1
|
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.
Collapse
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
| |
Collapse
|
2
|
Szabó Z, Balogh M, Domonkos Á, Csányi M, Kaló P, Kiss GB. The bs5 allele of the susceptibility gene Bs5 of pepper (Capsicum annuum L.) encoding a natural deletion variant of a CYSTM protein conditions resistance to bacterial spot disease caused by Xanthomonas species. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2023; 136:64. [PMID: 36943531 PMCID: PMC10030403 DOI: 10.1007/s00122-023-04340-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 03/02/2023] [Indexed: 05/09/2023]
Abstract
KEY MESSAGE The bs5 resistance gene against bacterial spot was identified by map-based cloning. The recessive bs5 gene of pepper (Capsicum annuum L.) conditions a non-hypersensitive resistance trait, characterized by a slightly swollen, pale green, photosynthetically active leaf tissue, following Xanthomonas euvesicatoria infection. The isolation of the bs5 gene by map-based cloning revealed that the bs5 protein was shorter by 2 amino acids as compared to the wild type Bs5 protein. The natural 2 amino acid deletion occurred in the cysteine-rich transmembrane domain of the tail-anchored (TA) protein, Ca_CYSTM1. The protein products of the wild type Bs5 and mutant bs5 genes were shown to be located in the cell membrane, indicating an unknown function in this membrane compartment. Successful infection of the Bs5 pepper lines was abolished by the 6 bp deletion in the TM encoding domain of the Ca_CYSTM1 gene in bs5 homozygotes, suggesting, that the resulting resistance might be explained by the lack of entry of the Xanthomonas specific effector molecules into the plant cells.
Collapse
Affiliation(s)
- Zoltán Szabó
- Institute of Genetics and Biotechnology, Hungarian University of Agriculture and Life Sciences, Szent-Györgyi A. U. 4., 2100, Gödöllő, Hungary.
| | - Márta Balogh
- Institute of Genetics and Biotechnology, Hungarian University of Agriculture and Life Sciences, Szent-Györgyi A. U. 4., 2100, Gödöllő, Hungary
| | - Ágota Domonkos
- Institute of Genetics and Biotechnology, Hungarian University of Agriculture and Life Sciences, Szent-Györgyi A. U. 4., 2100, Gödöllő, Hungary
| | - Márta Csányi
- Institute of Genetics and Biotechnology, Hungarian University of Agriculture and Life Sciences, Szent-Györgyi A. U. 4., 2100, Gödöllő, Hungary
| | - Péter Kaló
- Institute of Genetics and Biotechnology, Hungarian University of Agriculture and Life Sciences, Szent-Györgyi A. U. 4., 2100, Gödöllő, Hungary
- Institute of Plant Biology, Biological Research Center, Eötvös Lóránd Research Network, Szeged, Hungary
| | - György B Kiss
- Institute of Genetics and Biotechnology, Hungarian University of Agriculture and Life Sciences, Szent-Györgyi A. U. 4., 2100, Gödöllő, Hungary
- AMBIS Biotechnology Research and Development Ltd., Budapest, Hungary
| |
Collapse
|