomy, College of Agriculture, University of Sargodha, Sargodha 40100, Pakistan
| | - Muhammad Yasin
- Department of Agronomy, College of Agriculture, University of Sargodha, Sargodha 40100, Pakistan
| | - Bilal Ahmad Khan
- Department of Agronomy, College of Agriculture, University of Sargodha, Sargodha 40100, Pakistan
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Felemban A, Moreno JC, Mi J, Ali S, Sham A, AbuQamar SF, Al-Babili S. The apocarotenoid β-ionone regulates the transcriptome of Arabidopsis thaliana and increases its resistance against Botrytis cinerea. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2024; 117:541-560. [PMID: 37932864 DOI: 10.1111/tpj.16510] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 10/02/2023] [Accepted: 10/04/2023] [Indexed: 11/08/2023]
Abstract
Carotenoids are isoprenoid pigments indispensable for photosynthesis. Moreover, they are the precursor of apocarotenoids, which include the phytohormones abscisic acid (ABA) and strigolactones (SLs) as well as retrograde signaling molecules and growth regulators, such as β-cyclocitral and zaxinone. Here, we show that the application of the volatile apocarotenoid β-ionone (β-I) to Arabidopsis plants at micromolar concentrations caused a global reprogramming of gene expression, affecting thousands of transcripts involved in stress tolerance, growth, hormone metabolism, pathogen defense, and photosynthesis. This transcriptional reprogramming changes, along with induced changes in the level of the phytohormones ABA, jasmonic acid, and salicylic acid, led to enhanced Arabidopsis resistance to the widespread necrotrophic fungus Botrytis cinerea (B.c.) that causes the gray mold disease in many crop species and spoilage of harvested fruits. Pre-treatment of tobacco and tomato plants with β-I followed by inoculation with B.c. confirmed the effect of β-I in increasing the resistance to this pathogen in crop plants. Moreover, we observed reduced susceptibility to B.c. in fruits of transgenic tomato plants overexpressing LYCOPENE β-CYCLASE, which contains elevated levels of endogenous β-I, providing a further evidence for its effect on B.c. infestation. Our work unraveled β-I as a further carotenoid-derived regulatory metabolite and indicates the possibility of establishing this natural volatile as an environmentally friendly bio-fungicide to control B.c.
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Affiliation(s)
- Abrar Felemban
- The Bioactives Laboratory, Center for Desert Agriculture, 4700 King Abdullah University of Science and Technology, Thuwal, 23955, Saudi Arabia
- Plant Science Program, Biological and Environmental Science and Engineering Division, 4700 King Abdullah University of Science and Technology, Thuwal, 23955, Saudi Arabia
| | - Juan C Moreno
- The Bioactives Laboratory, Center for Desert Agriculture, 4700 King Abdullah University of Science and Technology, Thuwal, 23955, Saudi Arabia
- Plant Science Program, Biological and Environmental Science and Engineering Division, 4700 King Abdullah University of Science and Technology, Thuwal, 23955, Saudi Arabia
| | - Jianing Mi
- The Bioactives Laboratory, Center for Desert Agriculture, 4700 King Abdullah University of Science and Technology, Thuwal, 23955, Saudi Arabia
- Plant Science Program, Biological and Environmental Science and Engineering Division, 4700 King Abdullah University of Science and Technology, Thuwal, 23955, Saudi Arabia
| | - Shawkat Ali
- Kentville Research and Development Center, Agriculture and Agri-Food Canada, Kentville, Nova Scotia, B4N 1J5, Canada
| | - Arjun Sham
- Department of Biology, College of Science, United Arab Emirates University, Al Ain, 15551, United Arab Emirates
| | - Synan F AbuQamar
- Department of Biology, College of Science, United Arab Emirates University, Al Ain, 15551, United Arab Emirates
| | - Salim Al-Babili
- The Bioactives Laboratory, Center for Desert Agriculture, 4700 King Abdullah University of Science and Technology, Thuwal, 23955, Saudi Arabia
- Plant Science Program, Biological and Environmental Science and Engineering Division, 4700 King Abdullah University of Science and Technology, Thuwal, 23955, Saudi Arabia
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Ma L, Li X, Zhang J, Yi D, Li F, Wen H, Liu W, Wang X. MsWRKY33 increases alfalfa (Medicago sativa L.) salt stress tolerance through altering the ROS scavenger via activating MsERF5 transcription. PLANT, CELL & ENVIRONMENT 2023; 46:3887-3901. [PMID: 37656830 DOI: 10.1111/pce.14703] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 08/10/2023] [Accepted: 08/15/2023] [Indexed: 09/03/2023]
Abstract
Alfalfa (Medicago sativa L.) is considered to be the most important forage crop on a global scale. Nevertheless, soil salinity significantly decreases productivity, seriously threatening food security worldwide. One viable strategy is to explore salt stress-responsive factors and elucidate their underlying molecular mechanism, and utilize them in further alfalfa breeding. In the present study, we designated MsWRKY33 as a representative salt stress-responsive factor preferentially expressed in alfalfa roots and leaves. Subsequently, it was demonstrated that MsWRKY33 was localized in the cell nucleus, and functioned as a transcriptional activator of the W-box element. Transgenic alfalfa overexpressing MsWRKY33 displayed enhanced salt stress tolerance and antioxidant activities with no significant difference in other agronomic traits. Transcriptome profiling of MsWRKY33 transgenic alfalfa under control and salt treatment unveiled significantly altered expression of reactive oxygen species (ROS) scavenger genes in transgenic alfalfa. Subsequent examination revealed that MsWRKY33 binded to the promoter of MsERF5, activating its expression and consequently fine-tuning the ROS-scavenging enzyme activity. Furthermore, MsWRKY33 interacted with the functional fragment of MsCaMBP25, which participates in Ca2+ signaling transduction. Collectively, this research offers new insight into the molecular mechanism of alfalfa salt stress tolerance and highlights the potential utility of MsWRKY33 in alfalfa breeding.
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Affiliation(s)
- Lin Ma
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xin Li
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jinjin Zhang
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Dengxia Yi
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Feng Li
- Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan plateau, Qinghai Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining, China
- Beijing Cuihu Agricultural Technology Co., Ltd, Beijing, China
| | - Hongyu Wen
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Wenhui Liu
- Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan plateau, Qinghai Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining, China
| | - Xuemin Wang
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
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Nguyen NN, Lamotte O, Alsulaiman M, Ruffel S, Krouk G, Berger N, Demolombe V, Nespoulous C, Dang TMN, Aimé S, Berthomieu P, Dubos C, Wendehenne D, Vile D, Gosti F. Reduction in PLANT DEFENSIN 1 expression in Arabidopsis thaliana results in increased resistance to pathogens and zinc toxicity. JOURNAL OF EXPERIMENTAL BOTANY 2023; 74:5374-5393. [PMID: 37326591 DOI: 10.1093/jxb/erad228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 06/14/2023] [Indexed: 06/17/2023]
Abstract
Ectopic expression of defensins in plants correlates with their increased capacity to withstand abiotic and biotic stresses. This applies to Arabidopsis thaliana, where some of the seven members of the PLANT DEFENSIN 1 family (AtPDF1) are recognised to improve plant responses to necrotrophic pathogens and increase seedling tolerance to excess zinc (Zn). However, few studies have explored the effects of decreased endogenous defensin expression on these stress responses. Here, we carried out an extensive physiological and biochemical comparative characterization of (i) novel artificial microRNA (amiRNA) lines silenced for the five most similar AtPDF1s, and (ii) a double null mutant for the two most distant AtPDF1s. Silencing of five AtPDF1 genes was specifically associated with increased aboveground dry mass production in mature plants under excess Zn conditions, and with increased plant tolerance to different pathogens - a fungus, an oomycete and a bacterium, while the double mutant behaved similarly to the wild type. These unexpected results challenge the current paradigm describing the role of PDFs in plant stress responses. Additional roles of endogenous plant defensins are discussed, opening new perspectives for their functions.
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Affiliation(s)
- Ngoc Nga Nguyen
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Olivier Lamotte
- Agroécologie, CNRS, INRAE, Institut Agro, Université de Bourgogne, Université Bourgogne-Franche Comté, F-21 000 Dijon, France
| | - Mohanad Alsulaiman
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Sandrine Ruffel
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Gabriel Krouk
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Nathalie Berger
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Vincent Demolombe
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Claude Nespoulous
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Thi Minh Nguyet Dang
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Sébastien Aimé
- Agroécologie, CNRS, INRAE, Institut Agro, Université de Bourgogne, Université Bourgogne-Franche Comté, F-21 000 Dijon, France
| | - Pierre Berthomieu
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Christian Dubos
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - David Wendehenne
- Agroécologie, CNRS, INRAE, Institut Agro, Université de Bourgogne, Université Bourgogne-Franche Comté, F-21 000 Dijon, France
| | - Denis Vile
- LEPSE, INRAE, Institut Agro, Université de Montpellier, 2 Place P. Viala, F-34 060 Montpellier Cedex 2, France
| | - Françoise Gosti
- IPSiM, CNRS, INRAE, Institut Agro, Université de Montpellier, 2, Place P. Viala, F-34 060 Montpellier Cedex 2, France
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Rachowka J, Anielska-Mazur A, Bucholc M, Stephenson K, Kulik A. SnRK2.10 kinase differentially modulates expression of hub WRKY transcription factors genes under salinity and oxidative stress in Arabidopsis thaliana. FRONTIERS IN PLANT SCIENCE 2023; 14:1135240. [PMID: 37621885 PMCID: PMC10445769 DOI: 10.3389/fpls.2023.1135240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Accepted: 05/30/2023] [Indexed: 08/26/2023]
Abstract
In nature, all living organisms must continuously sense their surroundings and react to the occurring changes. In the cell, the information about these changes is transmitted to all cellular compartments, including the nucleus, by multiple phosphorylation cascades. Sucrose Non-Fermenting 1 Related Protein Kinases (SnRK2s) are plant-specific enzymes widely distributed across the plant kingdom and key players controlling abscisic acid (ABA)-dependent and ABA-independent signaling pathways in the plant response to osmotic stress and salinity. The main deleterious effects of salinity comprise water deficiency stress, disturbances in ion balance, and the accompanying appearance of oxidative stress. The reactive oxygen species (ROS) generated at the early stages of salt stress are involved in triggering intracellular signaling required for the fast stress response and modulation of gene expression. Here we established in Arabidopsis thaliana that salt stress or induction of ROS accumulation by treatment of plants with H2O2 or methyl viologen (MV) induces the expression of several genes encoding transcription factors (TFs) from the WRKY DNA-Binding Protein (WRKY) family. Their induction by salinity was dependent on SnRK2.10, an ABA non-activated kinase, as it was strongly reduced in snrk2.10 mutants. The effect of ROS was clearly dependent on their source. Following the H2O2 treatment, SnRK2.10 was activated in wild-type (wt) plants and the induction of the WRKY TFs expression was only moderate and was enhanced in snrk2.10 lines. In contrast, MV did not activate SnRK2.10 and the WRKY induction was very strong and was similar in wt and snrk2.10 plants. A bioinformatic analysis indicated that the WRKY33, WRKY40, WRKY46, and WRKY75 transcription factors have a similar target range comprising numerous stress-responsive protein kinases. Our results indicate that the stress-related functioning of SnRK2.10 is fine-tuned by the source and intracellular distribution of ROS and the co-occurrence of other stress factors.
