Iminodisuccinic Acid Relieved Cadmium Stress in Rapeseed Leaf by Affecting Cadmium Distribution and Cadmium Chelation with Pectin

Rapeseed (Brassica napus L.) is a nutritious vegetable, while cadmium (Cd) pollution threatens the growth, productivity, and food security of rapeseed. By studying effects iminodisuccinic acid (IDS), an easily biodegradable environmental friendly chelating agent, on Cd distribution at organ cellular level, we found IDS promoted dry matter accumulation rapeseed increased contents photosynthetic pigment in leaves. Inhibited root-shoot transport resulted higher activity antioxidant enzymes decreased hydrogen peroxide (H2O2) malondialdehyde (MDA) leaves, which indicated that contributed to alleviating Cd-caused oxidative damage leaf cells. Additionally, subcellular cell wall (CW), especially covalently bound pectin (CSP), relieved toxicity organelle also enhanced demethylation CSP. The content CSP, degree, methylesterase CSP by 37.95%, 13.34%, 13.16%, respectively, did not change different CW components. improved fixation was mainly attributed enhance (CSP) chelation with