Journal of Integrative Agriculture ›› 2011, Vol. 10 ›› Issue (7): 1072-1079.DOI: 10.1016/S1671-2927(11)60096-5

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Proteomic Study on Two Bradyrhizobium japonicum Strains with Different Competitivenesses for Nodulation

  

  1. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences
  • 收稿日期:2010-08-14 出版日期:2011-07-21 发布日期:2011-08-14
  • 通讯作者: Correspondence LI Jun, Professor, Tel: +86-10-82106208, Fax: +86-10-82106208, E-mail: jli@caas.ac.cn

Proteomic Study on Two Bradyrhizobium japonicum Strains with Different Competitivenesses for Nodulation

  1. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences
  • Received:2010-08-14 Online:2011-07-21 Published:2011-08-14
  • Contact: Correspondence LI Jun, Professor, Tel: +86-10-82106208, Fax: +86-10-82106208, E-mail: jli@caas.ac.cn

摘要: Competitiveness for nodulation of Bradyrhizobium japonicum strains plays a key role in symbiotic nitrogen fixation. Inorder to reveal the difference in competitiveness, B. japonicum 4534 with high competitiveness and B. japonicum 4222with low competitiveness for nodulation were analyzed by proteomic technique. The results showed that differentialproteins were fewer when two strains were treated with just daidzein. Only 24 and 10 differential proteins were detectedwith an up-regulated rate of 58 and 40% in B. japonicum 4534 and B. japonicum 4222, respectively. However, moredifferential proteins were detected upon treatment with daidzein and mutual extracellular materials simultaneously. Therewere 78 differential proteins detected in B. japonicum 4534 with 43 being up-regulated and 35 being down-regulated.These differential proteins, such as metabolism-related proteins, transporters, transcription-related proteins, translationrelatedproteins, and flagellin, were found to be associated with nodulation process. 25 up-regulated and 22 down-regulatedproteins were detected in B. japonicum 4222. Some of these proteins were not related to nodulation. More differentialproteins associated with nodulation in B. japonicum 4534 may be the reason for its high competitiveness. The results canprovide a guide to the selection and inoculation of effective strains and are significant to biological nitrogen fixation.

关键词:

Abstract: Competitiveness for nodulation of Bradyrhizobium japonicum strains plays a key role in symbiotic nitrogen fixation. Inorder to reveal the difference in competitiveness, B. japonicum 4534 with high competitiveness and B. japonicum 4222with low competitiveness for nodulation were analyzed by proteomic technique. The results showed that differentialproteins were fewer when two strains were treated with just daidzein. Only 24 and 10 differential proteins were detectedwith an up-regulated rate of 58 and 40% in B. japonicum 4534 and B. japonicum 4222, respectively. However, moredifferential proteins were detected upon treatment with daidzein and mutual extracellular materials simultaneously. Therewere 78 differential proteins detected in B. japonicum 4534 with 43 being up-regulated and 35 being down-regulated.These differential proteins, such as metabolism-related proteins, transporters, transcription-related proteins, translationrelatedproteins, and flagellin, were found to be associated with nodulation process. 25 up-regulated and 22 down-regulatedproteins were detected in B. japonicum 4222. Some of these proteins were not related to nodulation. More differentialproteins associated with nodulation in B. japonicum 4534 may be the reason for its high competitiveness. The results canprovide a guide to the selection and inoculation of effective strains and are significant to biological nitrogen fixation.

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