【摘要】 1986—1987年,从我省的信阳、驻马店、新乡、濮阳等12个地市采集到小麦纹枯病病株27份,共分离出27个丝核菌菌株,其中多核丝核菌7株,双核丝核菌20株,经与日本标准丝核菌作对峙测配,结果多核丝核菌属于AG—BI 菌丝融合群的7个,双核丝核菌属于AG—D 菌丝融合群的16个,AG—B₀菌丝融合群的4个。将AG 代表菌株对小麦幼苗进行致病性测定,均可引起小麦叶鞘变褐,有明显纹枯病症状。AG—D 和AG—BI 代表菌株的生物学性状研究表明,菌丝生长适温为23℃,低于5℃。和高于30℃生长均受到抑制;最适pH 值为6;单糖、双糖和多糖作为碳源均可被病原菌利用,以麦芽糖和蔗糖为最好;对氮源的利用以硝态氮为最好;光照以散光和黑暗为最好。更多还原

【Abstract】 During 1986-1987,27 isolates from sheath blight of wheat in 12 areas（Xingyang,Zhumadian,etc.）in Henan province were isolated and two diffe-rent specials,i.e.Rhizoetonie solani（7）and R.cerealis（20）were ident-ified.The results paired with Japanese representative strain indicated that R.solani belongs to AG-BI（7）,and R.eerealis belongs to AG-D（16）and AG-B₀（4）.The results of pathogenicity of the representative strain of AG showedthey cause all typical symptoms.The results of study on bionomics of representative strain of AG-D andAG-BI are as follows.the temperature range of mycelium growth is 5—30℃,the optimum temperature is 23℃ and the optimun pH is 6.For the myeeliumgrowth,maltose and sucrose are better than other carbohydrates,while nitr-ic nitrogen is better than ammoniacal nitrogen,astigmatism and darkness areadvantageous.更多还原