Comparison and Characterization of Oxidation Resistance and Carbohydrate Content in Cd-Tolerant and -Sensitive Kentucky Bluegrass under Cd Stress

Kentucky bluegrass (Poa pratensis L.), a turf grass species that is hypertolerant of cadmium (Cd), potential phytoremediation material for soil polluted with Cd. However, the mechanism Cd phytotoxicity in unclear. Here, we compared phenotype, induction oxidative stress, and structural non-structural carbohydrate contents between Cd-tolerant genotype (‘Midnight’, M) Cd-sensitive (‘Rugby’, R). The results showed both genotypes accumulated more roots, whereas R distributed into leaves M genotype. In genotypes, inhibited length fresh weight roots; increased peroxidase (POD) activity but ascorbate (APX) catalase (CAT) activity; superoxide radical (O2−), hydrogen peroxide (H2O2), malondialdehyde (MDA) contents. exhibited lower root inhibition, H2O2 MDA confirmed had accumulation resistance, while better distribution Moreover, stress significantly soluble sugar, trehalose, sucrose genotypes. Pectin, lignin, cellulose were to prevent entry roots. Cd-induced growth inhibition physiological responses preliminarily explored herein, chelation pectin, lignification, antioxidant response being possible contributors detoxification bluegrass. addition, increase sucrose, sugar might play pivotal role defense against