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Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (9): 107-117.DOI: 10.11686/cyxb2021369

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Effects of Suaeda glauca rhizobacteria and endophytic bacterial strains on alfalfa growth under salt-alkaline stress

Yang-yang MIAO(), Yan-rui ZHANG, Biao SONG, Xu-tong LIU, An-qi ZHANG, Jin-ze LV, Hao ZHANG, Xiao-hua ZHANG, Jia-hui OUYANG, Wang LI, Shan-min QU()   

  1. Department of Grassland Science,College of Animal Science and Veterinary Medicine,Heilongjiang Bayi Agricultural University,Key Laboratory of Efficient Utilization and Nutrition Regulation of Feed Resources in Cold Regions of Heilongjiang Province,Daqing 163319,China
  • Received:2021-10-09 Revised:2022-01-11 Online:2022-09-20 Published:2022-08-12
  • Contact: Shan-min QU

Abstract:

This research investigated the effects of rhizobacteria and endophytic bacteria strains on alfalfa seedling growth under salt-alkaline stress in alfalfa (Medicago sativa) cultivarLongmu No.801. Rhizobacteria and endophytic bacteria from plants with strong tolerance to salt-alkaline stress were isolated from Suaeda glauca roots (JG1), rhizosphere soil (JT4) and stems (JJ5) and were inoculated around the roots of alfalfa seedlings. One week after inoculation, neutral salts (NaCl, Na2SO4) and alkaline salts (NaHCO3, Na2CO3) were mixed in the proportions NaCl∶Na2SO4∶NaHCO3∶Na2CO3 = 9∶1∶1∶9, and the roots of alfalfa seedlings were irrigated with 0, 100, 150, 200 mmol·L-1 of these salt-alkaline solutions. The effects on the growth and physiological indexes of alfalfa of these inoculations under the four salt concentrations were analyzed by membership function and principal component analysis. It was found that the three growth-promoting bacteria alleviated the inhibitory effects of salt-alkaline stress on alfalfa and promoted alfalfa growth. The growth-promoting effect of the isolated bacterial strains on alfalfa seedlings under salt-alkaline stress was JT4>JG1>JJ5.

Key words: Suaeda glauca, rhizobacteria, endophytic bacteria, salt-alkaline stress, alfalfa