西南地区立枯丝核菌优势融合群致病性的初步研究

STUDY ON THE PATHOGENICITY OF THE MAIN ANASTOMOSIS GROUPS OF RHIZOCTONIA SOLANI IN SOURHWEST CHINA

用AG-1TA、AG-4及AG-2三个菌丝融合群共8个菌株,对11科19属20仲植物进行了侵染试验。结果表明,AG-1TA、AG-4及 AG-2的侵染范围无明显差异,能使大多数参试植物发生种腐和立枯,但各融合群间的致病力有所不同。AG-4对种子及幼苗的致病力大于 AG-1TA 及 AG-2,而 AG-1TA对水稻及玉米成株的致病大于 AG-4并引起典型的纹枯症状。

Twenty plant species of 19 genera from 11 families were inoculated with Rhizoctonia solani,Which belong to AG-1IA,AG-2 and AG-4,to study the pathogenicity of them. The results showed that there was no great difference in infection range of plant among the groups in causing seed rot and the damping off of seedlings.However,their pathogenicity was not on the same level.The pathogenicity of AG-4 was much stronger than the other two anastomosis groups,but the pathogenicity of AG-1IA was greater than that of AG-4 on corn and rice plant,and AG-1IA caused typical sheath blight of them.