大豆孢囊线虫是国内外大豆产区的一种主要病害,使大豆严重减产。1973年美国报道了大豆孢囊线虫的侵染。1984和1985年国内刘汉起和刘维志等报道了八省市25点鉴定出1,3,4号生理小种。Brim等研究证明对大豆孢囊线虫的抗性,受独立遗传的隐性基因控制。本文试图对3号生理小种抗性基因的分离做初步研究,用以指导抗线虫育种实践。材料和方法用RY91、RY8育成品系,经三年抗孢囊线虫鉴定分别确定为高抗和感线虫品种,吉林20号做亲本材料,各配制两个正反交组合。 1988年做杂交;1989年种植F_1代同时做了回交;1990年对亲本、F_1、F_2、回交群体和Essex(感病ck)种植在线虫高发生试验田内,每百克土孢囊线虫量为143。行长4m,行距 Soybean cyst nematode is one of the major diseases in the soybean producing area at home and abroad, which causes serious soybean yield loss. The United States in 1973 reported the soybean cyst nematode infection. In 1984 and 1985, Liu Han from China and Liu Weizhi and other reports of eight provinces and eight cities identified 1, 3, 4 physiological races. Brim and other studies have shown that resistance to soybean cyst nematode, controlled by recessive genes independently inherited. This paper attempts to preliminary study on the isolation of resistance gene 3 of Physiological races to guide the practice of resistance to nematode breeding. Materials and methods RY91, RY8 bred lines, identified three years after the anti-cyst nematode were identified as high resistance and susceptible nematode varieties, Jilin 20 as the parent material, each prepared two combinations of positive and negative. In 1988, the F_1 generation was planted backcross at the same time. In 1990, the parents, F_1, F_2, backcross population and Essex (susceptible ck) were planted in high test-nematode field, The amount is 143. Governor 4m, line spacing