Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Plant Protection submitted time 2018-07-18 Cooperative journals: 《广西植物》
Abstract： Seeds of Angelica sinensis were planted in a matrix containing different proportions of attapulgite clay (the volume ratio ofattapulgiteclay and matrix was 0/1, 1/100, 1/70,1/50,1/20)to study thephysiological effects ofCu stress onA. sinensis seedlings and the protective effect of attapulgite clay on A. sinensis seedlings under CuCl2 stress. The result showed (1): With the increase of exogenous CuCl2 concentration, the Y(II) (PSII operation efficiency), ETR (Rate non-cyclic electron transport through PSII ), qP (Photochemical quenching), and chlorophyll content of leaves of A. sinensis seedlings decreased, while the qN (Non-photochemical quenching), soluble protein content, activities of antioxidant enzymes (SOD, POD, CAT, and APX), the content of H2O2 and the CuCl2 content in the leaves and roots increased significantly. The results showed that the Cu stress decreased in both photochemical efficiency and chlorophyll synthesis of A. sinensis seedlings, and increased the content of Cu and oxidation pressure in tissues. (2): Under Cu stress, the presence of attapulgite clay in the growth matrix can alleviate the copper-stress-induced decreases in the Y(II), qP, ETR, and chlorophyll content of the leaves, and can alleviate the copper-stress-induced increases of the qN, soluble protein content, activitiesofantioxidant enzymes,content ofH2O2 aswellas coppercontentsin theleavesandroots. Ourresultsindicatethat the attapulgite clay can reduce the absorption of available Cu2+ by adsorbing or immobilizing free and exchangeable Cu2+ in the matrix, thus relieving the physiological pressure caused by Cu2+ on plants ,which is propitious to its growth.And in the order of the mitigation is 1/70> 1/50> 1/20≧ 1/100> 0/1, this is due to the fact that when there is too much attapulgite clay in the matrix, the absorption of Cu2+ in the matrix will also affect the original physical properties of the matrix such as aeration, permeability and pH and so on. These results together showed that the attapulgite clay in the matrix can alleviate the copper-induced physiological stress on A. sinensisseedlings. This research would also provide a wealth
Hits
Hits
Downloads
Comment