Effects of Exogenous Salicylic Acid on the Physiological Traits of Kiwifruit Rootstocks under Drought Stress
[Objective]To explore the effects of exogenous salicylic acid on the physiological traits of kiwifruit rootstocks under drought stress and provide a theoretical basis for the application of drought-resistant regulatory substances.[Method]A pot experiment was carried out using'Bruno'kiwifruit as the material,after pretreatment with exogenous salicylic acid,25%polyethylene glycol 6000(PEG-6000)solution was used to simulate drought stress.The changes in the physiological indexes of the leaves of'Bruno'kiwifruit were measured at different times after drought stress.[Result]Under the treatments with 1,2 and 4 mmol/L salicylic acid solutions,the increase ranges of the mass fractions of malo-ndialdehyde(MDA)and hydrogen peroxide(H2O2)in the kiwifruit leaves under drought stress were significantly re-duced,while the increase ranges of the mass fraction of proline(Pro),the activities of superoxide dismutase(SOD)and catalase(CAT)were significantly increased.Among them,the treatment with 2 mmol/L salicylic acid solution had the most obvious drought-resistant effect.[Conclusion]The exogenous salicylic acid treatment reduced the degree of mem-brane lipid peroxidation,enhanced the accumulation of osmoregulatory substances and increased the activities of antioxi-dant enzymes,thus improving the drought resistance of kiwifruit plants.
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