Cinnamaldehyde Ameliorates Cadmium-Inhibited Root Elongation in Tobacco Seedlings via Decreasing Endogenous Hydrogen Sulfide Production

文献类型： 外文期刊

第一作者： Ye, Xie-Feng

作者： Ye, Xie-Feng;Ling, Tianxiao;Yu, Xiao-Na;Xue, Yanfeng;Wang, Yong;Cheng, Changxin;Feng, Guosheng;Hu, Liangbin;Shi, Zhiqi;Chen, Jian;Shi, Zhiqi;Chen, Jian

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关键词： cinnamaldehyde;hydrogen sulfide;reactive oxygen species;cell death;cadmium;tobacco

期刊名称：MOLECULES （ 影响因子：4.411； 五年影响因子：4.587 ）

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收录情况： SCI

摘要： Cinnamaldehyde (CA) is natural plant-derived compound that has been highly appreciated for its medicinal properties. However, little information is known about the regulation of plant intrinsic physiology by CA. To address these gaps, physiological, histochemical, and biochemical approaches were applied to investigate CA-facilitated cadmium (Cd) tolerance in the roots of tobacco (Nicotiana tabacum) seedlings. Treatment with CdCl2 at 20 M for 72 h resulted in the significant decrease in root elongation by 40.39% as compared to control. CA alleviated Cd-inhibited root elongation in dose- and time-dependent manners. The addition of CA at 20 M induced significant increase in root elongation by 42.58% as compared to Cd treatment alone. CA abolished Cd-induced ROS (reactive oxygen species) accumulation, lipid peroxidation, loss of membrane integrity, cell death, and free Cd2+ accumulation in roots. CA blocked the Cd-induced increase in the endogenous H2S level through the down-regulation of d-cysteine desulfhydrase (DCD) expression. H2S scavenger hypotaurine (HT) or potent H2S-biosynthetic inhibitor dl-propargylglicine (PAG) were able mimic the action of CA on the blockade of Cd-induced H2S accumulation, cell death, and growth inhibition. Enhancement of the endogenous H2S level with NaHS (H2S donor) abrogated all the beneficial capabilities of CA, HT, and PAG. Collectively, these results suggest that CA has great potential to confer plant tolerance against Cd stress, which is closely associated with its capability to inhibit Cd-induced H2S production. This study not only provides evidences for the regulation of plant physiology by CA but also sheds new light on the cross-talk between CA and H2S in physiological modulations.

分类号： O62

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