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Chandan RK, Kumar R, Kabyashree K, Yadav SK, Roy M, Swain DM, Jha G. A prophage tail-like protein facilitates the endophytic growth of Burkholderia gladioli and mounting immunity in tomato. New Phytol 2023; 240:1202-1218. [PMID: 37559429 DOI: 10.1111/nph.19184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Accepted: 07/19/2023] [Indexed: 08/11/2023]
Abstract
A prophage tail-like protein (Bg_9562) of Burkholderia gladioli strain NGJ1 possesses broad-spectrum antifungal activity, and it is required for the bacterial ability to forage over fungi. Here, we analyzed whether heterologous overexpression of Bg_9562 or exogenous treatment with purified protein can impart disease tolerance in tomato. The physiological relevance of Bg_9562 during endophytic growth of NGJ1 was also investigated. Bg_9562 overexpressing lines demonstrate fungal and bacterial disease tolerance. They exhibit enhanced expression of defense genes and activation of mitogen-activated protein kinases. Treatment with Bg_9562 protein induces defense responses and imparts immunity in wild-type tomato. The defense-inducing ability lies within 18-51 aa region of Bg_9562 and is due to sequence homology with the bacterial flagellin epitope. Interaction studies suggest that Bg_9562 is perceived by FLAGELLIN-SENSING 2 homologs in tomato. The silencing of SlSERK3s (BAK1 homologs) prevents Bg_9562-triggered immunity. Moreover, type III secretion system-dependent translocation of Bg_9562 into host apoplast is important for elicitation of immune responses during colonization of NGJ1. Our study emphasizes that Bg_9562 is important for the endophytic growth of B. gladioli, while the plant perceives it as an indirect indicator of the presence of bacteria to mount immune responses. The findings have practical implications for controlling plant diseases.
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Affiliation(s)
- Ravindra Kumar Chandan
- Plant-Microbe Interactions Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Rahul Kumar
- Plant-Microbe Interactions Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Kristi Kabyashree
- Plant-Microbe Interactions Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Sunil Kumar Yadav
- Plant-Microbe Interactions Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Mandira Roy
- Plant-Microbe Interactions Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Durga Madhab Swain
- Plant-Microbe Interactions Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Gopaljee Jha
- Plant-Microbe Interactions Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
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2
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Osakina A, Jia Y. Genetic Diversity of Weedy Rice and Its Potential Application as a Novel Source of Disease Resistance. Plants (Basel) 2023; 12:2850. [PMID: 37571004 PMCID: PMC10421194 DOI: 10.3390/plants12152850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 07/13/2023] [Accepted: 07/28/2023] [Indexed: 08/13/2023]
Abstract
Weeds that infest crops are a primary factor limiting agricultural productivity worldwide. Weedy rice, also called red rice, has experienced independent evolutionary events through gene flow from wild rice relatives and de-domestication from cultivated rice. Each evolutionary event supplied/equipped weedy rice with competitive abilities that allowed it to thrive with cultivated rice and severely reduce yields in rice fields. Understanding how competitiveness evolves is important not only for noxious agricultural weed management but also for the transfer of weedy rice traits to cultivated rice. Molecular studies of weedy rice using simple sequence repeat (SSR), restriction fragment length polymorphism (RFLP), and whole-genome sequence have shown great genetic variations in weedy rice populations globally. These variations are evident both at the whole-genome and at the single-allele level, including Sh4 (shattering), Hd1 (heading and flowering), and Rc (pericarp pigmentation). The goal of this review is to describe the genetic diversity of current weedy rice germplasm and the significance of weedy rice germplasm as a novel source of disease resistance. Understanding these variations, especially at an allelic level, is also crucial as individual loci that control important traits can be of great target to rice breeders.