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Affiliation(s)
| | | | | | | | - Anna Kulik
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
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Shen X, Ping Y, Bao C, Liu C, Tahir MM, Li X, Song Y, Xu W, Ma F, Guan Q. Mdm-miR160-MdARF17-MdWRKY33 module mediates freezing tolerance in apple. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2023; 114:262-278. [PMID: 36738108 DOI: 10.1111/tpj.16132] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 01/24/2023] [Accepted: 01/30/2023] [Indexed: 05/10/2023]
Abstract
Apple (Malus domestica) trees are vulnerable to freezing temperatures. Cold resistance in woody perennial plants can be improved through biotechnological approaches. However, genetic engineering requires a thorough understanding of the molecular mechanisms of the tree's response to cold. In this study, we demonstrated that the Mdm-miR160-MdARF17-MdWRKY33 module is crucial for apple freezing tolerance. Mdm-miR160 plays a negative role in apple freezing tolerance, whereas MdARF17, one of the targets of Mdm-miR160, is a positive regulator of apple freezing tolerance. RNA sequencing analysis revealed that in apple, MdARF17 mediates the cold response by influencing the expression of cold-responsive genes. EMSA and ChIP-qPCR assays demonstrated that MdARF17 can bind to the promoter of MdWRKY33 and promotes its expression. Overexpression of MdWRKY33 enhanced the cold tolerance of the apple calli. In addition, we found that the Mdm-miR160-MdARF17-MdWRKY33 module regulates cold tolerance in apple by regulating reactive oxygen species (ROS) scavenging, as revealed by (i) increased H2 O2 levels and decreased peroxidase (POD) and catalase (CAT) activities in Mdm-miR160e OE plants and MdARF17 RNAi plants and (ii) decreased H2 O2 levels and increased POD and CAT activities in MdmARF17 OE plants and MdWRKY33 OE calli. Taken together, our study uncovered the molecular roles of the Mdm-miR160-MdARF17-MdWRKY33 module in freezing tolerance in apple, thus providing support for breeding of cold-tolerant apple cultivars.
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Affiliation(s)
- Xiaoxia Shen
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Yikun Ping
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Chana Bao
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Chen Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Muhammad Mobeen Tahir
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Xuewei Li
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Yi Song
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Weirong Xu
- Ningxia Engineering and Technology Research Center of Grape and Wine, Ningxia University, Yinchuan, 750021, Ningxia, China
| | - Fengwang Ma
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Qingmei Guan
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, China
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Thakur R, Devi R, Lal MK, Tiwari RK, Sharma S, Kumar R. Morphological, ultrastructural and molecular variations in susceptible and resistant genotypes of chickpea infected with Botrytis grey mould. PeerJ 2023; 11:e15134. [PMID: 37009149 PMCID: PMC10064989 DOI: 10.7717/peerj.15134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 03/06/2023] [Indexed: 03/30/2023] Open
Abstract
Biotic stress due to fungal infection is detrimental to the growth and development of chickpea. In our study, two chickpea genotypes viz Cicer pinnatifidum (resistant) and PBG5 (susceptible) were inoculated with (1 × 104 spore mL−1) of nectrotrophic fungus Botrytis cinerea at seedling stage. These seedlings were evaluated for morphological, ultrastructural, and molecular differences after 3, 5 and 7 days post inoculation (dpi). Visual symptoms were recorded in terms of water-soaked lesions, rotten pods and twigs with fungal colonies. Light and scanning electron microscopy (SEM) revealed the differences in number of stomata, hyphal network and extent of topographical damage in resistant (C. pinnatifidum) and susceptible (PBG5) genotypes, which were validated by stomatal index studies done by using fluorescence microscopy in the infection process of B. cinerea in leaves of both chickpea genotypes. In case of control (water inoculated) samples, there were differences in PCR analysis done using five primers for screening the genetic variations between two genotypes. The presence of a Botrytis responsive gene (LrWRKY) of size ~300 bp was observed in uninoculated resistant genotype which might have a role in resistance against Botrytis grey mould. The present investigation provides information about the variation in the infection process of B. cinerea in two genotypes which can be further exploited to develop robust and effective strategies to manage grey mould disease.
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Affiliation(s)
- Richa Thakur
- Department of Biochemistry, Punjab Agricultural University, Ludhiana, Punjab, India
| | - Rajni Devi
- Department of Microbiology, Punjab Agricultural University, Ludhiana, Punjab, India
| | - Milan Kumar Lal
- Division of Crop Physiology, Biochemistry and Post harvest Technology, ICAR-Central Potato Research Institute, Shimla, Himachal Pradesh, India
| | - Rahul Kumar Tiwari
- Division of Plant Protection, ICAR-Central Potato Research Institute, Shimla, Himachal Pradesh, India
| | - Sucheta Sharma
- Department of Biochemistry, Punjab Agricultural University, Ludhiana, Punjab, India
| | - Ravinder Kumar
- Division of Plant Protection, ICAR-Central Potato Research Institute, Shimla, Himachal Pradesh, India
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8
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Zhou F, Zhang K, Zheng X, Wang G, Cao H, Xing J, Dong J. BTB and TAZ domain protein BT4 positively regulates the resistance to Botrytis cinerea in Arabidopsis. PLANT SIGNALING & BEHAVIOR 2022; 17:2104003. [PMID: 35876605 PMCID: PMC9318297 DOI: 10.1080/15592324.2022.2104003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Revised: 07/14/2022] [Accepted: 07/15/2022] [Indexed: 06/15/2023]
Abstract
BT4 gene was identified to play an important role in Arabidopsis resistance to pst DC3000 in preliminary studies. However, the specific function and molecular mechanism of BT4 gene in regulation of Arabidopsis resistance to Botrytis cinerea had not been described to date. In this study, we found that the expression of BT4 was induced by wounding and B. cinerea inoculation in Arabidopsis. After inoculated with B. cinerea, T-DNA insertion mutants of the BT4 gene, bt4, showed significant susceptibility symptoms, whereas no significant symptoms were found in wild-type (WT), the complemented transgenic plants (CE), and the overexpression transgenic plants (OE). After inoculated with B. cinerea, the expression levels of JAR1 and PDF1.2 genes in bt4 mutant were induced; however, the expression levels of these genes in bt4 mutant were significantly lower than those in the WT, CE, and OE. These results indicated that the BT4 positively regulate the expression of genes in JA/ET signaling pathways. Therefore, the BT4 may be involved in the regulation of JA/ET signaling pathways to affect Arabidopsis resistance to B. cinerea.
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Affiliation(s)
- Fan Zhou
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Key Laboratory of Plant Physiology and Molecular Pathology, Hebei Agricultural University, Baoding, China
| | - Kang Zhang
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Key Laboratory of Plant Physiology and Molecular Pathology, Hebei Agricultural University, Baoding, China
| | - Xu Zheng
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Key Laboratory of Plant Physiology and Molecular Pathology, Hebei Agricultural University, Baoding, China
| | - Guanyu Wang
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Key Laboratory of Plant Physiology and Molecular Pathology, Hebei Agricultural University, Baoding, China
| | - Hongzhe Cao
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Key Laboratory of Plant Physiology and Molecular Pathology, Hebei Agricultural University, Baoding, China
| | - Jihong Xing
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Key Laboratory of Plant Physiology and Molecular Pathology, Hebei Agricultural University, Baoding, China
| | - Jingao Dong
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Key Laboratory of Plant Physiology and Molecular Pathology, Hebei Agricultural University, Baoding, China
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El-Saadony MT, Saad AM, Soliman SM, Salem HM, Desoky ESM, Babalghith AO, El-Tahan AM, Ibrahim OM, Ebrahim AAM, Abd El-Mageed TA, Elrys AS, Elbadawi AA, El-Tarabily KA, AbuQamar SF. Role of Nanoparticles in Enhancing Crop Tolerance to Abiotic Stress: A Comprehensive Review. FRONTIERS IN PLANT SCIENCE 2022; 13:946717. [PMID: 36407622 PMCID: PMC9670308 DOI: 10.3389/fpls.2022.946717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Accepted: 06/22/2022] [Indexed: 06/16/2023]
Abstract
Plants are subjected to a wide range of abiotic stresses, such as heat, cold, drought, salinity, flooding, and heavy metals. Generally, abiotic stresses have adverse impacts on plant growth and development which affects agricultural productivity, causing food security problems, and resulting in economic losses. To reduce the negative effects of environmental stress on crop plants, novel technologies, such as nanotechnology, have emerged. Implementing nanotechnology in modern agriculture can also help improve the efficiency of water usage, prevent plant diseases, ensure food security, reduce environmental pollution, and enhance sustainability. In this regard, nanoparticles (NPs) can help combat nutrient deficiencies, promote stress tolerance, and improve the yield and quality of crops. This can be achieved by stimulating the activity of certain enzymes, increasing the contents (e.g., chlorophyll) and efficiency of photosynthesis, and controlling plant pathogens. The use of nanoscale agrochemicals, including nanopesticides, nanoherbicides, and nanofertilizers, has recently acquired increasing interest as potential plant-enhancing technologies. This review acknowledges the positive impacts of NPs in sustainable agriculture, and highlights their adverse effects on the environment, health, and food chain. Here, the role and scope of NPs as a practical tool to enhance yield and mitigate the detrimental effects of abiotic stresses in crops are described. The future perspective of nanoparticles in agriculture has also been discussed.
