重迎茬条件下大豆根系分泌物对根腐病病原菌的影响

THE EFFECT OF SOYBEAN ROOT SYSTEM SECRETION UPON THE PATHOGENIC FUNGI PRODUCING BY ROOT ROT UNDER CONTINUES-CROPPING AND ONE YEAR INTERMITTENT CROPPING

采用重迎茬条件培养大豆，分离大豆根系分泌物，以大豆根系分泌物为培养基，培养大豆根腐病病原菌，观察重迎茬条件下的大豆根系分泌物对大豆根腐病病原菌的影响。同时利用液体培养的方法，培养大豆根腐病病原菌，用培养液处理土壤，测定病原菌分泌物对土壤微量元素的活化作用。结果表明，重迎茬条件下大豆根系分泌物对立枯丝核菌影响最大，而病原菌分泌物对土壤元素的活化顺序为Ｍｎ〉Ｚｎ〉Ｃｕ〉Ｃｄ。

Separated soybean root system secretion under continues-cropping and one year intermittent cropping, made culture medium by using the secretion, and observed the effect of soybean root system secretion upon the root rot pathogenic fungi. In the meantime, the root rot fungi were cultured by using the method of liquid culture. Soil was treated with culture filtrate and we determined the activity of the fungi secretion on trace elements in soil. The results of studiesshowed: the effect of soybean root system secretion upon Rhizoctonia was the most important, and the order of activity of the fungi secretion on trace elements in soil was:Mn〉Zn〉Cu〉Cd.