Smart Christine D, Tanksley Steven D, Mayton Hilary, Fry William E
Department of Plant Pathology, Cornell University, Geneva, NY 14456.
Department of Plant Breeding and Genetics.
Plant Dis. 2007 Aug;91(8):1045-1049. doi: 10.1094/PDIS-91-8-1045.
To determine if the desert tomato, Lycopersicon pennellii, possesses resistance to late blight, caused by Phytophthora infestans, two plant populations were analyzed. Resistance was identified through assessments of disease progress in an F2 mapping population (L. esculentum × L. pennellii) and in a series of introgression lines (L. pennellii into L. esculentum). Levels of resistance varied widely among individuals within each population. However, the response of individuals to different strains of P. infestans was consistent. In the mapping population, a quantitative trait locus (QTL) was detected near marker T1556 on chromosome 6. This QTL accounted for 25% of the phenotypic variance in the population. The occurrence of this QTL was confirmed from analysis of the introgression lines (ILs), where IL 6-2 (containing marker T1556) was the most resistant IL in 2002 and the second most resistant IL in 2001. The identification of an additional QTL for resistance to late blight in tomato will aid in the development of durable resistance to this devastating disease.
为了确定野生番茄（潘那利番茄，Lycopersicon pennellii）是否对由致病疫霉（Phytophthora infestans）引起的晚疫病具有抗性，对两个植株群体进行了分析。通过评估F2作图群体（栽培番茄L. esculentum×潘那利番茄L. pennellii）和一系列渐渗系（潘那利番茄渐渗到栽培番茄中）的病情进展来鉴定抗性。每个群体内个体间的抗性水平差异很大。然而，个体对不同致病疫霉菌株的反应是一致的。在作图群体中，在6号染色体上标记T1556附近检测到一个数量性状基因座（QTL）。该QTL占群体表型变异的25%。通过对渐渗系（ILs）的分析证实了该QTL的存在，其中IL 6-2（含有标记T1556）在2002年是抗性最强的渐渗系，在2001年是第二抗性最强的渐渗系。鉴定番茄中另一个抗晚疫病的QTL将有助于培育对这种毁灭性病害的持久抗性。
