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Sodium Hydrosulfide Mitigates Cadmium Toxicity by Promoting Cadmium Retention and Inhibiting Its Translocation from Roots to Shoots in Brassica napus

Yu, Yan, Zhou, Xiangyu, Zhu, Zonghe, Zhou, Kejin
Journal of agricultural and food chemistry 2018 v.67 no.1 pp. 433-440
Brassica napus, cadmium, cell wall components, cell walls, chlorosis, cysteine, demethylation, hemicellulose, hydrogen sulfide, leaves, pectinesterase, pectins, plant growth, roots, shoots, sodium, stems, toxicity
The association between hydrogen sulfide (H₂S) and cell wall composition with regard to the mitigation of cadmium (Cd) toxicity in Brassica napus L. was investigated. Cd caused growth retardation, leaf chlorosis, and decreased endogenous H₂S content in Brassica napus roots. Stimulating l-cysteine desulfhydrase (LCD)-mediated H₂S production with H₂S releaser (NaHS) markedly improved plant growth, reduced Cd content in stems and leaves, and rescued Cd-induced chlorosis. Furthermore, increased Cd retention was observed in root cell walls, indicating that NaHS reduced Cd movement from the roots to upper-plant parts. Exogenous NaHS also significantly increased the content of pectin and the activity of pectin methylesterase in cell walls of roots, thereby increasing Cd retention in pectin fractions. However, intensification of H₂S barely affected hemicellulose content under Cd stress. Intensified H₂S signal, therefore, alleviates Cd toxicity in Brassica napus by increasing pectin content and its demethylation, increasing Cd fixation in cell walls, and reducing root-to-shoot Cd translocation.