番茄抗性砧木对土壤根结线虫二龄幼虫和自由生活线虫的影响

Effect of tomato resistant rootstock on soil root-knot nematode second-stage juveniles (J_2) and free-living nematode

研究了引自意大利的3种番茄抗性砧木对温室土壤根结线虫二龄幼虫的控制作用以及对土壤自由生活线虫的影响。供试温室土壤共鉴定12科26属自由生活线虫,分属食细菌性线虫、食真菌性线虫、植食性线虫和杂食性线虫4种营养种群。试验结果表明,3种抗性砧木均显著地降低了嫁接苗植株根际土壤中根结线虫二龄幼虫(J2)的密度,从而控制了根结线虫病的发生;与不种植番茄的空白对照相比,种植番茄促进了根际自由生活线虫的繁殖,但抗性砧木根际自由生活线虫的密度小于感病对照"FA189"。所有处理根际自由生活线虫优势种群为食细菌性线虫。

The effect of three tomato resistant rootstocks introduced from Italy on root-knot nematode second-stage juveniles （J2） and free-living nematode in greenhouse soil was studied. 12 families and 26 genes of free living nematodes were found in investigated greenhouse soils, belonging to four trophic groups： bacterivore, fungivore, herbivore and omnivore nematodes. The investigation results indicate that the three resistant rootstocks extremely reduce root-knot nematode second-stage juvenile （J2） density, thereby effectively controlling root-knot nematode disease. It is also observed that tomato cultivation increases the density of free- living nematodes as against tomato-free soils. There are fewer free-living nematodes in soils with three resistant rootstocks than in soils with susceptible （control） variety, ＂FA189＂. In all treatments, bacterivorous nematode is the dominant group of free living nematodes.