John Innes Centre, Colney, Norwich, NR4 7UH, UK.
Mol Plant Pathol. 2013 Oct;14(8):828-37. doi: 10.1111/mpp.12043. Epub 2013 Jun 3.
Segregation of partial resistance to Pseudomonas syringae pv. maculicola (Psm) ES4326 was studied in the recombinant inbred population created from accessions (ecotypes) Columbia (Col-4), the more susceptible parent, and Landsberg (Ler-0). Plants were spray inoculated with lux-transformed bacteria in experiments to measure susceptibility. The amount of disease produced on a range of Col × Ler lines by spray inoculation was highly correlated with that produced by pressure infiltration of bacteria into the apoplast. Quantitative trait locus (QTL) analysis identified four loci that contributed to partial resistance: QRpsJIC-1.1, QRpsJIC-2.1, QRpsJIC-3.1 and QRpsJIC-5.1 on chromosomes 1, 2, 3 and 5, respectively. QRpsJIC-3.1, located 8.45 cM from the top of the consensus genetic map of chromosome 3, had a large, approximately additive effect on partial resistance, explaining 50% of the genetic variation in this population. Fine mapping narrowed the region within which this QTL was located to 62 genes. A list of candidate genes included several major classes of resistance gene.
对 Pseudomonas syringae pv. maculicola (Psm) ES4326 的部分抗性进行了分离,该抗性是在哥伦比亚(Col-4)和兰德斯堡(Ler-0)这两个亲本之间的重组自交系群体中研究的。在测量易感性的喷雾接种实验中,用 lux 转化细菌对植物进行喷雾接种。通过喷雾接种在一系列 Col × Ler 系上产生的病害量与将细菌压渗到质外体中产生的病害量高度相关。数量性状位点(QTL)分析确定了四个有助于部分抗性的基因座:位于 1 号、2 号、3 号和 5 号染色体上的 QRpsJIC-1.1、QRpsJIC-2.1、QRpsJIC-3.1 和 QRpsJIC-5.1。位于 3 号染色体共识遗传图谱顶部 8.45 cM 处的 QRpsJIC-3.1 对部分抗性具有较大的、大约加性效应,解释了该群体中 50%的遗传变异。精细作图将该 QTL 所在的区域缩小到 62 个基因内。候选基因列表包括几类主要的抗性基因。