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| Effects of salt-tolerant bacteria on rice seed germination and seedling growth under salt stress |
| Received:May 19, 2021 |
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| KeyWord:salt stress;exogenous microorganisms;rice;seed germination;seedling growth;antioxidant enzyme activity |
| Author Name | Affiliation | E-mail | | LIU Peng | School of Agriculture, Ningxia University, Yinchuan 750021, China | | | BI Jiangtao | School of Ecological Environment, Ningxia University, Yinchuan 750021, China | bi_jt@nxu.edu.cn | | LUO Chengke | School of Agriculture, Ningxia University, Yinchuan 750021, China | | | HUI Zhibing | School of Agriculture, Ningxia University, Yinchuan 750021, China | | | LI Wenbing | School of Agriculture, Ningxia University, Yinchuan 750021, China | | | XIAO Guoju | School of Ecological Environment, Ningxia University, Yinchuan 750021, China | | | WANG Jing | School of Ecological Environment, Ningxia University, Yinchuan 750021, China | |
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| Abstract: |
| Soil salinization seriously affects plant growth and development. To explore the effects of microorganisms on seed germination and seedling growth under salt stress, filter paper germination of Ningjing 28 seeds in a petri dish under 150 mmol·L-1 NaCl stress was conducted to study the effects of different salt-tolerant strain combinations on seed germination and seedling growth according to the physiological metabolism of rice. The results showed that different strain combinations promoted rice seed germination and seedling growth under salt stress. Taking no bacteria under salt stress as the control, the combinations of Bacillus subtilis + Bacillus thuringiensis + Bacillus aryabhattai(ABD) and Bacillus subtilis + Bacillus thuringiensis + Paenibacillus polymyxa + Bacillus aryabhattai(ABCD) could increase the germination rate by approximately 20%. The ABCD combination increased the bud length and root length by 4.75 times and 0.72 times, respectively, seed vigor index by 3.19 times, and salt tolerance index by 3.20 times. The chlorophyll content and root vigor also significantly increased(P<0.05), whereas the relative salt injury rate significantly decreased(P<0.05). The combination of strains reduced the content of malondialdehyde(MDA), increased the activities of peroxidase(POD), catalase(CAT), and superoxide dismutase(SOD) in rice seedlings under salt stress, and alleviated the salt toxicity to rice. There were some differences among the treatments, and the combination of multiple strains could improve the activity of SOD in rice seedlings. Salt-tolerant microorganisms can enhance the salt tolerance and promote the seed germination and seedling growth of rice. Moreover, the effect of multiple strains is better than that of a single strain. |
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