栽培作物的野生种或它的近缘种常常用作抗病性的基因资源,当在作物中没有找到合宜基因的时候,更是如此。栽培稻中由Sclero-tium oryzae引起的真菌病害秆腐病同样存在这种情况。美国加利福尼亚州每年因秆腐病而引起水稻严重减产。虽然在寻找秆腐病抗性的研究中,曾广泛抽样调查采自世界各地的栽培稻品种,但未有发现比加利福尼亚的特早熟品种“Colusa”具有更高抗性水平的品种。但是,“Colusa”本身仅具中等的抗性水平,为 Wild species of cultivated crops or its relatives are often used as genetic resources for disease resistance, especially when no suitable gene is found in the crop. The same is true of fungal diseases caused by Sclero-tium oryzae in cultivated rice. California every year due to stalk rot caused serious decline in rice. Although studies on stalk rot resistance have been extensively sampled to investigate cultivated rice varieties from all over the world, no species more resistant than Colusa in California has been found. However, “Colusa” itself has only a moderate level of resistance