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Affiliation(s)
- Aron Osakina
- Department of Biology, Washington University in St. Louis, St. Louis, MO 63130, USA;
- USDA ARS Dale Bumpers National Rice Research Center, Stuttgart, AR 72160, USA
| | - Yulin Jia
- USDA ARS Dale Bumpers National Rice Research Center, Stuttgart, AR 72160, USA
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Chandan RK, Kumar R, Swain DM, Ghosh S, Bhagat PK, Patel S, Bagler G, Sinha AK, Jha G. RAV1 family members function as transcriptional regulators and play a positive role in plant disease resistance. Plant J 2023; 114:39-54. [PMID: 36703574 DOI: 10.1111/tpj.16114] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 01/14/2023] [Accepted: 01/18/2023] [Indexed: 06/18/2023]
Abstract
Phytopathogens pose a severe threat to agriculture and strengthening the plant defense response is an important strategy for disease control. Here, we report that AtRAV1, an AP2 and B3 domain-containing transcription factor, is required for basal plant defense in Arabidopsis thaliana. The atrav1 mutant lines demonstrate hyper-susceptibility against fungal pathogens (Rhizoctonia solani and Botrytis cinerea), whereas AtRAV1 overexpressing lines exhibit disease resistance against them. Enhanced expression of various defense genes and activation of mitogen-activated protein kinases (AtMPK3 and AtMPK6) are observed in the R. solani infected overexpressing lines, but not in the atrav1 mutant plants. An in vitro phosphorylation assay suggests AtRAV1 to be a novel phosphorylation target of AtMPK3. Bimolecular fluorescence complementation and yeast two-hybrid assays support physical interactions between AtRAV1 and AtMPK3. Overexpression of the native as well as phospho-mimic but not the phospho-defective variant of AtRAV1 imparts disease resistance in the atrav1 mutant A. thaliana lines. On the other hand, overexpression of AtRAV1 fails to impart disease resistance in the atmpk3 mutant. These analyses emphasize that AtMPK3-mediated phosphorylation of AtRAV1 is important for the elaboration of the defense response in A. thaliana. Considering that RAV1 homologs are conserved in diverse plant species, we propose that they can be gainfully deployed to impart disease resistance in agriculturally important crop plants. Indeed, overexpression of SlRAV1 (a member of the RAV1 family) imparts disease tolerance against not only fungal (R. solani and B. cinerea), but also against bacterial (Ralstonia solanacearum) pathogens in tomato, whereas silencing of the gene enhances disease susceptibility.
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Affiliation(s)
- Ravindra Kumar Chandan
- Plant Microbe Interactions Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
- School of Life Sciences, Central University of Gujarat, Sector-30, Gandhinagar, 382030, India
| | - Rahul Kumar
- Plant Microbe Interactions Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Durga Madhab Swain
- Plant Microbe Interactions Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Srayan Ghosh
- Plant Microbe Interactions Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Prakash Kumar Bhagat
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Sunita Patel
- School of Life Sciences, Central University of Gujarat, Sector-30, Gandhinagar, 382030, India
| | - Ganesh Bagler
- Centre for Computational Biology, Indraprastha Institute of Information Technology (IIIT-Delhi), New Delhi, 110020, India
| | - Alok Krishna Sinha
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Gopaljee Jha
- Plant Microbe Interactions Lab, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067, India
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4
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Feng T, Zhang ZY, Gao P, Feng ZM, Zuo SM, Ouyang SQ. Suppression of Rice Osa-miR444.2 Improves the Resistance to Sheath Blight in Rice Mediating through the Phytohormone Pathway. Int J Mol Sci 2023; 24:ijms24043653. [PMID: 36835070 PMCID: PMC9963240 DOI: 10.3390/ijms24043653] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 02/03/2023] [Accepted: 02/09/2023] [Indexed: 02/17/2023] Open
Abstract
MicroRNAs (miRNAs) are a class of conserved small RNA with a length of 21-24 nucleotides in eukaryotes, which are involved in development and defense responses against biotic and abiotic stresses. By RNA-seq, Osa-miR444b.2 was identified to be induced after Rhizoctonia solani (R. solani) infection. In order to clarify the function of Osa-miR444b.2 responding to R. solani infection in rice, transgenic lines over-expressing and knocking out Osa-miR444b.2 were generated in the background of susceptible cultivar Xu3 and resistant cultivar YSBR1, respectively. Over-expressing Osa-miR444b.2 resulted in compromised resistance to R. solani. In contrast, the knocking out Osa-miR444b.2 lines exhibited improved resistance to R. solani. Furthermore, knocking out Osa-miR444b.2 resulted in increased height, tillers, smaller panicle, and decreased 1000-grain weight and primary branches. However, the transgenic lines over-expressing Osa-miR444b.2 showed decreased primary branches and tillers, but increased panicle length. These results indicated that Osa-miR444b.2 was also involved in regulating the agronomic traits in rice. The RNA-seq assay revealed that Osa-miR444b.2 mainly regulated the resistance to rice sheath blight disease by affecting the expression of plant hormone signaling pathways-related genes such as ET and IAA, and transcription factors such as WRKYs and F-boxes. Together, our results suggest that Osa-miR444b.2 negatively mediated the resistance to R. solani in rice, which will contribute to the cultivation of sheath blight resistant varieties.
