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Isolation and application of effective nitrogen fixation rhizobial strains on low-phosphorus acid soils in South China

  • Articles/Plant Nutrition
  • Published:
Chinese Science Bulletin

Abstract

Soybean (Glycine max L.) is a very important food and oil crop in China. Legume-rhizobium symbiotic nitrogen (N) fixation is an important biological character and also the base of improving soil fertility of soybean. However, soybean production and development is severely limited in tropical and subtropical areas in China due to a lack of effective rhizobial inoculants adapting to low-phosphorus (P) acid soils. In the present study, 12 soybean rhizobial strains were isolated and purified from the nodules of two soybean genotypes contrasting in P efficiency, which were grown on different low-P acid soils with different soybean cultivation histories. Results from 16S rDNA sequence analysis showed that these 12 rhizobial strains belonged to the genus of Bradyrhizobium, which had higher nitrogenase activities compared to the control strain, Bradyrhizboium japonicum USDA110. A field experiment was carried out by applying rhizobial inoculants, a mixture of three rhizobial strains that showed the highest nitrogenase activity, on a typical low-P acid soil in South China. The results showed that, without inoculation, no nodules were formed in the three soybean genotypes tested; with inoculation, the nodulation rates in all were 100%. Inoculation with rhizobial inoculants not only made many nodules formed, but also increased soybean shoot biomass and yield, and improved nitrogen (N) and P nutrient status. Among which, shoot dry weight, N and P content of a soybean genotype, Huachun 3, inoculated with rhizobium were increased 154.3%, 152.4% and 163.2% compared to that without inoculation, respectively. We concluded that: (i) The effective indigenous rhizobial strains isolated in this study from soybeans on low-P acid soils in South China have the characters of broad host range, high nodulation efficiency, efficient N fixation, great low pH and low P tolerance. (ii) Soil environment and host types are the key factors to screen the effective rhizobial strains. Considering soil pH values and P efficiency of the host genotypes might increase the screening efficiency. (iii) Improving N status and facilitating root growth might be the mechanisms of increasing the P uptake in soybean plants inoculated with the effective rhizobial strains on low-P acid soils. (iv) Inoculation with the effective rhizobial inoculants could significantly improve growth, N and P content of soybean on low-P acid soils, which might be an effective approach to enhance soybean cultivation and development in these areas. Therefore, application and extension of inoculation techniques with effective rhizobial inoculants in legumes would result in great economical, environmental and ecological benefits.

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Authors and Affiliations

  1. Root Biology Center, South China Agricultural University, Guangzhou, 510642, China

    FengXian Cheng, GuiQin Cao, XiuRong Wang, Jing Zhao, XiaoLong Yan & Hong Liao

Authors
  1. FengXian Cheng
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  2. GuiQin Cao
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  3. XiuRong Wang
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  4. Jing Zhao
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  5. XiaoLong Yan
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  6. Hong Liao
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Corresponding author

Correspondence to Hong Liao.

Additional information

The authors contributed equally to this work

Supported by National Key Basic Research and Development of China (Grant No. 2005CB120902), McKnight Foundation Collaborative Crop Research Program (USA) (Grant No. 05-780) and National Natural Science Foundation of China (Grant No. 30571111)

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Cheng, F., Cao, G., Wang, X. et al. Isolation and application of effective nitrogen fixation rhizobial strains on low-phosphorus acid soils in South China. Chin. Sci. Bull. 54, 412–420 (2009). https://doi.org/10.1007/s11434-008-0521-0

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  • DOI: https://doi.org/10.1007/s11434-008-0521-0

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