花生根瘤菌的抗逆性初步研究

PRELIMINARY STUDY ON PEANUT RHIZOBIA OF CHINA FOR TOLERANCE TO STRESSES

对３９株花生根瘤菌（其中６株为引进菌株）和９株参比菌株进行干旱、ＮａＣｌ、ｐＨ及低温的耐受性实验。结果表明我国花生根瘤菌资源中存在着耐盐、酸较强的菌株，且耐受性水平差异较大；在８℃条件下供试菌株未见生长；花生根瘤菌有着比大豆根瘤菌更强的抗干旱能力，抗干旱能力同耐盐能力之间没有明显的关系。另外，菌株的抗逆性同共生特性、分离地之间也未见有明显的关系。

39 strains of Peanut rhizobia [Bradyrhizobium sp. (Arachis)], 33 of which were isolated from nodules of 20 peanut cultivars in 16 types of soil in 11 provinces of China were compared for their growth or survival abilities under the stresses of NaC1, acid, alkali, low temperature, and desiccation with 9 reference strains of known species. The results show that there are some peanut rhizoia isolated from China with superior tolerance to NaC1, acid, and desiccation but their endurance abilities differ greatly, and not any studied strain shows discernable growth under the low temperature of 8℃. Under the water Potential of-1.5kJ kg1 peanut rhizobia seem to survival more quantity than soybean rhizobia, and their abilities of surviving the desiccation have no necessary relation to their salt-tolerance ability. Further more, it also seems that rhizobia strain's stress-tolerant capability has no essential correlation with its symbolic capability and sampling site.