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基于根肿菌早期侵染量的白菜抗性分析

, PP. 510-516

Keywords: 根肿菌,白菜品种,抗病性,根内侵染,实时荧光定量PCR

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Abstract:

为探究不同抗性白菜品种对根肿菌侵染量的影响,通过水培法观测4个白菜品种接种根肿菌后其在寄主根内的发展动态,实时荧光定量PCR检测技术对同期根内含菌量进行分析,并结合温室盆栽试验获得的各品种发病数据进行相关性分析。结果表明,早熟长江5号根肿病的发病率和病情指数分别为82.5%和36.2,华良早五号为66.7%和37.5,CR-春美为68.9%和36.0,可归为感病品种,而CR-英雄为52.5%和16.5,可归为抗病品种;水培法接种观测和PCR定量结果显示,根毛侵染率、皮层侵染数以及根内含菌量均表现为CR-英雄最低,显著低于其它3个品种。根毛侵染率、皮层侵染数、根内含菌量、发病率四者间呈显著相关,其R2最大值变幅为0.84~0.98,且根毛侵染率与根内含菌量、发病率与根内含菌量的最大相关系数均出现在第6天,说明根肿菌早期侵染量直接影响白菜根肿病的发生程度。表明根内早期侵染是根肿菌致病的关键环节,通过水培法观测并结合实时荧光定量PCR检测可以评价品种的抗性,可作为根肿病抗性评价的一种方法。

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