Quantitative Trait Loci Associated with Isolate Specific Resistanceto Phytophthora Root Rot in Pepper (Capsicum annuum L.)
Summary: Phytophthora root rot caused by Phytophthora capsici Leon., is the major disease that limits pepper production in the world. Quantitative trait loci (QTLs) implicated in resistance to two Korean isolates of P. capsici. (09-051 and 07-125) were investigated using 126 recombinant inbred lines (RILs) from the cross between C. annuum YCM334 (resistant parent) and ‘Tean’ (susceptible parent). The experimental design was a split-plot in completely randomized block with two replications. QTL mapping was performed using a recently developed high-density SSR/AFLP pepper linkage map, which covered 1486.6 cM of the pepper genome and consisted of 249 markers including 136 AFLPs, 112 SSRs, and 1 CAPS, and distributed over 18 linkage groups (LGs). Fifteen QTLs were detected on chromosomes 5 (LG5), 10 (LG10), 11 (LG11), LGb and LGc using two processed data, percentage of wilted plants (PWP) and relative area under the disease progress curves (RAUDPC). The phenotypic variation explained by each QTL (R2) ranged from 6.0 to 48.2%. Seven QTLs were common to resistance for the two isolates on chromosome 5 (LG5), six are isolate-specific for isolate 09-051 on chromosome 10 (LG10) and LGc, and two for isolate 07-127 on choromosome 11 (LG11) and LGb. The QTL in common is that with the major effect on the resistance for two isolates, explaining 20.0% to 48.2% of phenotypic variation. The isolate-specific QTLs explained 6.0% to 17.4% of phenotypic variation and confirm gene-for-gene relationship between C. annuum and P. capsici for root rot resistance
Type: Non-ISI/SCOPUS listed journals with ISSB/ISBN
Author: Trương Thị Hồng Hải, KT. Kim, DW. Kim, JH. Park
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Journal:Korean Journal Horticulture Science Technology
Issue, Number, Pages28, Supply I, 85
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Year of publication: 2010
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