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Affiliation(s)
- Tao Feng
- College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China
| | - Zhao-Yang Zhang
- College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China
| | - Peng Gao
- Key Laboratory of Plant Functional Genomics of the Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, Agricultural College, Yangzhou University, Yangzhou 225009, China
| | - Zhi-Ming Feng
- Key Laboratory of Plant Functional Genomics of the Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, Agricultural College, Yangzhou University, Yangzhou 225009, China
| | - Shi-Min Zuo
- Key Laboratory of Plant Functional Genomics of the Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, Agricultural College, Yangzhou University, Yangzhou 225009, China
| | - Shou-Qiang Ouyang
- College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China
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5
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Miao Liu J, Mei Q, Yun Xue C, Yuan Wang Z, Pin Li D, Xin Zhang Y, Hu Xuan Y. Mutation of G-protein γ subunit DEP1 increases planting density and resistance to sheath blight disease in rice. Plant Biotechnol J 2021; 19:418-420. [PMID: 33098731 PMCID: PMC7955884 DOI: 10.1111/pbi.13500] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 09/12/2020] [Indexed: 05/05/2023]
Affiliation(s)
- Jing Miao Liu
- Department of Agricultural and Biological TechnologyWenzhou Agricultural Science Research Institute (Wenzhou Vocational College of Science & Technology)WenzhouChina
| | - Qiong Mei
- College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Cai Yun Xue
- College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Zi Yuan Wang
- College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Dao Pin Li
- Department of Agricultural and Biological TechnologyWenzhou Agricultural Science Research Institute (Wenzhou Vocational College of Science & Technology)WenzhouChina
| | - Yong Xin Zhang
- Department of Agricultural and Biological TechnologyWenzhou Agricultural Science Research Institute (Wenzhou Vocational College of Science & Technology)WenzhouChina
| | - Yuan Hu Xuan
- College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
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Kim P, Xue CY, Song HD, Gao Y, Feng L, Li Y, Xuan YH. Tissue-specific activation of DOF11 promotes rice resistance to sheath blight disease and increases grain weight via activation of SWEET14. Plant Biotechnol J 2021; 19:409-411. [PMID: 33047500 PMCID: PMC7955873 DOI: 10.1111/pbi.13489] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 09/28/2020] [Accepted: 10/01/2020] [Indexed: 05/03/2023]
Affiliation(s)
- Pyol Kim
- Key Laboratory of Saline‐alkali Vegetation Ecology RestorationMinistry of Education (Northeast Forestry University)HarbinChina
| | - Cai Yun Xue
- College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Hyon Dok Song
- Key Laboratory of Saline‐alkali Vegetation Ecology RestorationMinistry of Education (Northeast Forestry University)HarbinChina
| | - Yue Gao
- College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Lu Feng
- College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Yuhua Li
- Key Laboratory of Saline‐alkali Vegetation Ecology RestorationMinistry of Education (Northeast Forestry University)HarbinChina
| | - Yuan Hu Xuan
- College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
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Ghosh S, Kant R, Pradhan A, Jha G. RS_CRZ1, a C2H2-Type Transcription Factor Is Required for Pathogenesis of Rhizoctonia solani AG1-IA in Tomato. Mol Plant Microbe Interact 2021; 34:26-38. [PMID: 33030394 DOI: 10.1094/mpmi-05-20-0121-r] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Rhizoctonia solani is a necrotrophic fungal pathogen that causes disease in diverse plant species. In recent years, the genomic and transcriptomic studies have identified several candidate pathogenicity determinants of R. solani; however, most of them remain to be validated. In this study, we report a viral vector-based host-induced gene silencing (HIGS) as well as a dsRNA (double-stranded RNA)-based approach to effectively downregulate genes of R. solani AG1-IA (BRS1 strain) during pathogenesis in tomato. We tested a few of the in-planta upregulated R. solani genes and observed that silencing of one