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Affiliation(s)
- Mohamed T. El-Saadony
- Department of Agricultural Microbiology, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - Ahmed M. Saad
- Department of Biochemistry, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - Soliman M. Soliman
- Department of Internal Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
| | - Heba M. Salem
- Department of Poultry Diseases, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
| | - El-Sayed M. Desoky
- Botany Department, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - Ahmad O. Babalghith
- Department of Medical Genetics, College of Medicine, Umm Al-Qura University, Mecca, Saudi Arabia
| | - Amira M. El-Tahan
- Department of Plant Production, Arid Lands Cultivation Research Institute, The City of Scientific Research and Technological Applications, SRTA-City, Alexandria, Egypt
| | - Omar M. Ibrahim
- Department of Plant Production, Arid Lands Cultivation Research Institute, The City of Scientific Research and Technological Applications, SRTA-City, Alexandria, Egypt
| | - Alia A. M. Ebrahim
- School of Life Sciences, Jiangsu Key Laboratory for Microbes and Genomics, Nanjing Normal University, Nanjing, China
| | - Taia A. Abd El-Mageed
- Department of Soils and Water, Faculty of Agriculture, Fayoum University, Fayoum, Egypt
| | - Ahmed S. Elrys
- Department of Soil Science, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - Alaa A. Elbadawi
- Department of Biology, College of Science, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Khaled A. El-Tarabily
- Department of Biology, College of Science, United Arab Emirates University, Al Ain, United Arab Emirates
- Khalifa Center for Genetic Engineering and Biotechnology, United Arab Emirates University, Al Ain, United Arab Emirates
- Harry Butler Institute, Murdoch University, Murdoch, WA, Australia
| | - Synan F. AbuQamar
- Department of Biology, College of Science, United Arab Emirates University, Al Ain, United Arab Emirates
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10
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El-Saadony MT, Saad AM, Soliman SM, Salem HM, Ahmed AI, Mahmood M, El-Tahan AM, Ebrahim AAM, Abd El-Mageed TA, Negm SH, Selim S, Babalghith AO, Elrys AS, El-Tarabily KA, AbuQamar SF. Plant growth-promoting microorganisms as biocontrol agents of plant diseases: Mechanisms, challenges and future perspectives. FRONTIERS IN PLANT SCIENCE 2022; 13:923880. [PMID: 36275556 PMCID: PMC9583655 DOI: 10.3389/fpls.2022.923880] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 08/24/2022] [Indexed: 05/14/2023]
Abstract
Plant diseases and pests are risk factors that threaten global food security. Excessive chemical pesticide applications are commonly used to reduce the effects of plant diseases caused by bacterial and fungal pathogens. A major concern, as we strive toward more sustainable agriculture, is to increase crop yields for the increasing population. Microbial biological control agents (MBCAs) have proved their efficacy to be a green strategy to manage plant diseases, stimulate plant growth and performance, and increase yield. Besides their role in growth enhancement, plant growth-promoting rhizobacteria/fungi (PGPR/PGPF) could suppress plant diseases by producing inhibitory chemicals and inducing immune responses in plants against phytopathogens. As biofertilizers and biopesticides, PGPR and PGPF are considered as feasible, attractive economic approach for sustainable agriculture; thus, resulting in a "win-win" situation. Several PGPR and PGPF strains have been identified as effective BCAs under environmentally controlled conditions. In general, any MBCA must overcome certain challenges before it can be registered or widely utilized to control diseases/pests. Successful MBCAs offer a practical solution to improve greenhouse crop performance with reduced fertilizer inputs and chemical pesticide applications. This current review aims to fill the gap in the current knowledge of plant growth-promoting microorganisms (PGPM), provide attention about the scientific basis for policy development, and recommend further research related to the applications of PGPM used for commercial purposes.
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Affiliation(s)
- Mohamed T. El-Saadony
- Department of Agricultural Microbiology, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - Ahmed M. Saad
- Department of Biochemistry, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - Soliman M. Soliman
- Department of Internal Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
| | - Heba M. Salem
- Department of Poultry Diseases, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
| | - Alshaymaa I. Ahmed
- Department of Agricultural Microbiology, Faculty of Agriculture, Beni-Suef University, Beni-Suef, Egypt
| | - Mohsin Mahmood
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Hainan University, Haikou, China
| | - Amira M. El-Tahan
- Plant Production Department, Arid Lands Cultivation Research Institute, The City of Scientific Research and Technological Applications, Alexandria, Egypt
| | - Alia A. M. Ebrahim
- Jiangsu Key Laboratory for Microbes and Genomics, School, of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Taia A. Abd El-Mageed
- Department of Soils and Water, Faculty of Agriculture, Fayoum University, Fayoum, Egypt
| | - Shaimaa H. Negm
- Department of Home Economic, Specific Education Faculty, Port Said University, Port Said, Egypt
| | - Samy Selim
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Jouf University, Sakaka, Saudi Arabia
| | - Ahmad O. Babalghith
- Medical Genetics Department, College of Medicine, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Ahmed S. Elrys
- Soil Science Department, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - Khaled A. El-Tarabily
- Department of Biology, College of Science, United Arab Emirates University, Al-Ain, United Arab Emirates
- Khalifa Center for Genetic Engineering and Biotechnology, United Arab Emirates University, Al-Ain, United Arab Emirates
- Harry Butler Institute, Murdoch University, Murdoch, WA, Australia
- *Correspondence: Khaled A. El-Tarabily,
| | - Synan F. AbuQamar
- Department of Biology, College of Science, United Arab Emirates University, Al-Ain, United Arab Emirates
- Synan F. AbuQamar,
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11
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Alblooshi AA, Purayil GP, Saeed EE, Ramadan GA, Tariq S, Altaee AS, El-Tarabily KA, AbuQamar SF. Biocontrol Potential of Endophytic Actinobacteria against Fusarium solani, the Causal Agent of Sudden Decline Syndrome on Date Palm in the UAE. J Fungi (Basel) 2021; 8:jof8010008. [PMID: 35049948 PMCID: PMC8779766 DOI: 10.3390/jof8010008] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/16/2021] [Accepted: 12/18/2021] [Indexed: 01/07/2023] Open
Abstract
Thirty-one endophytic streptomycete and non-streptomycete actinobacteria were isolated from healthy date palm root tissues. In vitro screening revealed that the antifungal action of isolate #16 was associated with the production of cell-wall degrading enzymes, whereas with diffusible antifungal metabolites in isolate #28, albeit their production of volatile antifungal compounds. According to the 16S rRNA gene sequencing, isolates #16 and #28 were identified as Streptomyces polychromogenes UAE2 (Sp; GenBank Accession #: OK560620) and Streptomyces coeruleoprunus UAE1 (Sc; OK560621), respectively. The two antagonists were recovered from root tissues until 12 weeks after inoculation, efficiently colonized root cortex and xylem vessels, indicating that the date palm roots are a suitable habitat for these endophytic isolates. At the end of the greenhouse experiments, the development of sudden decline syndrome (SDS) was markedly suppressed by 53% with the application of Sp and 86% with Sc, confirming their potential in disease management. Results showed that the estimated disease severity indices in diseased seedlings were significantly (p < 0.05) reduced from 4.75 (scale of 5) to 2.25 or 0.67 by either Sp or Sc, respectively. In addition, conidial numbers of the pathogen significantly (p < 0.05) dropped by 38% and 76% with Sp and Sc, respectively, compared to infected seedlings with F. solani (control). Thus, the suppression of disease symptoms was superior in seedlings pre-inoculated with S. coeruleoprunus, indicating that the diffusible antifungal metabolites were responsible for F. solani retardation in these plants. This is the first report of actinobacteria naturally existing in date palm tissues acting as microbial antagonists against SDS on date palm.
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Affiliation(s)
- Aisha A. Alblooshi
- Department of Biology, College of Science, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (A.A.A.); (G.P.P.); (G.A.R.); (A.S.A.)
| | - Gouthaman P. Purayil
- Department of Biology, College of Science, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (A.A.A.); (G.P.P.); (G.A.R.); (A.S.A.)
| | - Esam Eldin Saeed
- Khalifa Center for Genetic Engineering and Biotechnology, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (E.E.S.)
| | - Gaber A. Ramadan
- Department of Biology, College of Science, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (A.A.A.); (G.P.P.); (G.A.R.); (A.S.A.)
| | - Saeed Tariq
- Department of Anatomy, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (S.T.)
| | - Amna S. Altaee
- Department of Biology, College of Science, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (A.A.A.); (G.P.P.); (G.A.R.); (A.S.A.)
| | - Khaled A. El-Tarabily
- Department of Biology, College of Science, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (A.A.A.); (G.P.P.); (G.A.R.); (A.S.A.)
