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Sharma A, Li J, Wente R, Minsavage GV, Gill US, Ortega A, Vallejos CE, Hart JP, Staskawicz BJ, Mazourek MR, Stall RE, Jones JB, Hutton SF. Mapping of the bs5 and bs6 non-race-specific recessive resistances against bacterial spot of pepper. FRONTIERS IN PLANT SCIENCE 2023; 14:1061803. [PMID: 37275256 PMCID: PMC10235544 DOI: 10.3389/fpls.2023.1061803] [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: 10/05/2022] [Accepted: 03/22/2023] [Indexed: 06/07/2023]
Abstract
Bacterial spot caused by Xanthomonas euvesicatoria is a major disease of pepper (Capsicum annuum L.) in warm and humid production environments. Use of genetically resistant cultivars is an effective approach to manage bacterial spot. Two recessive resistance genes, bs5 and bs6, confer non-race-specific resistance against bacterial spot. The objective of our study was to map these two loci in the pepper genome. We used a genotyping-by-sequencing approach to initially map the position of the two resistances. Segregating populations for bs5 and bs6 were developed by crossing susceptible Early CalWonder (ECW) with near-isogenic lines ECW50R (bs5 introgression) or ECW60R (bs6 introgression). Following fine-mapping, bs5 was delimited to a ~535 Kbp interval on chromosome 3, and bs6 to a ~666 Kbp interval in chromosome 6. We identified 14 and 8 candidate resistance genes for bs5 and bs6, respectively, based on predicted protein coding polymorphisms between ECW and the corresponding resistant parent. This research enhances marker-assisted selection of bs5 and bs6 in breeding programs and is a crucial step towards elucidating the molecular mechanisms underlying the resistances.
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Affiliation(s)
- Anuj Sharma
- Department of Plant Pathology, University of Florida, Gainesville, FL, United States
| | - Jian Li
- Gulf Coast Research and Education Center, University of Florida, Wimauma, FL, United States
- Horticultural Sciences Department, University of Florida, Gainesville, FL, United States
| | - Rebecca Wente
- Gulf Coast Research and Education Center, University of Florida, Wimauma, FL, United States
- Horticultural Sciences Department, University of Florida, Gainesville, FL, United States
| | - Gerald V. Minsavage
- Department of Plant Pathology, University of Florida, Gainesville, FL, United States
| | - Upinder S. Gill
- Gulf Coast Research and Education Center, University of Florida, Wimauma, FL, United States
- Horticultural Sciences Department, University of Florida, Gainesville, FL, United States
| | - Arturo Ortega
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, CA, United States
- Innovative Genomics Institute, University of California, Berkeley, Berkeley, CA, United States
| | - C. Eduardo Vallejos
- Horticultural Sciences Department, University of Florida, Gainesville, FL, United States
| | - John P. Hart
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, United States
| | - Brian J. Staskawicz
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, CA, United States
- Innovative Genomics Institute, University of California, Berkeley, Berkeley, CA, United States
| | - Michael R. Mazourek
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, United States
| | - Robert E. Stall
- Department of Plant Pathology, University of Florida, Gainesville, FL, United States
| | - Jeffrey B. Jones
- Department of Plant Pathology, University of Florida, Gainesville, FL, United States
| | - Samuel F. Hutton
- Gulf Coast Research and Education Center, University of Florida, Wimauma, FL, United States
- Horticultural Sciences Department, University of Florida, Gainesville, FL, United States
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Bozsó Z, Krüzselyi D, Szatmári Á, Csilléry G, Szarka J, Ott PG. Two Non-Necrotic Disease Resistance Types Distinctly Affect the Expression of Key Pathogenic Determinants of Xanthomonas euvesicatoria in Pepper. PLANTS (BASEL, SWITZERLAND) 2022; 12:89. [PMID: 36616218 PMCID: PMC9824575 DOI: 10.3390/plants12010089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 12/19/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
Pepper (Capsicum annuum L.) carrying the gds (corresponding to bs5) gene can prevent the development of bacterial leaf spot disease without HR. However, little is known regarding the development of the resistance mechanism encoded by gds, especially its influence on the bacterium. Here, the effect of gds was compared with pattern-triggered immunity (PTI), another form of asymptomatic resistance, to reveal the interactions and differences between these two defense mechanisms. The level of resistance was examined by its effect on the bacterial growth and in planta expression of the stress and pathogenicity genes of Xanthomonas euvesicatoria. PTI, which was activated with a Pseudomonas syringae hrcC mutant pretreatment, inhibited the growth of Xanthomonas euvesicatoria to a greater extent than gds, and the effect was additive when PTI was activated in gds plants. The stronger influence of PTI was further supported by the expression pattern of the dpsA bacterial stress gene, which reached its highest expression level in PTI-induced plants. PTI inhibited the hrp/hrc expression, but unexpectedly, in gds plant leaves, the hrp/hrc genes were generally expressed at a higher level than in the susceptible one. These results imply that different mechanisms underlie the gds and PTI to perform the symptomless defense reaction.
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Affiliation(s)
- Zoltán Bozsó
- Plant Protection Institute, ELKH Centre for Agricultural Research, Herman Ottó Str. 15, H-1022 Budapest, Hungary
| | - Dániel Krüzselyi
- Plant Protection Institute, ELKH Centre for Agricultural Research, Herman Ottó Str. 15, H-1022 Budapest, Hungary
| | - Ágnes Szatmári
- Institute of Organic Chemistry, ELKH Research Centre for Natural Sciences, Magyar Tudósok Krt 2, H-1117 Budapest, Hungary
| | | | | | - Péter G. Ott
- Plant Protection Institute, ELKH Centre for Agricultural Research, Herman Ottó Str. 15, H-1022 Budapest, Hungary
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