摘要
从宁夏8个市县采集旱育秧立枯病病样550份,分离后获275株菌,分属8属真菌:①镰孢属(Fusari-um),占53.1%;②腐霉属(Pythium),占22.5%;③丝核属(Rhizoctom),占1.5%;④蠕孢属(Bipolaris),占2.5%;镰格孢菌(Alternaria)28株,占10.2%;青霉菌(Penicillium)13株,占4.7%;根霉菌(Rhizopus)9株,占3.3%;木霉菌5株,占1.8%。经对镰孢菌、腐霉菌、丝核菌致病性测定表明,不同病菌的致病力和引起的症状类型有一定差异。3个属的病菌均能引致稻苗的黄枯、青枯,并且伴随茎基部褐色病斑;引起矮化的是镰刀菌和腐霉菌;引起徒长的主要是镰刀菌。镰刀菌发病率75.4%,腐霉菌发病率41.5%,丝核菌发病率12.9%。
275 strains of fungi were obtained by the isolation of 550 samples of rice seedling showing blight on dry seedbed from 8 places of Ningxia. These strains belonged to 8 fungal genera:(1)Fusariurn ,made up 53.1% . (2) Pythiurn ,made up 22.5%. (3) Rhizoctorn , made up 1.5%. (4) Bipolaris , made up 2.5%. The inoculation test showed that there were significant difference in the pathogenicity of various species and the symptoms caused by them. 3 fungal genera could induce rice seedlingyellowing and blight with brown lesions on the stem base. Fusariurn spp. and Pythium spp. caused seedling stunt. In general , Fusariurn spp. caused seedling etionlation. The rate of the diseased rice seedlings was 75.4% by the inoculation of Fusariurn , 41.5% by Pythium, 12.9% due to Rhizoctorn .
出处
《西北农业学报》
CAS
CSCD
北大核心
2009年第1期184-187,共4页
Acta Agriculturae Boreali-occidentalis Sinica
基金
日本国际协力集团(JICA)中国可持续农业技术研究项目
关键词
旱育秧
立枯病
病原菌
Rice seedling in dry seedbed
Rice blight pathogenic fungi
Pathogen