摘要
研究了正茬及重茬大豆根际土壤中微生物区系的变化。结果表明：细菌总数在整个大豆生育期内占绝对优势，重茬低于正茬。放线菌数量总体变幅不大，真菌数量变化很大，重茬高于正茬。连作大豆根际土壤中有益真菌减少，有害真菌增加。真菌优势菌群中的尖镰孢菌、半裸镰孢菌和粉红粘帚菌回接大豆，均产生不同程度的致病性，导致大豆根腐病的发生，花期前后（３８～５０ｄ）病症明显。半裸镰孢菌和粉红粘帚菌对大豆的致病性及导致根腐病的发生尚未见资料报道。
The variation of microflora was studied in rhizosphere soil of soybean following soybean and soybean following other crops.Results showed that the number of bacteria was dominant over other kinds of microorganisms at all growing stages and in soil of soybean following soybean was less than that of soybean following other crops.The number of actinomycete changed inevidently. The number of fungi varied largely and in soybean following soybean was observed to be much more than that of soybean following other croups.In rhizosphere soil of soybean following soybean,beneficial fungi decreased and pernicious fungi increased.The superior species of fungi, Fusarium oxysporum Schlecht, F.semitectum Berk.et Rav.and Gliocladium roseum (Link)Bain,inoculated into soybean could produce different degree pathogenicity and led to soybean root rot,especially in flowering stage(38～50 days).It has not been reported that F.semitectum Berk.et Rav.and G.roseum (Link) Bain.may result in pathogenicity and soybean root rot.The toxicity experimental result on soybean by the unrefined extract of three fungi toxin manifest that:the germination percentage of soybean decreased obviously, and the growth of soybean was hindered.
出处
《吉林农业大学学报》
CAS
CSCD
北大核心
1999年第1期29-32,共4页
Journal of Jilin Agricultural University
基金
解放军总后军需部资助项目
关键词
大豆
连作
根腐病
真菌
土壤
soybean
continuous cropping
root rot
fungi
soil
