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This study was conducted to investigate the effects of endophyte inoculation on the growth, mineral element and organic acid content of non-endophyte inoculated seedlings (E-) and endophyte inoculated seedlings (E+) of rice (Oryza sativa L.) under 0, 5, 10, 15 and 20% PEG for 7 days. Osmotic stress significantly decreased plant height, shoot dry weight and chlorophyll content of the Eand E+, but root length and dry weight were first increased and then decreased. Endophyte inoculation significantly increased plant height, shoot dry weight and chlorophyll content, but decreased root length and had no effects on root dry weight. Endophyte inoculation significantly increased the K, Ca, Mg, and P contents, but reduced the Ni content of the leaves and roots under osmotic stress, while it increased the Mn content of the leaves and the Na content of the roots. Under osmotic stress the E+ accumulated more fumarate in the leaves in comparison with the E-, as well as more malate, acetate, fumarate and oxalate in the roots. These results suggest that endophyte inoculation improved osmotic stress tolerance of rice seedlings by enhancing mineral uptake and organic acid accumulation. The application of endophytes has a beneficial effect on plant tolerance to osmotic stress.

EFFECT OF ENDOPHYTE INOCULATION ON THE ACCUMULATION OF MINERAL ELEMENTS AND ORGANIC ACIDS IN RICE (ORYZA SATIVA L.) UNDER OSMOTIC STRESS