苹果酸对毛桃镉胁迫的缓解作用OA

In order to explore the effect of malic acid on the growth of peach seedlings under cadmium stress,using peach seedlings as the test material,a pot experiment was conducted with 3 treatments including control group(CK),cadmium stress treatment(T1)and cadmium+malic acid treatment(T2).The effects of malic acid on the growth and cadmium accumulation of peach seedlings under cadmium stress were investigated.The results showed that T1 treatment significantly reduced the plant height,stem diameter,photosynthetic pigment content,total phosphorus and potassium content in the aboveground parts and aboveground biomass of peach seedlings,significantly increased the root-shoot ratio,but had no significant effect on root biomass or total phosphorus and potassium content in roots.T2 treatment could alleviate the effect of cadmium on the growth of peach seedlings.Compared with T1 treatment,the aboveground and underground biomass of peach seedlings increased by 8.15%and 1.81%,respectively,and the contents of chlorophyll a,chlorophyll b and carotenoids increased by 11.21%,6.93%and 7.60%,respectively.Compared with CK,the cadmium content in roots and aboveground parts of peach seedlings of T2 treatment increased by 22.40%and 47.50%.The above indicated that malic acid could promote the growth of peach seedlings under cadmium stress,but it could not be used to alleviate the effect of stress in cadmium-polluted areas.