of them, i.e., RS_CRZ1 (a C2H2 type zinc finger transcription factor) significantly compromises the pathogenesis of R. solani in tomato. The RS_CRZ1-silenced plants not only exhibited significant reduction in disease symptoms, but the depth of pathogen colonization was also compromised. Furthermore, we identified the R. solani genes that were coregulated with RS_CRZ1 during the pathogenicity process. The HIGS-mediated silencing of a few of them [CL1756Contig1; subtilisin-like protease and CL1817Contig2; 2OG-Fe(II) oxygenase] compromised the pathogenesis of R. solani in tomato. The ectopic expression of RS_CRZ1 complemented the crz1 mutant of yeast and restored tolerance against various metal ion stress. Overall, our study reveals the importance of RS_CRZ1 in managing the hostile environment encountered during host colonization. Also, it emphasizes the relevance of the HIGS and dsRNA-based gene silencing approach toward functional characterization of pathogenicity determinants of R. solani.[Formula: see text] Copyright © 2021 The Author(s). This is an open access article distributed under the CC BY 4.0 International license.
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Affiliation(s)
- Srayan Ghosh
- Plant Microbe Interactions Laboratory, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Ravi Kant
- Plant Microbe Interactions Laboratory, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Amrita Pradhan
- Plant Microbe Interactions Laboratory, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Gopaljee Jha
- Plant Microbe Interactions Laboratory, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
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Sun Q, Li TY, Li DD, Wang ZY, Li S, Li DP, Han X, Liu JM, Xuan YH. Overexpression of Loose Plant Architecture 1 increases planting density and resistance to sheath blight disease via activation of PIN-FORMED 1a in rice. Plant Biotechnol J 2019; 17:855-857. [PMID: 30623557 PMCID: PMC6594025 DOI: 10.1111/pbi.13072] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2018] [Revised: 11/27/2018] [Accepted: 12/05/2018] [Indexed: 05/18/2023]
Affiliation(s)
- Qian Sun
- College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Tian Ya Li
- College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Dan Dan Li
- College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Zi Yuan Wang
- College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Shuang Li
- College of Life ScienceYan'an UniversityYan'anShaanxiChina
| | - Dao Pin Li
- Department of Agricultural and Biological TechnologyWenZhou Agricultural Science Research Institute (WenZhou Vocational College of Science &Technology)WenzhouChina
| | - Xiao Han
- College of Biological Science and EngineeringFuzhou UniversityFuzhouChina
| | - Jing Miao Liu
- Department of Agricultural and Biological TechnologyWenZhou Agricultural Science Research Institute (WenZhou Vocational College of Science &Technology)WenzhouChina
| | - Yuan Hu Xuan
- College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
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Gao Y, Zhang C, Han X, Wang ZY, Ma L, Yuan DP, Wu JN, Zhu XF, Liu JM, Li DP, Hu YB, Xuan YH. Inhibition of OsSWEET11 function in mesophyll cells improves resistance of rice to sheath blight disease. Mol Plant Pathol 2018; 19:2149-2161. [PMID: 29660235 PMCID: PMC6638089 DOI: 10.1111/mpp.12689] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2018] [Revised: 04/04/2018] [Accepted: 04/08/2018] [Indexed: 05/20/2023]
Abstract
Pathogen-host interaction is a complicated process; pathogens mainly infect host plants to acquire nutrients, especially sugars. Rhizoctonia solani, the causative agent of sheath blight disease, is a major pathogen of rice. However, it is not known how this pathogen obtains sugar from rice plants. In this study, we found that the rice sugar transporter OsSWEET11 is involved in the pathogenesis of sheath blight disease. Quantitative real-time polymerase chain reaction (qRT-PCR) and β-d-glucuronidase expression analyses showed that R. solani infection significantly enhanced OsSWEET11 expression in leaves amongst the clade III SWEET members. The analyses of transgenic plants revealed that Ossweet11 mutants were less susceptible, whereas plants overexpressing OsSWEET11 were more susceptible, to sheath blight compared with wild-type controls, but the yield of