- Harry Butler Institute, Murdoch University, Murdoch, WA 6150, Australia
- Correspondence: (K.A.E.-T.); (S.F.A.); Tel.: +971-3-713-6518 (K.A.E.-T.); +971-3-713-6733 (S.F.A.)
| | - Synan F. AbuQamar
- Department of Biology, College of Science, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (A.A.A.); (G.P.P.); (G.A.R.); (A.S.A.)
- Correspondence: (K.A.E.-T.); (S.F.A.); Tel.: +971-3-713-6518 (K.A.E.-T.); +971-3-713-6733 (S.F.A.)
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12
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Chen J, Liu K, Zha W, Zhou L, Li M, Xu H, Li P, Chen Z, Yang G, Chen P, Li S, You A. Identification and verification of grain shape QTLs by SNP array in rice. PLoS One 2021; 16:e0260133. [PMID: 34807926 PMCID: PMC8608341 DOI: 10.1371/journal.pone.0260133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Accepted: 11/04/2021] [Indexed: 11/21/2022] Open
Abstract
Grain shape strongly influences the economic value and grain yield of rice. Thus, identifying quantitative trait loci (QTLs) for grain shape has been a longstanding goal in rice genetic research and breeding programs. Single nucleotide polymorphism (SNP) markers are ubiquitous in the rice genome and are more abundant and evenly distributed on the 12 rice chromosomes than traditional markers. An F2 population was genotyped using the RICE6K SNP array to elucidate the mechanisms governing grain shape. Thirty-five QTLs for grain shape were detected on 11 of 12 chromosomes over 2 years. The major QTL cluster qGS7 was detected in both years and displayed strong genetic effects on grain length and width, showing consistency with GL7/GW7. Some minor QTLs were also detected, and the effects of four QTLs on seed size were then validated using BC1F6 populations with residual heterozygous lines in each QTL region. Our findings provide insights into the molecular basis of grain shape as well as additional resources and approaches for producing hybrid high-yield rice varieties.
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Affiliation(s)
- Junxiao Chen
- Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Kai Liu
- Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Wenjun Zha
- Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Lei Zhou
- Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Ming Li
- Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Huashan Xu
- Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Peide Li
- Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Zhijun Chen
- Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Guocai Yang
- Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Pingli Chen
- Guangdong Key Laboratory of New Technology in Rice Breeding, The Rice Research Institute of Guangdong Academy of Agricultural Sciences, Guangzhou, China
| | - Sanhe Li
- Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
- * E-mail: (AY); (SL)
| | - Aiqing You
- Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
- * E-mail: (AY); (SL)
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13
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Mauceri A, Abenavoli MR, Toppino L, Panda S, Mercati F, Aci MM, Aharoni A, Sunseri F, Rotino GL, Lupini A. Transcriptomics reveal new insights into molecular regulation of nitrogen use efficiency in Solanum melongena. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:4237-4253. [PMID: 33711100 DOI: 10.1093/jxb/erab121] [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: 12/22/2020] [Accepted: 03/11/2021] [Indexed: 06/12/2023]
Abstract
Nitrogen-use efficiency (NUE) is a complex trait of great interest in breeding programs because through its improvement, high crop yields can be maintained whilst N supply is reduced. In this study, we report a transcriptomic analysis of four NUE-contrasting eggplant (Solanum melongena) genotypes following short- and long-term exposure to low N, to identify key genes related to NUE in the roots and shoots. The differentially expressed genes in the high-NUE genotypes are involved in the light-harvesting complex and receptor, a ferredoxin-NADP reductase, a catalase and WRKY33. These genes were then used as bait for a co-expression gene network analysis in order to identify genes with the same trends in expression. This showed that up-regulation of WRKY33 triggered higher expression of a cluster of 21 genes and also of other genes, many of which were related to N-metabolism, that were able to improve both nitrogen uptake efficiency and nitrogen utilization efficiency, the two components of NUE. We also conducted an independent de novo experiment to validate the significantly higher expression of WRKY33 and its gene cluster in the high-NUE genotypes. Finally, examination of an Arabidopsis transgenic 35S::AtWRKY33 overexpression line showed that it had a bigger root system and was more efficient at taking up N from the soil, confirming the pivotal role of WRKY33 for NUE improvement.
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Affiliation(s)
- Antonio Mauceri
- Dipartimento Agraria, Università degli Studi Mediterranea di Reggio Calabria, Loc. Feo di Vito, Reggio Calabria, Italy
| | - Maria Rosa Abenavoli
- Dipartimento Agraria, Università degli Studi Mediterranea di Reggio Calabria, Loc. Feo di Vito, Reggio Calabria, Italy
| | - Laura Toppino
- CREA - Research Centre for Genomics and Bioinformatics, Via Paullese 28, Montanaso Lombardo, Italy
| | - Sayantan Panda
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Francesco Mercati
- Istituto di Bioscienze e Biorisorse CNR - Consiglio Nazionale Ricerche, Corso Calatafimi 414, Palermo, Italy
| | - Meriem Miyassa Aci
- Dipartimento Agraria, Università degli Studi Mediterranea di Reggio Calabria, Loc. Feo di Vito, Reggio Calabria, Italy
| | - Asaph Aharoni
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Francesco Sunseri
- Dipartimento Agraria, Università degli Studi Mediterranea di Reggio Calabria, Loc. Feo di Vito, Reggio Calabria, Italy
| | - Giuseppe Leonardo Rotino
- CREA - Research Centre for Genomics and Bioinformatics, Via Paullese 28, Montanaso Lombardo, Italy
| | - Antonio Lupini
- Dipartimento Agraria, Università degli Studi Mediterranea di Reggio Calabria, Loc. Feo di Vito, Reggio Calabria, Italy
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14
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Singh P, Mukhopadhyay K. Comprehensive molecular dissection of TIFY Transcription factors reveal their dynamic responses to biotic and abiotic stress in wheat (Triticum aestivum L.). Sci Rep 2021; 11:9739. [PMID: 33958607 PMCID: PMC8102568 DOI: 10.1038/s41598-021-87722-w] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 03/31/2021] [Indexed: 02/03/2023] Open
Abstract
The plant specific TIFY (previously known as ZIM) transcription factor (TF) family plays crucial roles in cross talk between Jasmonic Acid and other phytohormones like gibberellins, salicylic acid, abscisic acid, auxin, and ethylene signaling pathways. Wheat yield is severely affected by rust diseases and many abiotic stresses, where different phytohormone signaling pathways are involved. TIFYs have been studied in many plants yet reports describing their molecular structure and function in wheat are lacking. In the present study, we have identified 23 novel TIFY genes in wheat genome using in silico approaches. The identified proteins were characterized based on their conserved domains and phylogenetically classified into nine subfamilies. Chromosomal localization of the identified TIFY genes showed arbitrary distribution. Forty cis-acting elements including phytohormone, stress and light receptive elements were detected in the upstream regions of TIFY genes. Seventeen wheat microRNAs targeted the identified wheat TIFY genes. Gene ontological studies revealed their major contribution in defense response and phytohormone signaling. Secondary structure of TIFY proteins displayed the characteristic alpha-alpha-beta fold. Synteny analyses indicated all wheat TIFY genes had orthologous sequences in sorghum, rice, maize, barley and Brachypodium indicating presence of similar TIFY domains in monocot plants. Six TIFY genes had been cloned from wheat genomic and cDNA. Sequence characterization revealed similar characteristics as the in silico identified novel TIFY genes. Tertiary structures predicted the active sites in these proteins to play critical roles in DNA binding. Expression profiling of TIFY genes showed their contribution during incompatible and compatible leaf rust infestation. TIFY genes were also highly expressed during the initial hours of phytohormone induced stress. This study furnishes fundamental information on characterization and putative functions of TIFY genes in wheat.
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Affiliation(s)
- Poonam Singh
- Department of Bio-Engineering, Birla Institute of Technology, Mesra, Ranchi, 835215, Jharkhand, India
| | - Kunal Mukhopadhyay
- Department of Bio-Engineering, Birla Institute of Technology, Mesra, Ranchi, 835215, Jharkhand, India.
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15
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Abstract
Recent progress in transcriptomics and co-expression networks have enabled us to predict the inference of the biological functions of genes with the associated environmental stress. Microarrays and RNA sequencing (RNA-seq) are the most commonly used high-throughput gene expression platforms for detecting differentially expressed genes between two (or more) phenotypes. Gene co-expression networks (GCNs) are a systems biology method for capturing transcriptional patterns and predicting gene interactions into functional and regulatory relationships. Here, we describe the procedures and tools used to construct and analyze GCN and investigate the integration of transcriptional data with GCN to provide reliable information about the underlying biological mechanism.
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16
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Tang H, Bi H, Liu B, Lou S, Song Y, Tong S, Chen N, Jiang Y, Liu J, Liu H. WRKY33 interacts with WRKY12 protein to up-regulate RAP2.2 during submergence induced hypoxia response in Arabidopsis thaliana. THE NEW PHYTOLOGIST 2021; 229:106-125. [PMID: 33098101 DOI: 10.1111/nph.17020] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 10/12/2020] [Indexed: 05/23/2023]
Abstract
Tolerance of hypoxia is essential for most plants, but the underlying mechanisms are largely unknown. Here we show that adaptation to submergence induced hypoxia in Arabidopsis involves up-regulation of RAP2.2 through interactive action of WRKY33 and WRKY12. WRKY33- or WRKY12-overexpressing plants showed enhanced resistance to hypoxia. Y2H, BiFC, Co-IP and pull-down experiments confirmed the interaction of WRKY33 with WRKY12. Genetic experiments showed that RAP2.2 acts downstream of WRKY33/WRKY12. WRKY33 and WRKY12 can bind to and activate RAP2.2 individually. Genetic and molecular experiments demonstrate that the two WRKYs can synergistically enhance activation towards RAP2.2 to increase hypoxia tolerance. WRKY33 expression is increased in RAP2.2-overexpressing plants, indicating a feedback regulation by RAP2.2 during submergence process, which was corroborated by EMSA, ChIP, dual-LUC and genetic experiments. Our results show that a regulatory cascade module involving WRKY33, WRKY12 and RAP2.2 plays a key role in submergence induced hypoxia response of Arabidopsis and illuminate functions of WRKYs in hypoxia tolerance.
