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首页> 外文期刊>HortScience >Screening of Cucurbita moschata Duchesne Germplasm for Crown Rot Resistance to Floridian Isolates of Phytophthora capsici Leonian
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Screening of Cucurbita moschata Duchesne Germplasm for Crown Rot Resistance to Floridian Isolates of Phytophthora capsici Leonian

机译：辣椒疫霉分离株对冠腐病抗性冠腐病的南瓜种质筛选

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摘要

Phytophthora capsici causes seedling death, crown and root rot, fruit rot, and foliar blight on squash and pumpkins (Cucurbita spp. L.). A total of 119 C. moschata accessions, from 39 geographic locations throughout the world, and a highly susceptible butternut squash cultivar, Butterbush, were inoculated with a suspension of three highly virulent P. capsici isolates from Florida to identify resistance to crown rot. Mean disease rating (DR) of the C. moschata collection ranged from 1.4 to 5 (0 to 5 scale with 0 resistant and 5 susceptible). Potential resistant and tolerant individuals were identified in the C. moschata collection. A set of 18 PIs from the original screen were rescreened for crown rot resistance. This rescreen produced similar results as the original screen (r = 0.55, P = 0.01). The accessions PI 176531, PI 458740, PI 442266, PI 442262, and PI 634693 were identified with lowest rates of crown infection with a mean DR less than 1.0 and/or individuals with DR = 0. Further selections from these accessions could be made to develop Cucurbita breeding lines and cultivars with resistance to crown rot caused by P. capsici.
机译：辣椒疫霉菌会导致幼苗死亡，南瓜和南瓜腐烂，造成冠冠和根腐烂，水果腐烂和叶枯病（南瓜属）。在来自全球39个地理位置的总共119种moschata品种和高度易感的南瓜品种Butterbush中，接种了来自佛罗里达州的三种高毒力辣椒疫霉菌悬液，以鉴定其对冠腐病的抵抗力。 Moschata菌种的平均疾病等级（DR）为1.4到5（0到5等级，其中0抗性和5易感）。潜在的耐性和耐性个体被鉴定出在毛孢梭菌中。重新筛选了原始屏幕中的一组18个PI，以防胎冠腐烂。重新筛选产生的结果与原始筛选相似（r = 0.55，P = 0.01）。鉴定出品名PI 176531，PI 458740，PI 442266，PI 442262和PI 634693的冠冠感染率最低，平均DR小于1.0，和/或DR = 0的个体。可以从这些登录物中进一步选择发展对辣椒辣椒引起的冠腐病具有抗性的南瓜子育种系和品种。

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