化学
谷胱甘肽
谷胱甘肽还原酶
超氧化物歧化酶
抗坏血酸
过氧化氢酶
丙二醛
抗氧化剂
生物化学
脯氨酸
砷
砷毒性
植物螯合素
食品科学
酶
谷胱甘肽过氧化物酶
氨基酸
有机化学
作者
Cengiz Kaya,Muhammad Ashraf
标识
DOI:10.1016/j.envpol.2021.118608
摘要
The main intent of the current research was to appraise if combined application of hydrogen sulfide (H2S, 0.2 mM) and silicon (Si 2.0 mM) could improve tolerance of tomato plants to arsenic (As as sodium hydrogen arsenate heptahydrate, 0.2 mM) stress. Plant growth, chlorophylls (Chl), PSII maximum efficiency (Fv/Fm), H2S concentration and L-cysteine desulfhydrase activity were found to be suppressed, but leaf and root As, leaf proline content, phytochelatins, malondialdehyde (MDA) and H2O2 as well as the activity of lipoxygenase (LOX) increased under As stress. H2S and Si supplied together or alone enhanced the concentrations of key antioxidant biomolecules such as ascorbic acid, and reduced glutathione and the activities of key antioxidant system enzymes including catalase (CAT), superoxide dismutase (SOD), dehydroascorbate reductase (DHAR), glutathione reductase (GR), and glutathione S-transferase (GST). In comparison with individual application of H2S or Si, the joint supplementation of both had better effect in improving growth and key biochemical processes, and reducing tissue As content, suggesting a putative collaborative role of both molecules in improving tolerance to As-toxicity in tomato plants.
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