棉花枯萎病菌异核体的三个不同核型分离子DNA碱基组成及18S rDNA序列

GC CONTENT AND 18S rDNA SEQUENCE IN THREE NUCLEAR TYPE SEGREGANTS ISOLATED FROM A HETEROKARYON OFFUSARIUM OXYSPORUM F.SP.VASINFECTUM

从棉花枯萎病菌 (Fusariumoxysporumf.sp .vasinfectum)异核体菌株Ag1 49的菌落角变处分离得到 3个培养特征和致病性差异明显的单孢分离子。分别测定了这 3个分离子的总DNA和核DNA的碱基组成 ,以及它们的 1 8SrDNA的部分序列 ( 1 477个碱基对 )。它们的总DNA (G +C)mol%差异在 0 1 %～ 0 4%之间 ;核DNA (G +C)mol%的差异在0 4%～ 0 8%范围内 ;而 1

Three nuclear type segeragants were isolated from a heterokaryon of Fusarium oxysporum f.sp.vasinfectum strain Ag149.Their cultural character and pathogenicity were different.The differences of their GC content for total DNA and nuclear DNA were between 0 1% to 0 4% and 0 4% to 0 8% respectively,as measured by thermal denaturation method.The 18S rDNA partial sequences of 1477 base pairs in these segregants were identical.