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

• Published in: Journal of Integrative Agriculture Vol. 10; no. 7; pp. 1072 - 1079
• Main Author: LI Jun, XIAO Wen-li, MA Ming-chao, GUAN Da-wei, JIANG Xin, CAO Feng-ming, SHEN Delong, CHEN Hui-jun , LI Li (College of Agronomy, Agricultural University of Hebei/Hebei Sub-Center of Chinese National Maize Improvement Center/Northern China Key Laboratory for Crop Germplasm Resources, Ministry of Education)
• Format: Journal Article
• Language: English
• Published: Science Press 21.07.2011
• Subjects: Bradyrhizobium japonicum strains daidzein extracellular materials competitiveness for nodulation proteomic technique
• ISSN: 2095-3119; 2352-3425

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.