The characteristics of promoting plant growth of salt-tolerant endophytic bacterium Bacillus aryabhattai isolated from man-grove were determined,and the effects of its colonization into mung bean[Vigna radiata(Linn.)Wilczek]under salt stress were stud-ied.The results showed that the highest NaCl tolerant concentration of B.aryabhattai was 110 g/L,the highest pH tolerant value was 10.0,the IAA production capacity was(154.474±1.526)μg/mL,the ACC deaminase activity was(0.125 6±0.051 2)U/mg,and the capacities of dissolving organic phosphorus and inorganic phosphorus were 1.89±0.03 and 2.27±0.01,respectively.Two genes,appA and phoD,were amplified in the genomic DNA,which was the molecular mechanism of the phosphorus-solubilizing ability of the bac-teria.The colonization rates of B.aryabhattai in roots,stems and leaves were 68.27%,63.48%and 50.00%,respectively.The chloro-phyll content and superoxide dismutase(SOD)activity of mung bean seedlings in the colonization group were higher than those in the control group,indicating that the colonization of B.aryabhattai contributed to the improvement of the antioxidant capacity of mung bean seedlings,thus effectively increasing the salt tolerance of mung bean.
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