OsSWEET11 mutants and overexpressors was reduced. SWEETs become active on oligomerization. Split-ubiquitin yeast two-hybrid, bimolecular fluorescence complementation and co-immunoprecipitation assays showed that mutated OsSWEET11 interacted with normal OsSWEET11. In addition, expression of conserved residue mutated AtSWEET1 inhibited normal AtSWEET1 activity. To analyse whether inhibition of OsSWEET11 function in mesophyll cells is related to defence against this disease, mutated OsSWEET11 was expressed under the control of the Rubisco promoter, which is specific for green tissues. The resistance of transgenic plants to sheath blight disease, but not other disease, was improved, whereas yield production was not obviously affected. Overall, these results suggest that R. solani might acquire sugar from rice leaves by the activation of OsSWEET11 expression. The plants can be protected from infection by manipulation of the expression of OsSWEET11 without affecting the crop yield.
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Affiliation(s)
- Yue Gao
- College of Plant ProtectionShenyang Agricultural UniversityShenyang 110866China
| | - Chong Zhang
- College of Plant ProtectionShenyang Agricultural UniversityShenyang 110866China
| | - Xiao Han
- College of Biological Science and EngineeringFuzhou UniversityFuzhou 350108China
- Biotechnology Research InstituteChinese Academy of Agricultural SciencesBeijing 100081China
| | - Zi Yuan Wang
- College of Plant ProtectionShenyang Agricultural UniversityShenyang 110866China
| | - Lai Ma
- College of Resources & Environmental SciencesNanjing Agricultural UniversityNanjing 210095China
| | - De Peng Yuan
- College of Plant ProtectionShenyang Agricultural UniversityShenyang 110866China
| | - Jing Ni Wu
- Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of SciencesShanghai 200032China
| | - Xiao Feng Zhu
- College of Plant ProtectionShenyang Agricultural UniversityShenyang 110866China
| | - Jing Miao Liu
- Department of Agricultural and Biological TechnologyWenzhou Agricultural Science Research Institute (Wenzhou Vocational College of Science & Technology)Wenzhou 325006China
| | - Dao Pin Li
- Department of Agricultural and Biological TechnologyWenzhou Agricultural Science Research Institute (Wenzhou Vocational College of Science & Technology)Wenzhou 325006China
| | - Yi Bing Hu
- College of Resources & Environmental SciencesNanjing Agricultural UniversityNanjing 210095China
| | - Yuan Hu Xuan
- College of Plant ProtectionShenyang Agricultural UniversityShenyang 110866China
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Li N, Wei S, Chen J, Yang F, Kong L, Chen C, Ding X, Chu Z. OsASR2 regulates the expression of a defence-related gene, Os2H16, by targeting the GT-1 cis-element. Plant Biotechnol J 2018; 16:771-783. [PMID: 28869785 PMCID: PMC5814579 DOI: 10.1111/pbi.12827] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 08/23/2017] [Indexed: 05/11/2023]
Abstract
The GT-1 cis-element widely exists in many plant gene promoters. However, the molecular mechanism that underlies the response of the GT-1 cis-element to abiotic and biotic stresses remains elusive in rice. We previously isolated a rice short-chain peptide-encoding gene, Os2H16, and demonstrated that it plays important roles in both disease resistance and drought tolerance. Here, we conducted a promoter assay of Os2H16 and identified GT-1 as an important cis-element that mediates Os2H16 expression in response to pathogen attack and osmotic stress. Using the repeated GT-1 as bait, we characterized an abscisic acid, stress and ripening 2 (ASR2) protein from yeast-one hybridization screening. Sequence alignments showed that the carboxy-terminal domain of OsASR2 containing residues 80-138 was the DNA-binding domain. Furthermore, we identified that OsASR2 was specifically bound to GT-1 and activated the expression of the target gene Os2H16, as well as GFP driven by the chimeric promoter of 2 × GT-1-35S mini construct. Additionally, the expression of OsASR2 was elevated by pathogens and osmotic stress challenges. Overexpression of OsASR2 enhanced the resistance against Xanthomonas oryzae pv. oryzae and Rhizoctonia solani, and tolerance to drought in rice. These results suggest that the interaction between OsASR2 and GT-1 plays an important role in the crosstalk of the response of rice to biotic and abiotic stresses.