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Affiliation(s)
- Hu Tang
- Key Laboratory for Bio-resources and Eco-environment, College of Life Science, Sichuan University, Chengdu, 610065, China
| | - Hao Bi
- Key Laboratory for Bio-resources and Eco-environment, College of Life Science, Sichuan University, Chengdu, 610065, China
| | - Bao Liu
- Key Laboratory for Bio-resources and Eco-environment, College of Life Science, Sichuan University, Chengdu, 610065, China
| | - Shangling Lou
- Key Laboratory for Bio-resources and Eco-environment, College of Life Science, Sichuan University, Chengdu, 610065, China
| | - Yan Song
- Key Laboratory for Bio-resources and Eco-environment, College of Life Science, Sichuan University, Chengdu, 610065, China
| | - Shaofei Tong
- Key Laboratory for Bio-resources and Eco-environment, College of Life Science, Sichuan University, Chengdu, 610065, China
| | - Ningning Chen
- Key Laboratory for Bio-resources and Eco-environment, College of Life Science, Sichuan University, Chengdu, 610065, China
| | - Yuanzhong Jiang
- Key Laboratory for Bio-resources and Eco-environment, College of Life Science, Sichuan University, Chengdu, 610065, China
| | - Jianquan Liu
- Key Laboratory for Bio-resources and Eco-environment, College of Life Science, Sichuan University, Chengdu, 610065, China
| | - Huanhuan Liu
- Key Laboratory for Bio-resources and Eco-environment, College of Life Science, Sichuan University, Chengdu, 610065, China
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17
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Bai H, Si H, Zang J, Pang X, Yu L, Cao H, Xing J, Zhang K, Dong J. Comparative Proteomic Analysis of the Defense Response to Gibberella Stalk Rot in Maize and Reveals That ZmWRKY83 Is Involved in Plant Disease Resistance. FRONTIERS IN PLANT SCIENCE 2021; 12:694973. [PMID: 34489999 PMCID: PMC8417113 DOI: 10.3389/fpls.2021.694973] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 07/21/2021] [Indexed: 05/12/2023]
Abstract
Fusarium graminearum is the causal agent of Gibberella stalk rot in maize stem, resulting in maize lodging, yield, quality, and mechanical harvesting capacity. To date, little is known about the maize stem defense mechanism in response to the invasion of F. graminearum. This study represents a global proteomic approach to document the infection by F. graminearum. A total of 1,894 differentially expressed proteins (DEPs) were identified in maize stem with F. graminearum inoculation. Functional categorization analysis indicated that proteins involved in plant-pathogen interaction were inducible at the early stages of infection. We also found that the expression of proteins involved in phenylpropanoid, flavonoid, and terpenoid biosynthesis were upregulated in response to F. graminearum infection, which may reflect that these secondary metabolism pathways were important in the protection against the fungal attack in maize stem. In continuously upregulated proteins after F. graminearum infection, we identified a WRKY transcription factor, ZmWRKY83, which could improve the resistance to plant pathogens. Together, the results show that the defense response of corn stalks against F. graminearum infection was multifaceted, involving the induction of proteins from various immune-related pathways, which had a directive significance for molecular genetic breeding of maize disease-resistant varieties.
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Affiliation(s)
- Hua Bai
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
- College of Life Sciences, Hebei Agricultural University, Baoding, China
| | - Helong Si
- Hebei Key Laboratory of Plant Physiology and Molecular Pathology, Hebei Agricultural University, Baoding, China
- College of Life Sciences, Hebei Agricultural University, Baoding, China
| | - Jinping Zang
- Hebei Key Laboratory of Plant Physiology and Molecular Pathology, Hebei Agricultural University, Baoding, China
- College of Life Sciences, Hebei Agricultural University, Baoding, China
| | - Xi Pang
- College of Life Sciences, Hebei Agricultural University, Baoding, China
| | - Lu Yu
- College of Life Sciences, Hebei Agricultural University, Baoding, China
| | - Hongzhe Cao
- Hebei Key Laboratory of Plant Physiology and Molecular Pathology, Hebei Agricultural University, Baoding, China
- College of Life Sciences, Hebei Agricultural University, Baoding, China
| | - Jihong Xing
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
- Hebei Key Laboratory of Plant Physiology and Molecular Pathology, Hebei Agricultural University, Baoding, China
- College of Life Sciences, Hebei Agricultural University, Baoding, China
- *Correspondence: Jihong Xing,
| | - Kang Zhang
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
- Hebei Key Laboratory of Plant Physiology and Molecular Pathology, Hebei Agricultural University, Baoding, China
- College of Life Sciences, Hebei Agricultural University, Baoding, China
- Kang Zhang,
| | - Jingao Dong
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
- Hebei Key Laboratory of Plant Physiology and Molecular Pathology, Hebei Agricultural University, Baoding, China
- College of Plant Protection, Hebei Agricultural University, Baoding, China
- Jingao Dong,
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18
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Li C, Cao S, Wang K, Lei C, Ji N, Xu F, Jiang Y, Qiu L, Zheng Y. Heat Shock Protein HSP24 Is Involved in the BABA-Induced Resistance to Fungal Pathogen in Postharvest Grapes Underlying an NPR1-Dependent Manner. FRONTIERS IN PLANT SCIENCE 2021; 12:646147. [PMID: 33763101 PMCID: PMC7984168 DOI: 10.3389/fpls.2021.646147] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2020] [Accepted: 02/08/2021] [Indexed: 05/02/2023]
Abstract
Although heat shock proteins (HSPs), a family of ubiquitous molecular chaperones, are well characterized in heat stress-related responses, their function in plant defense remains largely unclear. Here, we report the role of VvHSP24, a class B HSP from Vitis vinifera, in β-aminobutyric acid (BABA)-induced priming defense against the necrotrophic fungus Botrytis cinerea in grapes. Grapes treated with 10 mmol L-1 BABA exhibited transiently increased transcript levels of VvNPR1 and several SA-inducible genes, including PR1, PR2, and PR5. Additionally, phytoalexins accumulated upon inoculation with the gray mold fungus B. cinerea, which coincided with the action of a priming mode implicated in pathogen-driven resistance. Intriguingly, electrophoretic mobility shift (EMSA), yeast two-hybrid (Y2H) and His pull-down assays demonstrated that the nuclear chaperone VvHSP24 cannot modulate the transcript of PR genes but does directly interact with VvNPR1 in vivo or in vitro. Furthermore, we found that VvHSP24 overexpression enhanced the transcript levels of NPR1 and SA-responsive genes (PR1, PR2, and PR5) and increased the resistance of transgenic Arabidopsis thaliana to B. cinerea compared with wildtype Col-0. An opposite trend between CRISPR mutants of AtHSFB1 (the orthologous gene of VvHSP24 in Arabidopsis) and wildtype plants was observed. Hence, our results suggest that VvHSP24 has a potential role in NPR1-dependent plant resistance to fungal pathogen. BABA-induced priming defense in grapes may require posttranslational modification of the chaperone VvHSP24 to activate VvNPR1 transcript, leading to PR gene expressions and resistance phenotypes.
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Affiliation(s)
- Chunhong Li
- College of Life and Food Engineering, Chongqing Three Gorges University, Chongqing, China
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Shifeng Cao
- College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo, China
| | - Kaituo Wang
- College of Life and Food Engineering, Chongqing Three Gorges University, Chongqing, China
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, China
- *Correspondence: Kaituo Wang,
| | - Changyi Lei
- College of Life and Food Engineering, Chongqing Three Gorges University, Chongqing, China
| | - Nana Ji
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Feng Xu
- College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
| | - Yongbo Jiang
- College of Life and Food Engineering, Chongqing Three Gorges University, Chongqing, China
| | - Linglan Qiu
- College of Life and Food Engineering, Chongqing Three Gorges University, Chongqing, China
| | - Yonghua Zheng
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, China
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19
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Sharma M, Sudheer S, Usmani Z, Rani R, Gupta P. Deciphering the Omics of Plant-Microbe Interaction: Perspectives and New Insights. Curr Genomics 2020; 21:343-362. [PMID: 33093798 PMCID: PMC7536805 DOI: 10.2174/1389202921999200515140420] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 03/29/2020] [Accepted: 04/17/2020] [Indexed: 12/19/2022] Open
Abstract
Introduction Plants do not grow in isolation, rather they are hosts to a variety of microbes in their natural environments. While, few thrive in the plants for their own benefit, others may have a direct impact on plants in a symbiotic manner. Unraveling plant-microbe interactions is a critical component in recognizing the positive and negative impacts of microbes on plants. Also, by affecting the environment around plants, microbes may indirectly influence plants. The progress in sequencing technologies in the genomics era and several omics tools has accelerated in biological science. Studying the complex nature of plant-microbe interactions can offer several strategies to increase the productivity of plants in an environmentally friendly manner by providing better insights. This review brings forward the recent works performed in building omics strategies that decipher the interactions between plant-microbiome. At the same time, it further explores other associated mutually beneficial aspects of plant-microbe interactions such as plant growth promotion, nitrogen fixation, stress suppressions in crops and bioremediation; as well as provides better insights on metabolic interactions between microbes and plants through omics approaches. It also aims to explore advances in the study of Arabidopsis as an important avenue to serve as a baseline tool to create models that help in scrutinizing various factors that contribute to the elaborate relationship between plants and microbes. Causal relationships between plants and microbes can be established through systematic gnotobiotic experimental studies to test hypotheses on biologically derived interactions. Conclusion This review will cover recent advances in the study of plant-microbe interactions keeping in view the advantages of these interactions in improving nutrient uptake and plant health.
