Despite the negative impact of common scab (Streptomyces spp.) to the potato industry, little is known about the genetic architecture of resistance to this bacterial disease in the crop. We evaluated a mapping population (~150 full-sibs) derived from a cross between two tetraploid potatoes ('Atlantic' × B1829-5) in three environments (MN11, PA11, ME12) under natural common scab pressure. Three measures to common scab reaction were assessed, namely percentage of scabby tubers, and disease area and lesion indices, which were highly correlated (>0.76). Due to large environmental effect, heritability values were zero for all three traits in MN11, but moderate to high in PA11 and ME12 (0.44~0.79). We identified a single quantitative trait locus (QTL) for lesion index in PA11, ME12 and joint analyses on linkage group 3, explaining 22~30% of the total variation. The identification of QTL haplotypes and candidate genes contributing to disease resistance can support genomics-assisted breeding approaches.

中文翻译：

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四倍体马铃薯全同胞种群中常见的抗ab疮病性状的数量性状位点作图

尽管常见sc有负面影响（链霉菌spp。）对马铃薯工业来说，对作物中这种细菌性疾病的抗性遗传结构知之甚少。我们评估了在自然常见sc疮压力下，在三种环境（MN11，PA11，ME12）中，两个四倍体马铃薯（“ Atlantic”×B1829-5）之间杂交产生的作图种群（约150个全同胞）。评估了三种常见sc疮反应的测量指标，即疮块茎的百分率，疾病面积和病变指数均高度相关（> 0.76）。由于较大的环境影响，MN11的所有三个性状的遗传力值为零，而PA11和ME12的遗传力值为中度至高（0.44〜0.79）。我们为PA11，ME12中的病变指数鉴定了一个单一的数量性状基因座（QTL），并在连锁群3上进行了联合分析，解释了总变异的22％至30％。