| Effects of different rhizobia strains on the growth and physiological characteristic of Medicago sativa L. Gannong No. 9 under salt stress |
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| DOI：10.7606/j.issn.1000-7601.2018.03.26 |
| Key Words: rhizobium alfalfa matching salt resistance |
| Author Name | Affiliation | | QI Juan | College of Grassland Science, Gansu Agricultural University/Key Laboratory of Grassland Ecosystem (Gansu Agricultural University)， Ministry of Education/Gansu Grassland Engineering Laboratory/China-US Center for Grazing Land Ecosystem Sustainability, Lanzhou, Gansu 730070, China | | WANG Ting | College of Grassland Science, Gansu Agricultural University/Key Laboratory of Grassland Ecosystem (Gansu Agricultural University)， Ministry of Education/Gansu Grassland Engineering Laboratory/China-US Center for Grazing Land Ecosystem Sustainability, Lanzhou, Gansu 730070, China | | BAI Xiao-Ming | College of Grassland Science, Gansu Agricultural University/Key Laboratory of Grassland Ecosystem (Gansu Agricultural University)， Ministry of Education/Gansu Grassland Engineering Laboratory/China-US Center for Grazing Land Ecosystem Sustainability, Lanzhou, Gansu 730070, China | | JIAO Ting | College of Grassland Science, Gansu Agricultural University/Key Laboratory of Grassland Ecosystem (Gansu Agricultural University)， Ministry of Education/Gansu Grassland Engineering Laboratory/China-US Center for Grazing Land Ecosystem Sustainability, Lanzhou, Gansu 730070, China | | MA Guo-Zhen | College of Grassland Science, Gansu Agricultural University/Key Laboratory of Grassland Ecosystem (Gansu Agricultural University)， Ministry of Education/Gansu Grassland Engineering Laboratory/China-US Center for Grazing Land Ecosystem Sustainability, Lanzhou, Gansu 730070, China | | YANG Ying-Dong | College of Grassland Science, Gansu Agricultural University/Key Laboratory of Grassland Ecosystem (Gansu Agricultural University)， Ministry of Education/Gansu Grassland Engineering Laboratory/China-US Center for Grazing Land Ecosystem Sustainability, Lanzhou, Gansu 730070, China | | HE Ling-Feng | College of Grassland Science, Gansu Agricultural University/Key Laboratory of Grassland Ecosystem (Gansu Agricultural University)， Ministry of Education/Gansu Grassland Engineering Laboratory/China-US Center for Grazing Land Ecosystem Sustainability, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Using the selected strains which matched well with the Medicago sativa Gannong 9 as the research subjects, the effects of the selected strains on plant growth and physiological response were studied under different NaCl treatments (0、0.4%、0.8%、1.2%). The results showed that the alfalfa growth was inhibited significantly by the increasing NaCl concentration. Different rhizobia strains were able to increase the salt resistance of alfalfa by nitrogen fixation, rhizobia symbiosis, maintaining the plant growth and physiological response characteristics. However, different strains-alfalfa match had different tolerance to salt stress. According to the comprehensive analysis of membership function, the strains of Da99, DL58 and QL31B matched better with Medicago sativa Gannong No. 9 with no salt treatment, while there were no significant difference between strains of Ga66, Wa32 and CK. All strains could significantly improve the growth and salt tolerance of alfalfa under different salt stress treatments. Medicago sativa Gannong No.9 matched better with strains of Ga66 and QL31B under 0.4 % NaCl, and the value of membership function increased about 53.8% and 58.6% than CK, respectively. All the strains tested could promote growth and improve salt-resistance better under 0.8% NaCl, and strains of Ga66 and QL31B could promote growth and improve salt-resistance better under 1.2% salt concentration. Comprehensively evaluation indicated that strain QL31B had better match with Medicago sativa Gannong No. 9 on growth and salt tolerance under 0~1.2% salt concentrations. |
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