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Affiliation(s)
- Minaxi Sharma
- 1Department of Food Technology, ACA, Eternal University, Baru Sahib (173001), Himachal Pradesh, India; 2Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu, Estonia; 3Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn12612, Estonia; 4Applied Microbiology Laboratory, Department of Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, India
| | - Surya Sudheer
- 1Department of Food Technology, ACA, Eternal University, Baru Sahib (173001), Himachal Pradesh, India; 2Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu, Estonia; 3Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn12612, Estonia; 4Applied Microbiology Laboratory, Department of Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, India
| | - Zeba Usmani
- 1Department of Food Technology, ACA, Eternal University, Baru Sahib (173001), Himachal Pradesh, India; 2Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu, Estonia; 3Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn12612, Estonia; 4Applied Microbiology Laboratory, Department of Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, India
| | - Rupa Rani
- 1Department of Food Technology, ACA, Eternal University, Baru Sahib (173001), Himachal Pradesh, India; 2Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu, Estonia; 3Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn12612, Estonia; 4Applied Microbiology Laboratory, Department of Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, India
| | - Pratishtha Gupta
- 1Department of Food Technology, ACA, Eternal University, Baru Sahib (173001), Himachal Pradesh, India; 2Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu, Estonia; 3Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn12612, Estonia; 4Applied Microbiology Laboratory, Department of Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, India
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20
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Wang D, Xu H, Huang J, Kong Y, AbuQamar S, Yu D, Liu S, Zhou G, Chai G. The Arabidopsis CCCH protein C3H14 contributes to basal defense against Botrytis cinerea mainly through the WRKY33-dependent pathway. PLANT, CELL & ENVIRONMENT 2020; 43:1792-1806. [PMID: 32279333 DOI: 10.1111/pce.13771] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Revised: 03/15/2020] [Accepted: 04/04/2020] [Indexed: 06/11/2023]
Abstract
Necrotrophic pathogens such as Botrytis cinerea cause significant crop yield losses. Plant CCCH proteins play important roles in pathogen resistance responses. However, the CCCH-mediated defense mechanisms against necrotrophic pathogens are unclear. Here, we report that the Arabidopsis CCCH protein C3H14 positively regulates basal defense against B. cinerea mainly by WRKY33 signaling. Simultaneous mutation of C3H14 and its paralog C3H15 resulted in enhanced susceptibility to B. cinerea, while C3H14 or C3H15 overexpression lines exhibited reduced susceptibility. A large number of differentially expressed genes (DEGs) were present in the c3h14c3h15 double mutant and C3H14 overexpression plants compared with wild-type plants at 24 hr post infection. These DEGs covered over one third of B. cinerea-responsive WRKY33 targets, including genes involved in jasmonic acid (JA)/ethylene (ET) signaling, and camalexin biosynthesis. Genetic analysis indicated that C3H14 mainly depended on WRKY33 to modulate defense against B. cinerea. Moreover, C3H14 activated the WRKY33-ORA59 and -PAD3 cascades to correspondingly control JA/ET- and camalexin-mediated defense responses. However, C3H14 was essential for B. cinerea-induced production of 12-oxo-phytodienoic acid and it also directly mediated ORA59-dependent JA/ET signaling after infection. Therefore, C3H14 may act as a novel transcriptional regulator of the WRKY33-mediated defense pathway.
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Affiliation(s)
- Dian Wang
- Key Laboratory of Biofuels, Chinese Academy of Sciences, Qingdao Institute of BioEnergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China
- College of Agronomy, Qingdao Agricultural University, Qingdao, China
| | - Hua Xu
- Key Laboratory of Biofuels, Chinese Academy of Sciences, Qingdao Institute of BioEnergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China
| | - Junyan Huang
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Wuhan, China
| | - Yingzhen Kong
- College of Agronomy, Qingdao Agricultural University, Qingdao, China
| | - Synan AbuQamar
- Department of Biology, United Arab Emirates University, Al-Ain, United Arab Emirates
| | - Diqiu Yu
- Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, China
| | - Shengyi Liu
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Wuhan, China
| | - Gongke Zhou
- Key Laboratory of Biofuels, Chinese Academy of Sciences, Qingdao Institute of BioEnergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China
| | - Guohua Chai
- Key Laboratory of Biofuels, Chinese Academy of Sciences, Qingdao Institute of BioEnergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China
- College of Resources and Environment, Qingdao Agricultural University, Qingdao, China
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21
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Schroeder MM, Lai Y, Shirai M, Alsalek N, Tsuchiya T, Roberts P, Eulgem T. A novel Arabidopsis pathosystem reveals cooperation of multiple hormonal response-pathways in host resistance against the global crop destroyer Macrophomina phaseolina. Sci Rep 2019; 9:20083. [PMID: 31882671 PMCID: PMC6934584 DOI: 10.1038/s41598-019-56401-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 12/02/2019] [Indexed: 11/08/2022] Open
Abstract
Dubbed as a "global destroyer of crops", the soil-borne fungus Macrophomina phaseolina (Mp) infects more than 500 plant species including many economically important cash crops. Host defenses against infection by this pathogen are poorly understood. We established interactions between Mp and Arabidopsis thaliana (Arabidopsis) as a model system to quantitatively assess host factors affecting the outcome of Mp infections. Using agar plate-based infection assays with different Arabidopsis genotypes, we found signaling mechanisms dependent on the plant hormones ethylene, jasmonic acid and salicylic acid to control host defense against this pathogen. By profiling host transcripts in Mp-infected roots of the wild-type Arabidopsis accession Col-0 and ein2/jar1, an ethylene/jasmonic acid-signaling deficient mutant that exhibits enhanced susceptibility to this pathogen, we identified hundreds of genes potentially contributing to a diverse array of defense responses, which seem coordinated by complex interplay between multiple hormonal response-pathways. Our results establish Mp/Arabidopsis interactions as a useful model pathosystem, allowing for application of the vast genomics-related resources of this versatile model plant to the systematic investigation of previously understudied host defenses against a major crop plant pathogen.
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Affiliation(s)
- Mercedes M Schroeder
- Center for Plant Cell Biology, Institute of Integrative Genome Biology, Department of Botany and Plant Sciences, University of California, Riverside, Riverside, California, United States of America
| | - Yan Lai
- Center for Plant Cell Biology, Institute of Integrative Genome Biology, Department of Botany and Plant Sciences, University of California, Riverside, Riverside, California, United States of America
- College of Life Sciences, Fujian Agricultural and Forestry University, Fuzhou, Fujian, China
| | - Miwa Shirai
- Center for Plant Cell Biology, Institute of Integrative Genome Biology, Department of Botany and Plant Sciences, University of California, Riverside, Riverside, California, United States of America
| | - Natalie Alsalek
- Center for Plant Cell Biology, Institute of Integrative Genome Biology, Department of Botany and Plant Sciences, University of California, Riverside, Riverside, California, United States of America
- School of Pharmacy, University of California, San Francisco, San Francisco, California, United States of America
| | - Tokuji Tsuchiya
- College of Bioresource Sciences, Nihon University, Kanagawa, Japan
| | - Philip Roberts
- Institute of Integrative Genome Biology, Department of Nematology, University of California, Riverside, Riverside, California, United States of America
| | - Thomas Eulgem
- Center for Plant Cell Biology, Institute of Integrative Genome Biology, Department of Botany and Plant Sciences, University of California, Riverside, Riverside, California, United States of America.
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22
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Sham A, Al-Ashram H, Whitley K, Iratni R, El-Tarabily KA, AbuQamar SF. Metatranscriptomic Analysis of Multiple Environmental Stresses Identifies RAP2.4 Gene Associated with Arabidopsis Immunity to Botrytis cinerea. Sci Rep 2019; 9:17010. [PMID: 31740741 PMCID: PMC6861241 DOI: 10.1038/s41598-019-53694-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 10/24/2019] [Indexed: 01/18/2023] Open
Abstract
In this study, we aimed to identify common genetic components during stress response responsible for crosstalk among stresses, and to determine the role of differentially expressed genes in Arabidopsis-Botrytis cinerea interaction. Of 1,554 B. cinerea up-regulated genes, 24%, 1.4% and 14% were induced by biotic, abiotic and hormonal treatments, respectively. About 18%, 2.5% and 22% of B. cinerea down-regulated genes were also repressed by the same stress groups. Our transcriptomic analysis indicates that plant responses to all tested stresses can be mediated by commonly regulated genes; and protein-protein interaction network confirms the cross-interaction between proteins regulated by these genes. Upon challenges to individual or multiple stress(es), accumulation of signaling molecules (e.g. hormones) plays a major role in the activation of downstream defense responses. In silico gene analyses enabled us to assess the involvement of RAP2.4 (related to AP2.4) in plant immunity. Arabidopsis RAP2.4 was repressed by B. cinerea, and its mutants enhanced resistance to the same pathogen. To the best of our knowledge, this is the first report demonstrating the role of RAP2.4 in plant defense against B. cinerea. This research can provide a basis for breeding programs to increase tolerance and improve yield performance in crops.
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Affiliation(s)
- Arjun Sham
- Department of Biology, United Arab Emirates University, 15551, Al-Ain, UAE
| | | | - Kenna Whitley
- Department of Biology, United Arab Emirates University, 15551, Al-Ain, UAE
| | - Rabah Iratni
- Department of Biology, United Arab Emirates University, 15551, Al-Ain, UAE
| | - Khaled A El-Tarabily
- Department of Biology, United Arab Emirates University, 15551, Al-Ain, UAE. .,School of Veterinary and Life Sciences, Murdoch University, Murdoch, Western Australia, 6150, Australia.
| | - Synan F AbuQamar
- Department of Biology, United Arab Emirates University, 15551, Al-Ain, UAE.
