马铃薯块茎中一些矿质元素的含量及其在软腐病发生中的作用

 测定了对细菌性软腐病抗感能力不同的3个马铃薯品种的块茎中14种矿质元素的含量。发现薯肉组织中Cu、Zn的含量高低与品种对伤口侵染的抗性强弱有相关性。Ni、K也有类似情况,而Ca、Mg含量与抗性无关。用溶液渗透法浸泡薯块后,只有CuS0₄能显著抑制软腐病的发生。Zn、Fe、Al等在一定浓度时也有一些作用。Mg处理无效,Ca处理只能使薯块腐烂面积略有减小,而不能减少腐烂病斑数。对于自然带菌和人工接种的薯块。CuSO₄·5H₂O的浓度分别为500和5000mg/L时防效达100%。

MINERAL CONTENT IN POTATO TUBERS AND THEIR EFFECT ON BACTERIAL SOFT ROT

Fourteen elements were analysed in tubers of 3 varieties which have signi-ficant difference in resistance to bacterial soft rot.The content of Cu and Zn, and less obviousely, those of K and Ni in medullar tissues were correlated with resistance to wound infection, while Ca and Mg levels were similar among the 3 varieties.In dipping tests, only CuSO₄·5H₂O could sharply inhibit the disease, with a complete control at 500 mg/L, Zn, Fe, A1 showed weak effect, and Mg treatment was not effective.After dipping in Ca solution, soft rot surface of tubers was slightly reduced, but the number of diseased tubers was not, in comparing with control.