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35个马铃薯品种对镰刀菌干腐病优势病原的抗病性评价

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Keywords: 马铃薯,抗病性,接骨木镰刀菌,茄病镰刀菌,系统聚类分析

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Abstract:

为合理利用抗源,用菌株混合接种法分别接种接骨木镰刀菌Fusariumsambucinum和茄病镰刀菌F.solani,以DPS2000数据处理系统对接种块茎第15天腐烂斑的半径进行系统聚类分析,从而探讨35个马铃薯品种对镰刀菌干腐病优势病原的抗病性。结果表明:以接种接骨木镰刀菌的块茎其腐烂半径原始数值不转换、接种茄病镰刀菌的块茎其腐烂半径原始数值进行标准化转换、聚类方法均采用欧式距离、最长距离法,其聚类效果与接种结果的吻合度最好。接种接骨木镰刀菌后,以欧式距离21作为最佳聚类距离分割点,将试验品种分为11个抗病品种、17个中抗品种和7个感病品种;接种茄病镰刀菌后,以欧式距离3.0作为最佳聚类距离分割点,将试验品种分为13个抗病品种、14个中抗品种和8个感病品种。

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