Mitigating effect of exogenous L-carnosine on the growth of'Shidao 960'rice seedlings under drought stress
Drought stress is one of the important abiotic factors restricting crop growth.In order to explore the effect of exogenous L-carnosine on the growth of rice(Oryza sativa)seedlings under drought stress,'Shidao 960'was used as the material.Drought-stressed seedlings were treated with different concentra-tions of L-carnosine to study the changes of seedling on phenotype,physiology and molecular levels.Gray correlation and correlation analysis were used to reveal the relationship between different concentrations of L-carnosine and the phenotype and physiology of drought-stressed seedlings.The results show that ex-ogenous L-carnosine could enhance the activities of peroxidase(POD),superoxide dismutase(SOD),cata-lase(CAT)and ascorbate peroxidase(APX)in seedlings.The contents of osmoregulatory substances,es-pecially proline(Pro),were increased,while the contents of malondialdehyde(MDA),hydrogen peroxide(H2O2)and superoxide anion(O2-·)and relative electrical conductivity(REC)were obviously decreased com-pared with individual drought treatment.At the same time,the expression of rice drought-stress-re-sponse-related genes(OsP5CS,WDL1,OsMPK1,OsDREB1A,OsLEA3-1,and OsSCL30)was induced,thereby alleviating the drought damage to seedlings.Too low concentration of exogenous L-carnosine had no obvi-ous effect,but too high concentration aggravated seedling injury,and the optimum concentration is 1 mmol·L-1.
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