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23
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Kulkarni SR, Jones DM, Vandepoele K. Enhanced Maps of Transcription Factor Binding Sites Improve Regulatory Networks Learned from Accessible Chromatin Data. PLANT PHYSIOLOGY 2019; 181:412-425. [PMID: 31345953 PMCID: PMC6776849 DOI: 10.1104/pp.19.00605] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Accepted: 07/12/2019] [Indexed: 05/05/2023]
Abstract
Determining where transcription factors (TFs) bind in genomes provides insight into which transcriptional programs are active across organs, tissue types, and environmental conditions. Recent advances in high-throughput profiling of regulatory DNA have yielded large amounts of information about chromatin accessibility. Interpreting the functional significance of these data sets requires knowledge of which regulators are likely to bind these regions. This can be achieved by using information about TF-binding preferences, or motifs, to identify TF-binding events that are likely to be functional. Although different approaches exist to map motifs to DNA sequences, a systematic evaluation of these tools in plants is missing. Here, we compare four motif-mapping tools widely used in the Arabidopsis (Arabidopsis thaliana) research community and evaluate their performance using chromatin immunoprecipitation data sets for 40 TFs. Downstream gene regulatory network (GRN) reconstruction was found to be sensitive to the motif mapper used. We further show that the low recall of Find Individual Motif Occurrences, one of the most frequently used motif-mapping tools, can be overcome by using an Ensemble approach, which combines results from different mapping tools. Several examples are provided demonstrating how the Ensemble approach extends our view on transcriptional control for TFs active in different biological processes. Finally, a protocol is presented to effectively derive more complete cell type-specific GRNs through the integrative analysis of open chromatin regions, known binding site information, and expression data sets. This approach will pave the way to increase our understanding of GRNs in different cellular conditions.
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Affiliation(s)
- Shubhada R Kulkarni
- Ghent University, Department of Plant Biotechnology and Bioinformatics, 9052 Ghent, Belgium
- VIB Center for Plant Systems Biology, 9052 Ghent, Belgium
- Bioinformatics Institute Ghent, Ghent University, 9052 Ghent, Belgium
| | - D Marc Jones
- Ghent University, Department of Plant Biotechnology and Bioinformatics, 9052 Ghent, Belgium
- VIB Center for Plant Systems Biology, 9052 Ghent, Belgium
- Bioinformatics Institute Ghent, Ghent University, 9052 Ghent, Belgium
| | - Klaas Vandepoele
- Ghent University, Department of Plant Biotechnology and Bioinformatics, 9052 Ghent, Belgium
- VIB Center for Plant Systems Biology, 9052 Ghent, Belgium
- Bioinformatics Institute Ghent, Ghent University, 9052 Ghent, Belgium
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24
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Haile ZM, Nagpala-De Guzman EG, Moretto M, Sonego P, Engelen K, Zoli L, Moser C, Baraldi E. Transcriptome Profiles of Strawberry ( Fragaria vesca) Fruit Interacting With Botrytis cinerea at Different Ripening Stages. FRONTIERS IN PLANT SCIENCE 2019; 10:1131. [PMID: 31620156 PMCID: PMC6759788 DOI: 10.3389/fpls.2019.01131] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Accepted: 08/15/2019] [Indexed: 05/04/2023]
Abstract
Gray mold caused by Botrytis cinerea is a major cause of economic losses in strawberry fruit production, limiting fruit shelf life and commercialization. When the fungus infects Fragaria × ananassa strawberry at flowering or unripe fruit stages, symptoms develop after an extended latent phase on ripe fruits before or after harvesting. To elucidate the growth kinetics of B. cinerea on flower/fruit and the molecular responses associated with low susceptibility of unripe fruit stages, woodland strawberry Fragaria vesca flowers and fruits, at unripe white and ripe red stages, were inoculated with B. cinerea. Quantification of fungal genomic DNA within 72 h postinoculation (hpi) showed limited fungal growth on open flower and white fruit, while on red fruit, the growth was exponential starting from 24 hpi and sporulation was observed within 48 hpi. RNA sequencing applied to white and red fruit at 24 hpi showed that a total of 2,141 genes (12.5% of the total expressed genes) were differentially expressed due to B. cinerea infection. A broad transcriptional reprogramming was observed in both unripe and ripe fruits, involving in particular receptor and signaling, secondary metabolites, and defense response pathways. Membrane-localized receptor-like kinases and nucleotide-binding site leucine-rich repeat genes were predominant in the surveillance system of the fruits, most of them being downregulated in white fruits and upregulated in red fruits. In general, unripe fruits exhibited a stronger defense response than red fruits. Genes encoding for pathogenesis-related proteins and flavonoid polyphenols as well as genes involved in cell-wall strengthening were upregulated, while cell-softening genes appeared to be switched off. As a result, B. cinerea remained quiescent in white fruits, while it was able to colonize ripe red fruits.
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Affiliation(s)
- Zeraye Mehari Haile
- Laboratory of Biotechnology and Plant Pathology, DISTAL, University of Bologna, Bologna, Italy
- Plant Protection Research Division of Melkasa Agricultural Research Center, Ethiopian Institute of Agricultural Research (EIAR), Addis Ababa, Ethiopia
- Genomics and Biology of Fruit Crops Department, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all’Adige, Italy
| | | | - Marco Moretto
- Unit of Computational Biology, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all’Adige, Italy
| | - Paolo Sonego
- Unit of Computational Biology, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all’Adige, Italy
| | - Kristof Engelen
- ESAT-ELECTA, Electrical Energy and Computer Architectures, Leuven, Belgium
| | - Lisa Zoli
- Laboratory of Biotechnology and Plant Pathology, DISTAL, University of Bologna, Bologna, Italy
| | - Claudio Moser
- Genomics and Biology of Fruit Crops Department, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all’Adige, Italy
| | - Elena Baraldi
- Laboratory of Biotechnology and Plant Pathology, DISTAL, University of Bologna, Bologna, Italy
- *Correspondence: Elena Baraldi,
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25
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CRISPR/Cas9-Mediated Multiplex Genome Editing of the BnWRKY11 and BnWRKY70 Genes in Brassica napus L. Int J Mol Sci 2018; 19:ijms19092716. [PMID: 30208656 PMCID: PMC6163266 DOI: 10.3390/ijms19092716] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 08/26/2018] [Accepted: 09/07/2018] [Indexed: 02/04/2023] Open
Abstract
Targeted genome editing is a desirable means of basic science and crop improvement. The clustered, regularly interspaced, palindromic repeat (CRISPR)/Cas9 (CRISPR-associated 9) system is currently the simplest and most commonly used system in targeted genomic editing in plants. Single and multiplex genome editing in plants can be achieved under this system. In Arabidopsis, AtWRKY11 and AtWRKY70 genes were involved in JA- and SA-induced resistance to pathogens, in rapeseed (Brassica napus L.), BnWRKY11 and BnWRKY70 genes were found to be differently expressed after inoculated with the pathogenic fungus, Sclerotinia sclerotiorum (Lib.) de Bary. In this study, two Cas9/sgRNA constructs targeting two copies of BnWRKY11 and four copies of BnWRKY70 were designed to generate BnWRKY11 and BnWRKY70 mutants respectively. As a result, twenty-two BnWRKY11 and eight BnWRKY70 independent transformants (T0) were obtained, with the mutation ratios of 54.5% (12/22) and 50% (4/8) in BnWRKY11 and BnWRKY70 transformants respectively. Eight and two plants with two copies of mutated BnWRKY11 and BnWRKY70 were obtained respectively. In T1 generation of each plant examined, new mutations on target genes were detected with high efficiency. The vast majority of BnWRKY70 mutants showed editing in three copies of BnWRKY70 in examined T1 plants. BnWRKY70 mutants exhibited enhanced resistance to Sclerotinia, while BnWRKY11 mutants showed no significant difference in Sclerotinia resistance when compared to non-transgenic plants. In addition, plants that overexpressed BnWRKY70 showed increased sensitivity when compared to non-transgenic plants. Altogether, our results demonstrated that BnWRKY70 may function as a regulating factor to negatively control the Sclerotinia resistance and CRISPR/Cas9 system could be used to generate germplasm in B. napus with high resistance against Sclerotinia.
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Chen Y, Ren Y, Zhang G, An J, Yang J, Wang Y, Wang W. Overexpression of the wheat expansin gene TaEXPA2 improves oxidative stress tolerance in transgenic Arabidopsis plants. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2018; 124:190-198. [PMID: 29414315 DOI: 10.1016/j.plaphy.2018.01.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 01/20/2018] [Accepted: 01/22/2018] [Indexed: 05/02/2023]
Abstract
Expansins play an important role in plant stress tolerance. In a previous study, we cloned the wheat expansin gene TaEXPA2. Here, we analyze its involvement in oxidative stress tolerance. First, we observed that the expression of TaEXPA2 in wheat seedlings was upregulated during H2O2 stress. Then, we assembled a TaEXPA2 gene expression vector, transformed it to Arabidopsis, and obtained transgenic plants overexpressing TaEXPA2 (labeled OE). When exposed to H2O2, both OE and wild-type (Col) plants were damaged by oxidative stress, as indicated by decolored leaves and increased malondialdehyde (MDA) content. Damage in OE plants was less severe than in Col plants (WT), and this was accompanied by higher activity of cell wall peroxidase (POD) enzymes, including soluble POD, ionically bound POD, and covalently bound POD. The expansin activities of the OE plants were also higher than WT under oxidative stress. We further obtained the Arabidopsis mutant atexpa2 (AtEXPA2 is homologous to TaEXPA2), and found that the antioxidant ability of atexpa2 was lower than that in Col plants, accompanied by depressed activity of POD enzymes and expansins in cell walls. We transformed wheat TaEXPA2 to atexpa2 and obtained plants (labeled Rs) capable of recovering the antioxidant capacity. Oxidative stress tolerance in Rs plants was higher than that of Col plants, and the Rs plants also had higher levels of cell wall POD enzyme and expansin activity. Finally, we identified 13 POD genes in Arabidopsis thaliana and analyzed their expression patterns using quantitative real-time PCR. The expression of 4 of these genes (AtPOD31, AtPOD33, AtPOD34 and AtPOD71) was significantly upregulated during exposure to H2O2. We speculate that the 4 genes upregulated by H2O2 treatment are involved in the increased activity of POD in the cell wall. We suggest that TaEXPA2 may regulate antioxidant capacity in plants by regulating the activity of cell wall peroxidase.
