香根草根际AM菌的感染特性

Study on AM fungi in rhizosphere of Vetiveria zizanioides

通过对不同种植时间、不同种植基质的香根草Vetiveria zizanioides分株苗、组培苗根际丛枝菌根(AM菌)感染检测,探讨了香根草对AM菌的感染特性。结果表明,在消过毒的森林泥炭土中,组培苗种植12个月感染率只有20.0%,感染强度低;种植22个月只有53.3%,感染强度为中。分株苗种植在自然土壤中,3个月就有AM菌感染,其感染率为56.7%;种植22个月感染率达到最高峰,为80.0%,感染强度为中等;种植时间为33个月时,感染率不再增加,但感染强度进一步增高。说明香根草根际AM菌的感染率和感染强度可能与苗源无关,而与种植基质密切相关。

We examined the characteristics of Arbuscular mycorrhizal fungi （AMF） in the rhizosphere of Vetiveria zizanioides in different planting durations and growing medium treatments. Using sterilized forest peat as the growing medium, the infection rate of the tissue-cultured seedlings was only 20.0% and the infection strength belonged to the low grade one month after planting; the infection rate was 53.3 %, and the infection strength was the middle grade 22 months after planting. Using natural farm soil as the growing medium, the infection rate of offset seedlings was 56.7% after planting for 3 months; its infection rate was up to 80.0% and infection strength was up to the middle grade 22 months after planting; the infection rate did not increase any more, but its infection strength further increased 33 months after planting. In summary, AMF infection rate in rhizosphere of V. zizanioides seemed not to have close relationship with seedling source, but it did have with growing medium.