淡紫拟青霉在大豆根际的定殖及对根际微生物的影响

COLOMZATION OF PAECILOMYCES LILACINUS ON SOYBEAN ROOT AND ITS EFFECT ON RHIZOSPIIERE MICRO-ORGANISMS

温室实验证明淡紫拟青霉M－14菌株发酵液对大豆种子包衣，无菌土中种植1周后有1／10的生防菌能够在大豆根际定殖，其中内根际（根表与根内）可检测到菌剂包衣量的1／1000．第2周时内根际菌量提高10倍以上，4周后有所下降。2％NaClO表面消毒后，检测出植物根内也有少量淡紫拟青霉存在。大豆胞囊线虫感病土中，该菌3周后开始大量增殖。病土中引入菌剂，1周后根际其它各种微生物数量略有减少，真菌、细菌、放线菌分别减少16％、27％和27％，4周时均达到平衡，与对照一致。

The results showed that Paecilomyces lilacinus could colonize in soybean rhizosphere,when it was used as a seed-coat. The number of propagules observed in endorhizosphere in sterilized soils was 1/1000 of the coated fungi at the 1 st week. It increased over 10-fold in the 2nd week, and began to decrease after 4 weeks planting. The fungus could also endoparasihze a few in soybean root. In the soils which were sensihve to soybean cyst nematode, The strain multiplied greatly in the 3rd week. The various micro-organisms in soybean rhizosphere were influenced by P. lilacinus when it was intreduced in natural soils.The numbers of fungi, bacteria and actinomyces reduced by 16%, 27% and 27% respectively in the 1 st week. But after a longer Period (4 weeks), all the microbes were as same as the control group.