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Affiliation(s)
- Yanhui Chen
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, PR China; Research Institute of Pomology of Chinese Academy of Agricultural Sciences, Xingcheng, Liaoning 125100, PR China
| | - Yuanqing Ren
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, PR China
| | - Guangqiang Zhang
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, PR China
| | - Jie An
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, PR China
| | - Junjiao Yang
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, PR China
| | - Yong Wang
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, PR China
| | - Wei Wang
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, PR China.
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27
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Saeed EE, Sham A, AbuZarqa A, A Al Shurafa K, S Al Naqbi T, Iratni R, El-Tarabily K, F AbuQamar S. Detection and Management of Mango Dieback Disease in the United Arab Emirates. Int J Mol Sci 2017; 18:E2086. [PMID: 29053600 PMCID: PMC5666768 DOI: 10.3390/ijms18102086] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Revised: 09/28/2017] [Accepted: 09/28/2017] [Indexed: 11/20/2022] Open
Abstract
Mango is affected by different decline disorders causing significant losses to mango growers. In the United Arab Emirates (UAE), the pathogen was isolated from all tissues sampled from diseased trees affected by Lasiodiplodia theobromae. Symptoms at early stages of the disease included general wilting appearance of mango trees, and dieback of twigs. In advanced stages, the disease symptoms were also characterized by the curling and drying of leaves, leading to complete defoliation of the tree and discolouration of vascular regions of the stems and branches. To substantially reduce the devastating impact of dieback disease on mango, the fungus was first identified based on its morphological and cultural characteristics. Target regions of 5.8S rRNA (ITS) and elongation factor 1-α (EF1-α) genes of the pathogen were amplified and sequenced. We also found that the systemic chemical fungicides, Score®, Cidely® Top, and Penthiopyrad®, significantly inhibited the mycelial growth of L. theobromae both in vitro and in the greenhouse. Cidely® Top proved to be a highly effective fungicide against L. theobromae dieback disease also under field conditions. Altogether, the morphology of the fruiting structures, molecular identification and pathogenicity tests confirm that the causal agent of the mango dieback disease in the UAE is L. theobromae.
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Affiliation(s)
- Esam Eldin Saeed
- Department of Biology, United Arab Emirates University, Al-Ain 15551, UAE.
| | - Arjun Sham
- Department of Biology, United Arab Emirates University, Al-Ain 15551, UAE.
| | - Ayah AbuZarqa
- Department of Biology, United Arab Emirates University, Al-Ain 15551, UAE.
| | | | | | - Rabah Iratni
- Department of Biology, United Arab Emirates University, Al-Ain 15551, UAE.
| | - Khaled El-Tarabily
- Department of Biology, United Arab Emirates University, Al-Ain 15551, UAE.
| | - Synan F AbuQamar
- Department of Biology, United Arab Emirates University, Al-Ain 15551, UAE.
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Fujishiro A, Miura Y, Iwasa M, Fujii S, Sugino N, Andoh A, Hirai H, Maekawa T, Ichinohe T. Effects of acute exposure to low-dose radiation on the characteristics of human bone marrow mesenchymal stromal/stem cells. Inflamm Regen 2017; 37:19. [PMID: 29259718 PMCID: PMC5725824 DOI: 10.1186/s41232-017-0049-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 07/10/2017] [Indexed: 12/26/2022] Open
Abstract
Background In recent years, increasing attention has been paid to the effects of low-dose irradiation on human health. We examined whether low-dose irradiation affected the functions of mesenchymal stromal/stem cells (MSCs), which are tissue/organ-supportive stem cells, derived from bone marrow (BM). Methods Normal human BM-MSCs from five healthy individuals were used in this study. Culture-expanded BM-MSCs were exposed to 0.1 gray (Gy) of γ-radiation (Cesium-137) at a rate of 0.8 Gy/min (Ir-MSCs), and their expansion, multi-differentiation, and hematopoiesis-supportive capabilities were investigated. Results The expansion of BM-MSCs was transiently delayed after low-dose γ-irradiation compared with that of non-irradiated BM-MSCs (non-Ir-MSCs) in two out of five lots. Adipogenic and osteogenic differentiation capabilities were not significantly affected by low-dose irradiation, although one lot of BM-MSCs tended to have transiently reduced differentiation. When human BM hematopoietic stem/progenitor cells (HPCs) were co-cultured with Ir-MSCs, the generation of CD34+CD38+ cells from HPCs was enhanced compared with that in co-cultures with non-Ir-MSCs in two out of five lots. The mRNA expression level of interleukin (IL)-6 was increased and those of stem cell factor (SCF) and fms-related tyrosine kinase 3 ligand (Flt3L) were decreased in the affected lots of Ir-MSCs. In the other three lots of BM-MSCs, a cell growth delay, enhanced generation of CD34+CD38+ cells from HPCs in co-culture, and a combination of increased expression of IL-6 and decreased expression of SCF and Flt3L were not observed. Of note, the characteristics of these affected Ir-MSCs recovered to a similar level as those of non-Ir-MSCs following culture for 3 weeks. Conclusions Our results suggest that acute exposure to low-dose (0.1 Gy) radiation can transiently affect the functional characteristics of human BM-MSCs.
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Affiliation(s)
- Aya Fujishiro
- Department of Transfusion Medicine and Cell Therapy, Kyoto University Hospital, 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto, 606-8507 Japan.,Division of Gastroenterology and Hematology, Department of Medicine, Shiga University of Medical Science, Setatsukinowacho, Otsu, Shiga 520-2192 Japan
| | - Yasuo Miura
- Department of Transfusion Medicine and Cell Therapy, Kyoto University Hospital, 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto, 606-8507 Japan.,Department of Hematology and Oncology, Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minamiku, Hiroshima, 734-8553 Japan
| | - Masaki Iwasa
- Department of Transfusion Medicine and Cell Therapy, Kyoto University Hospital, 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto, 606-8507 Japan.,Division of Gastroenterology and Hematology, Department of Medicine, Shiga University of Medical Science, Setatsukinowacho, Otsu, Shiga 520-2192 Japan
| | - Sumie Fujii
- Department of Transfusion Medicine and Cell Therapy, Kyoto University Hospital, 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto, 606-8507 Japan.,Department of Hematology/Oncology, Graduate School for Medicine, Kyoto University, 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto, 606-8507 Japan
| | - Noriko Sugino
- Department of Transfusion Medicine and Cell Therapy, Kyoto University Hospital, 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto, 606-8507 Japan.,Department of Hematology/Oncology, Graduate School for Medicine, Kyoto University, 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto, 606-8507 Japan
| | - Akira Andoh
- Division of Gastroenterology and Hematology, Department of Medicine, Shiga University of Medical Science, Setatsukinowacho, Otsu, Shiga 520-2192 Japan
| | - Hideyo Hirai
- Department of Transfusion Medicine and Cell Therapy, Kyoto University Hospital, 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto, 606-8507 Japan
| | - Taira Maekawa
- Department of Transfusion Medicine and Cell Therapy, Kyoto University Hospital, 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto, 606-8507 Japan
| | - Tatsuo Ichinohe
- Department of Hematology and Oncology, Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minamiku, Hiroshima, 734-8553 Japan
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Saeed EE, Sham A, Salmin Z, Abdelmowla Y, Iratni R, El-Tarabily K, AbuQamar S. Streptomyces globosus UAE1, a Potential Effective Biocontrol Agent for Black Scorch Disease in Date Palm Plantations. Front Microbiol 2017; 8:1455. [PMID: 28824584 PMCID: PMC5534479 DOI: 10.3389/fmicb.2017.01455] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 07/18/2017] [Indexed: 12/21/2022] Open
Abstract
Many fungal diseases affect date palm causing considerable losses in date production worldwide. We found that the fungicide Cidely® Top inhibited the mycelial growth of the soil-borne pathogenic fungus Thielaviopsis punctulata, the causal agent of black scorch disease of date palm, both in vitro and in vivo. Because the use of biocontrol agents (BCAs) can minimize the impact of pathogen control on economic and environmental concerns related to chemical control, we aimed at testing local actinomycete strains isolated from the rhizosphere soil of healthy date palm cultivated in the United Arab Emirates (UAE) against T. punctulata. The selected isolate can thus be used as a potential agent for integrated disease management programs. In general, the BCA showed antagonism in vitro and in greenhouse experiments against this pathogen. The most promising actinomycete isolate screened showed the highest efficacy against the black scorch disease when applied before or at the same time of inoculation with T. punctulata, compared with BCA or fungicide application after inoculation. The nucleotide sequence and phylogenetic analyses using the 16S ribosomal RNA gene with other Streptomyces spp. in addition to morphological and cultural characteristics revealed that the isolated UAE strain belongs to Streptomyces globosus UAE1. The antagonistic activity of S. globosus against T. punctulata, was associated with the production by this strain of diffusible antifungal metabolites i.e., metabolites that can inhibit mycelial growth of the pathogen. This was evident in the responses of the vegetative growth of pure cultures of the pathogen when exposed to the culture filtrates of the BCA. Altogether, the pathogenicity tests, disease severity indices and mode of action tests confirmed that the BCA was not only capable of suppressing black scorch disease symptoms, but also could prevent the spread of the pathogen, as a potential practical method to improve disease management in the palm plantations. This is the first report of an actinomycete, naturally occurring in the UAE with the potential for use as a BCA in the management of the black scorch disease of date palms in the region.
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Affiliation(s)
| | | | | | | | | | - Khaled El-Tarabily
- Department of Biology, United Arab Emirates UniversityAl Ain, United Arab Emirates
| | - Synan AbuQamar
- Department of Biology, United Arab Emirates UniversityAl Ain, United Arab Emirates
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