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首页> 外文期刊>American Journal of Potato Research >Multiple-Site Identification of Potato Parent Clones Conferring High Levels of Late Blight Resistance with a Corresponding Genetic Model for Resistance
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Multiple-Site Identification of Potato Parent Clones Conferring High Levels of Late Blight Resistance with a Corresponding Genetic Model for Resistance

机译：多站点鉴定马铃薯高水平晚疫病抗性的克隆及相应的抗性遗传模型

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摘要

Toluca Valley, Mexico, is the putative center of origin and diversity for Phytophthora infestans (Mont.) de Bary, the oomycete pathogen responsible for late blight, making it an ideal location for screening potato breeding populations for late blightresistance. Approximately 21,500 progeny from the USDA-ARS, Aberdeen, Idaho potato breeding program were evaluated from 1996 through 2005 by estimating the percentage of defoliation due to late blight throughout the growing season. Comparisons of the number of resistant progeny and their degree of resistance response from resistant x susceptible (RxS) and resistant x resistant (RxR) crosses were made across years. A clone of each progeny planted in Toluca Valley was also planted the same year near Aberdeen, Idaho, to screen for acceptable tuber type. Promising progeny phenotypes were then screened the following year for tuber late blight resistance at field plots near Corvallis, Oregon. The RxR late blight crosses produced 64% resistant progeny compared to 29% of the RxS crosses. The segregation for late blight resistance in progeny from specific RxS crosses best fits a 1R:3S ratio. This segregation ratio is best explained by a gene model in which resistance is conferred by the presence of a dominantalíele at each of two loci. The greater percentage of resistant progeny from RxR crosses indicates the benefits of pyramiding resistance genes from diverse germplasm. Three promising late blight resistant parental clones with acceptable tuber type resulted from family A95053. Family A95053 has multiple sources of resistance that include Solatium demissum and Solarium stoloniferum, via female parent AWN86514-2 and male parent, B0718-3.
机译：墨西哥的托卢卡谷（Toluca Valley）是造成晚疫病的卵菌病原菌疫霉菌（Monty）Phytophthora infestans（Mont。）de Bary的公认起源和多样性中心，使其成为筛选马铃薯抗晚疫病种群的理想地点。通过估算整个生长季晚疫病造成的落叶比例，从1996年到2005年评估了USDA-ARS，阿伯丁，爱达荷州马铃薯育种计划的约21,500个后代。多年来比较了抗性子代的数量及其对抗性x易感性（RxS）和抗性x抗性（RxR）杂交的抗性响应程度。同年，在爱达荷州阿伯丁附近也种植了种植在托卢卡谷地的每个后代的克隆，以筛选可接受的块茎类型。第二年，在俄勒冈州科瓦利斯附近的田间地块块茎晚疫病抗性中筛选出了有前途的后代表型。 RxR晚疫病杂交产生了64％的抗性子代，而RxS杂交则为29％。特定RxS杂交后代中晚疫病抗性的分离最适合1R：3S比率。这种分离比率最好由一个基因模型来解释，在该基因模型中，两个基因座中每个基因座都存在显性基因，从而赋予抗性。来自RxR杂交的抗性子代的百分比更高，表明来自不同种质的金字塔抗性基因的好处。三个有希望的晚疫病抗性亲本克隆具有可接受的块茎类型，来自家庭A95053。 A95053家族有多种抗药性来源，通过雌性亲本AWN86514-2和雄性亲本B0718-3来获得日光梭菌和日光温室。

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