Keywords

Rhizobium, Soybean, Nodulation Compatibility, Nitrogenase Activity

Abstract

The symbiotic system between soybeans and soybean rhizobia is a representative example of symbiotic nitrogen fixation. Research on the matching combination of rhizobia and soybean varieties has important practical value in order to maximize the nitrogen fixation efficiency of this symbiotic system and guide the selection of soybean breeding materials. . Eighteen representative strains of soybean rhizobia from different types and sources were selected to conduct symbiosis matching tests with 11 major soybean core germplasm varieties in my country, and the nitrogenase activity of the nodules of 5 soybean varieties and 14 rhizobia was measured. and perform statistical analysis. The results show that there are obvious differences in nodulation and nitrogen fixation between different soybean rhizobia strains, and the fast-growing soybean rhizobia shows stricter soybean variety matching than the brady-growing soybean rhizobia; among them, USDA110, USDA110-A, 113-2, and WHG12 , HH103, and B16 showed broader-spectrum nodulation characteristics than other tested strains, and the nodules formed by USDA110, USDA110-A, 113-2, WHG12, DE333, and 2048 strains had higher nitrogenase activity. Among the soybean varieties tested, Shang 951099, Zheng 92116 and Beijing black beans showed higher nodulation and nitrogen fixation characteristics; the pair of Shang 951099 and Zheng 92116 all nodulated and had no differences with the 18 soybean rhizobia strains tested. Obviously, the two pairs of materials Suinong 14 and Suinong 20, Hefeng 25 and Guxin wild soybeans showed obvious nodulation differences. Therefore, in practice, based on the matching relationship between soybean varieties and soybean rhizobia strains, strains with good symbiotic effects should be selected for inoculation, or matching soybean germplasm materials should be selected for breeding, in order to improve the symbiotic nitrogen-fixing effect.

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Original research done by Ma Zhongyu, Li Jun, Zhang Yongfang, Fan Hui, Li Li

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