将南方根结线虫自然群体在含有Me3抗线虫基因的辣椒HDA149上连续选择15代,获得了一对针对辣椒(Capsicum annuum L.)抗线虫基因Me3的南方根结线虫毒性和无毒近等基因系。通过将Me3毒性线虫接种在抗病辣椒HDA149、感病辣椒茄门以研究适合度代价,结果显示,南方根结线虫Me3毒性群体在感病辣椒上存在适合度代价,适应值仅为76%。将Me3毒性线虫接种在含有其它抗线虫基因(Mi、Me)的番茄和辣椒上研究南方根结线虫Me3毒性的专化性,结果表明Me3毒性线虫不能在含有Mi抗线虫基因的番茄上产生根结和卵块,但是可以在含有其它Me基因的辣椒上产生卵块。说明南方根结线虫Me3毒性对抗性基因Me存在专化性。 The natural population of Meloidogyne incognita was continuously selected for 15 generations on pepper HDA149 containing the anti-nematode gene Me3, and a pair of virulent and non-toxic near-isogenic genes against Meloidogyne incognita (Pep. Capsicum annuum L.) were obtained system. Inoculation of Me3 virulent nematodes on HDA149 and susceptible capsicum to study the fitness cost showed that there was a fitness cost of Meloidogyne incognita Me3 in susceptible pepper with a fitness of only 76%. Inoculation of Me3 virulent nematodes on tomatoes and peppers containing other nematode genes (Mi, Me) to study the specificity of Me3 toxicity in Meloidogyne incognita showed that Me3 virulent nematodes failed to produce roots on tomatoes containing the Mi nematode gene Knot and egg masses, but egg masses can be produced on peppers containing other Me genes. Meal toxicity of the root knot nematode Me3 gene Me exist specificity.