象耳豆根结线虫对7个品种番茄生长的影响

The effects of Meloidogyne enterolobii on the growth of seven tomato varieties

【目的】探究象耳豆根结线虫Meloidogyne enterolobii对番茄品种的最低接种数量,以及接种量对7个番茄品种致病力及生长的影响.【方法】通过温室大棚盆栽番茄,将孵化的象耳豆根结线虫二龄幼虫悬浮液制成10个不同浓度,通过灌根的方法将悬浮液接种至番茄根部,60 d后,测定番茄植株高度、地上部分鲜质量、根结数量、卵块数量和根内幼虫总数量,比较致病力差异.【结果和结论】象耳豆根结线虫二龄幼虫最低接种量为0.08条·cm-3,与其他不同种类的根结线虫相比,具有更强的致病力.象耳豆根结线虫强致病力对番茄抗性和易感病品种均造成严重伤害.

【Objective】To explore the minimum inoculation quantity of Meloidogyne enterolobii to tomato and to evaluate the inoculation quantity effects on the growth and pathogenicity of 7 tomato varieties.【Method】The tomato plants were potted in the greenhouse. Ten different gradient suspensions of the second instar larvae were set and inoculated to tomatoes by root-drenching method. The height,ground fresh mass of tomato,the number of root-knots,the number of eggs and the number of juveniles within roots were measured to determine the pathogenicity after sixty days inoculation. 【Result and conclusion】The results showed that the minimum inoculation quantity reached or over 0. 08 of the second instar larvae of M. enterolobii in each cm3 soil,which means strong pathogenicity compared to other species of Meloidogune. The strong pathogenicity of M. enterolobii can cause serious damage to both resistant and susceptible tomato cultivars.