宁夏灵武白芨滩国家级自然保护区苦豆子内生放线菌区系分析

从宁夏灵武白芨滩国家级自然保护区不同土壤类型、不同优势植被的6个样区，采集苦豆子种子及健康植株60份，分离出内生放线菌288株．鉴定表明，同一植株不同组织中，内生放线菌数量以根部最多，其次为种子，叶部最少；淡灰钙土中苦豆子内生放线菌数量比风沙土中多；旱中生杂类草沙生植被草原苦豆子内生放线菌数量最多．各样区苦豆子共分离出11个属的内生放线菌，以链霉菌属和诺卡氏菌属为优势属，其中链霉菌属以白孢类群和灰褐类群为主．

Diversity Analysis of Endophytic Actinomycetes Isolated from Sophora alopecuroides L.of Lingwu Baijitan National Nature Reserve in Ningxia

The 288 endophytic actinomycetes were separated and cultivated from 60 samples ot healthy seeds and plant of Sophora alopecuroicles L. in six sample areas, where were sampled from different vegetations and the soil types in Lingwu Baijitan National Nature Reserve of Ningxia. Endophytic actinomycetes were classified according to their morphological characteristics. The results showed that the quantities of endophytic aetinomycetes from different parts of S. alopecuroides L. were varied and there were more endophytic actinomycetes in the roots than that in the seeds and leafs for the same plant. The quantities of endophytic actinomycetes from S. alopecuroides L. were significantly more in sierozem than that in aeolian and the salinized sandy soil. There were the most endophytic actinomycetes from S. alopecuroides L. in the desert steppe with xerophytic mesophytic sandy weeds than that in the other five desert steppe types. These endophytic actinomycetes from S. alopecuroides L. in the desert steppe of Lingwu Baijitan National Nature Reserve were attributed to 11 genus. Stretomyces and Norcardia were dominant. Albacores and Greyosporus were dominant in Stretomyces.