Phytopathology. 2014 May;104(5):479-83. doi: 10.1094/PHYTO-05-13-0143-R.
Phytophthora capsici is an important pepper (Capsicum annuum) pathogen causing fruit and root rot, and foliar blight in field and greenhouse production. Previously, an F6 recombinant inbred line population was evaluated for fruit rot susceptibility. Continuous variation among lines and partial and isolate-specific resistance were found. In this study, Phytophthora fruit rot resistance was mapped in the same F6 population between Criollo del Morelos 334 (CM334), a landrace from Mexico, and 'Early Jalapeno' using a high-density genetic map. Isolate-specific resistance was mapped independently in 63 of the lines evaluated and the two parents. Heritability of the resistance for each isolate at 3 and 5 days postinoculation (dpi) was high (h(2) = 0.63 to 0.68 and 0.74 to 0.83, respectively). Significant additive and epistatic quantitative trait loci (QTL) were identified for resistance to isolates OP97 and 13709 (3 and 5 dpi) and 12889 (3 dpi only). Mapping of fruit traits showed potential linkage with few disease resistance QTL. The partial fruit rot resistance from CM334 suggests that this may not be an ideal source for fruit rot resistance in pepper.
辣椒疫霉是一种重要的辣椒（Capsicum annuum）病原菌，可导致田间和温室生产中的果实和根腐病以及叶片枯萎病。此前，曾对 F6 重组自交系群体进行了果实腐烂易感性评估。结果发现，各系之间存在连续的变异以及部分和专化性的抗性。在这项研究中，使用高密度遗传图谱，在来自墨西哥的克里奥罗德尔莫雷洛斯 334（CM334）和‘早期 Jalapeno’之间的同一 F6 群体中，对辣椒疫霉果实腐烂抗性进行了定位。在评估的 63 个系和两个亲本中，独立地对专化性抗性进行了定位。每个分离物在接种后 3 和 5 天的抗性的遗传力（h(2)）均较高（分别为 0.63 至 0.68 和 0.74 至 0.83）。在对分离物 OP97 和 13709（3 和 5 dpi）和 12889（仅 3 dpi）的抗性鉴定中，均鉴定到了显著的加性和上位性数量性状位点（QTL）。果实性状的定位显示出与少数抗病性 QTL 的潜在连锁。CM334 的部分果实腐烂抗性表明，它可能不是辣椒果实腐烂抗性的理想来源。
