Are the polygenic architectures of resistance to Phytophthora capsici and P. parasitica independent in pepper

The pepper accession Criollo de Morelos 334 is the most efficient source of resistance currently known to Phytophthora capsici and P. parasitica. To investigate whether genetic controls of resistance to two Phytophthora species are independent, we compared the genetic architecture of resistance of C...

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Bibliographic Details
Published in:Theoretical and applied genetics 2007-07, Vol.115 (2), p.253-264
Main Authors: Bonnet, Julien, Danan, Sarah, Boudet, Christine, Barchi, Lorenzo, Sage-Palloix, Anne-Marie, Caromel, Bernard, Palloix, Alain, Lefebvre, Véronique
Format: Article
Language:English
Subjects:
Biological and medical sciences
Capsicum - genetics
Capsicum - parasitology
Chromosome Mapping
Classical genetics, quantitative genetics, hybrids
Fundamental and applied biological sciences. Psychology
Genetic Markers
Genetics
Genetics of eukaryotes. Biological and molecular evolution
Genomics
Immunity, Innate - genetics
Life Sciences
Phenotype
Phytophthora - physiology
Plant Diseases - genetics
Pteridophyta, spermatophyta
Quantitative Trait Loci
Species Specificity
Vegetals
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Summary:The pepper accession Criollo de Morelos 334 is the most efficient source of resistance currently known to Phytophthora capsici and P. parasitica. To investigate whether genetic controls of resistance to two Phytophthora species are independent, we compared the genetic architecture of resistance of CM334 to both Phytophthora species. The RIL population F5YC used to construct the high-resolution genetic linkage map of pepper was assessed for resistance to one isolate of each Phytophthora species. Inheritance of the P. capsici and P. parasitica resistance was polygenic. Twelve additive QTLs involved in the P. capsici resistance and 14 additive QTLs involved in the P. parasitica resistance were detected. The QTLs identified in this progeny were specific to these Phytophthora species. Comparative mapping analysis with literature data identified three colocations between resistance QTLs to P. parasitica and P. capsici in pepper. Whereas this result suggests presence of common resistance factors to the two Phytophthora species in pepper, which possibly derive from common ancestral genes, calculation of the colocation probability indicates that these colocations could occur by chance.
ISSN:0040-5752
1432-2242
DOI:10.1007/s00122-007-0561-x