宁夏马铃薯主栽品种对黑痣病的抗性鉴定

Identification of potato resistance to black scurf caused by Rhizoctonia solani in Ningxia

为明确宁夏马铃薯主栽品种对黑痣病的抗性水平,利用田间和室内接种相结合的方法对供试马铃薯品种的抗病性进行评价。室内接种试验表明,供试的20份马铃薯材料中没有免疫及高抗品种,接种量与抗性水平呈负相关,其中‘陇薯7号’,‘黑美人’,‘青薯9号’在接种量为5~15g水平上表现为中抗。通过聚类分析,接种量为5g和10g时,以欧式距离13作为最佳聚类分割点,供试品种可分为3个类群。田间接种综合评价分析表明,不同品种间抗性存在显著差异,通过聚类分析,以欧式距离13作为最佳聚类分割点,试验品种可分为4个高感品种、11个中感品种和5个中抗品种。

In order to evaluate the resistance of different potato cultivars to black scurf caused by Rhizoctonia solani,inoculation in field and laboratory were conducted in Ningxia.Laboratory inoculation identification indicated that none was immune in 20 tested potatoes.The inoculum sizes were negatively related to resistance levels.‘Longshu 7＇,‘Black Beauty＇and‘Qingshu 9＇showed moderate resistance at 5-15 g level of inoculum size.The20 tested potato varieties were grouped into three groups at grouping point 13 of euclidean distance with the inoculum size of 5-10 g in clustering analysis.Field inoculation and comprehensive evaluation analysis indicated that disease resistance was different significantly by clustering analysis,and the 20 tested potato varieties were grouped into 4 highly susceptible cultivars,11 moderate susceptible cultivars and 5 moderate resistant cultivars at grouping point 13 of euclidean distance.