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Characterization of two recessive genes controlling resistance to all races of bacterial spot in peppers
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Characterization of two recessive genes controlling resistance to all races of bacterial spot in peppers
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Characterization of two recessive genes controlling resistance to all races of bacterial spot in peppers
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Journal Article
Characterization of two recessive genes controlling resistance to all races of bacterial spot in peppers
2010
Overview
Bacterial spot, one of the most damaging diseases of pepper, is caused by Xanthomonas euvesicatoria. This pathogen has worldwide distribution and it is particularly devastating in tropical and sub-tropical regions where high temperatures and frequent precipitation provide ideal conditions for disease development. Three dominant resistance genes have been deployed singly and in combination in commercial cultivars, but have been rendered ineffectual by the high mutation rate or deletion of the corresponding cognate effector genes. These genes are missing in race P6, and their absence makes this race virulent on all commercial pepper cultivars. The breeding line ECW12346 is the only source of resistance to race P6 in Capsicum annuum, and displays a non-hypersensitive type of resistance. Characterization of this resistance has identified two recessive genes: bs5 and bs6. Individual analysis of these genes revealed that bs5 confers a greater level of resistance than bs6 at 25°C, but in combination they confer full resistance to P6 indicating at least additive gene action. Tests carried out at 30°C showed that both resistances are compromised to a significant extent, but in combination they provide almost full resistance to race P6 indicating a positive epistatic interaction at high temperatures. A scan of the pepper genome with restriction fragment length polymorphism and AFLP markers led to the identification of a set of AFLP markers for bs5. Allele-specific primers for a PCR-based bs5-marker have been developed to facilitate the genetic manipulation of this gene.
Publisher
Berlin/Heidelberg : Springer-Verlag,Springer-Verlag,Springer,Springer Nature B.V
Subject
/ amplified fragment length polymorphism
/ Amplified Fragment Length Polymorphism Analysis
/ Bacteria
/ Bacterial diseases of plants
/ Biological and medical sciences
/ Biomedical and Life Sciences
/ breeding
/ Capsicum
/ Classical genetics, quantitative genetics, hybrids
/ Fundamental and applied biological sciences. Psychology
/ genetics
/ Genetics of eukaryotes. Biological and molecular evolution
/ pepper
/ Peppers
/ Plant Breeding/Biotechnology
/ Plant Diseases - microbiology
/ races
/ restriction fragment length polymorphism
/ Vegetals
