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结球甘蓝霜霉病抗性鉴定与遗传分析

DOI: 10.3969/j.issn.1000-7091.2013.03.035, PP. 193-198

Keywords: 结球甘蓝,霜霉病,抗性鉴定,遗传分析

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Abstract:

在经过高代自交选育出结球甘蓝高抗霜霉病自交系R103和感霜霉病自交系S101的基础上,根据苗床田间自然发病的S101病害症状,以及病原物镜检和回接鉴定,明确该病害的病原是十字花科霜霉菌。经过苗期田间自然诱发和十字期人工室内接种抗性鉴定,以感病亲本为回交亲本的BC1群体中抗病株和感病株的比例,田间是0.91∶1,室内为0.96∶1,经卡平方适合性检测均符合1∶1分离比例;F2分离群体中自然鉴定和人工鉴定抗病单株和感病单株的比例分别为2.93∶1和3.01∶1,检测结果经卡平方分析证明均符合3∶1的分离比例,2种抗性鉴定方法都表明这些群体中结球甘蓝霜霉病抗性受单基因显性控制,为了缩短抗性鉴定时间,可采用人工接种鉴定代表整个苗期结球甘蓝霜霉病抗性。

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