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通过设置两种孔径(1 mm和5μm)的网袋(25 cm×25 cm),采用于土样中添加猪粪的处理,获得有大量食细菌线虫富集(SM1)的,和有少量食细菌线虫富集(SM5)的供试土壤(两者养分状况相近),以研究食细菌线虫对拟南芥根系生长的影响。结果表明,在种植拟南芥15d后,与有少量线虫富集的PSM5处理相比,有大量线虫富集的PSM1处理拟南芥根系显著增长,根的表面积显著增大,根尖数显著增多。PSM1处理在显著增加土壤中NH4+-N的同时,还使土壤中植物激素(GA3和IAA)的含量显著增高。此外,土壤微生物群落对单一碳源的利用能力(Biolog)的差异,表明存在大量食细菌线虫的土壤,微生物群落结构组成发生了变化。此结果说明,土壤食细菌线虫对根系生长影响的效应,除了养分效应外,还存在激素效应,与食细菌原生动物和植物根系生长之间的相互作用的机制相似。
A large number of bacteria-inhabiting nematode enrichment (SM1) were obtained by setting up two 25 mm × 25 cm (25 cm × 25 cm) Bacterial nematode enrichment (SM5) for the test soil (both nutrient status are similar) to study the effects of bacterial-feeding nematodes on Arabidopsis root growth. The results showed that compared with PSM5 with a few nematode enrichment, the root exudates of PSM1 treated with a large amount of nematode were significantly increased after 15 days of Arabidopsis thaliana growth, the surface area of root increased significantly, and the number of root tips significantly increased . PSM1 treatment significantly increased soil NH4 + -N, but also significantly increased soil plant hormones (GA3 and IAA). In addition, the differences in soil microbial community on the availability of a single carbon source (Biolog) indicate that there is a change in the composition of soil and microbial communities in the presence of large numbers of bacteria-eliciting nematodes. This result shows that the effect of soil-borne bacterial nematodes on root growth has a hormone effect in addition to the nutrient effect, similar to the mechanism of interaction between bacterial-borne bacterial protozoa and plant root growth.