Physiological Mechanism of Codonopsis pilosula at Vine Growth Stage in Response to Drought Stress
In order to explore the physiological mechanism of Codonopsis pilosula responding to drought stress,this study used an outdoor potted water control experiment to determine the relative water content of soil and leaves,chlorophyll,products of membrane lipid peroxidation,and osmotic adjustment substances under different drought levels in Codonopsis pilosula and changes in physiological and biochemical indicators such as antioxidant enzymes.The results showed that as the drought intensified,the relative water content of the leaves of Codonopsis pilosula gradually decreased;the chlorophyll content gradually increased;the relative electrical conductivity of the leaves,superoxide anion and malondialdehyde and other membrane lipid peroxidation indexes gradually in-creased;the content of amino acids and soluble sugars increased first and then decreased,while soluble proteins in-creased;the activities of antioxidant enzymes(SOD,POD,CAT and APX)all increased first and then decreased,and CAT is more sensitive to drought stress.This indicated that vine growth stage Codonopsis pilosula mainly reg-ulated cell osmotic potential under drought stress by soluble protein,and reduced the damage of membrane lipid peroxidation to cells under drought stress by CAT.
NETL
NSTL
万方数据
