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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—B_(0)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。
From 1986 to 1987, 27 strains of wheat sheath blight were collected from 12 prefectures and cities of Xinyang, Zhumadian, Xinxiang and Puyang in our province, and 27 strains of Rhizoctonia were isolated, of which 7 strains were Rhizoctonia, Twenty strains of Rhizoctonia solani were confronted with the standard Rhizoctonia japonica. As a result, R. multoculatu belonged to 7 AG-BI mycelial fusion groups, and R. rhizogenes belonged to AG-D mycelial fusion group 16 A, AG-B_ (0) mycelium fusion group of four. AG pathogenic strains of wheat seedlings for pathogenicity tests, can cause wheat brown leaf sheath, there are obvious symptoms of sheath blight. Biological characteristics of AG-D and AG-BI representatives strains showed that mycelial growth temperature is 23 ℃, below 5 ℃. And the growth above 30 ℃ were inhibited. The optimal pH value was 6. The monosaccharides, disaccharides and polysaccharides were all utilized as pathogenic bacteria by the pathogenic bacteria, and maltose and sucrose were the best. The utilization of nitrate nitrogen For the best; light to astigmatism and darkness is best.