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Affiliation(s)
- Ning Li
- State Key Laboratory of Crop BiologyCollege of AgronomyShandong Agricultural UniversityTaianShandongChina
| | - Shutong Wei
- Shandong Provincial Key Laboratory for Biology of Vegetable Disease and Insect PestsCollege of Plant ProtectionShandong Agricultural UniversityTaianShandongChina
| | - Jing Chen
- Shandong Provincial Key Laboratory for Biology of Vegetable Disease and Insect PestsCollege of Plant ProtectionShandong Agricultural UniversityTaianShandongChina
| | - Fangfang Yang
- State Key Laboratory of Crop BiologyCollege of AgronomyShandong Agricultural UniversityTaianShandongChina
| | - Lingguang Kong
- Shandong Provincial Key Laboratory for Biology of Vegetable Disease and Insect PestsCollege of Plant ProtectionShandong Agricultural UniversityTaianShandongChina
| | - Cuixia Chen
- State Key Laboratory of Crop BiologyCollege of AgronomyShandong Agricultural UniversityTaianShandongChina
| | - Xinhua Ding
- State Key Laboratory of Crop BiologyCollege of AgronomyShandong Agricultural UniversityTaianShandongChina
- Shandong Provincial Key Laboratory for Biology of Vegetable Disease and Insect PestsCollege of Plant ProtectionShandong Agricultural UniversityTaianShandongChina
| | - Zhaohui Chu
- State Key Laboratory of Crop BiologyCollege of AgronomyShandong Agricultural UniversityTaianShandongChina
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Abstract
Fungal pathogens are responsible for approximately two third of the infectious plant diseases. Historically they have been associated with several devastating famines, causing death and disabilities in humans. Mostly fungal diseases are being controlled by using fungicides which otherwise have adverse side effects on the health of consumers as well as environment. Due to extensive usages, pathogens have evolved resistance against most of the commonly used fungicides and rendered them ineffective. Controlling fungal disease in a sustainable and eco-friendly fashion remains a challenge. The antifungal biocontrol agents are being considered as potent, alternative and ecofriendly approach to manage fungal diseases. In our recent work, we have identified a rice associated bacterium; Burkholderia gladioli strain NGJ1 which demonstrates broad spectrum fungal eating (mycophagous) property. We determined that the bacterium utilizes its type III secretion system (Injectisome) machinery to deploy a prophage tail-like protein (Bg_9562) into fungal cells to devour them. The purified Bg_9562 protein from over-expressing recombinant E. coli strain demonstrates broad spectrum antifungal activity. Overall our study opens up a new opportunity to exploit prophage tail-like protein as potent antifungal compound to control plant as well as animal fungal diseases.
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Affiliation(s)
- Rahul Kumar
- Plant Microbe Interactions Laboratory, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Sunil Kumar Yadav
- Plant Microbe Interactions Laboratory, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Durga M Swain
- Plant Microbe Interactions Laboratory, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Gopaljee Jha
- Plant Microbe Interactions Laboratory, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi-110067, India
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