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Sodium Hydrosulfide Mitigates Cadmium Toxicity by Promoting Cadmium Retention and Inhibiting Its Translocation from Roots to Shoots in Brassica napus
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2018-12-20 00:00:00 , DOI: 10.1021/acs.jafc.8b04622 Yan Yu 1 , Xiangyu Zhou 1 , Zonghe Zhu 1 , Kejin Zhou 1
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2018-12-20 00:00:00 , DOI: 10.1021/acs.jafc.8b04622 Yan Yu 1 , Xiangyu Zhou 1 , Zonghe Zhu 1 , Kejin Zhou 1
Affiliation
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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.
中文翻译：
硫化钠通过促进镉保留并抑制其从甘蓝型油菜的根向芽转移而减轻镉的毒性。
研究了硫化氢（H 2 S）和细胞壁成分之间的关系，以减轻甘蓝型油菜中镉（Cd）的毒性。Cd引起甘蓝型油菜根系的生长发育迟缓，叶片萎黄和内源性H 2 S含量降低。用H 2刺激l-半胱氨酸脱氢酶（LCD）介导的H 2 S产生S释放剂（NaHS）显着改善了植物的生长，降低了茎和叶中Cd的含量，并挽救了Cd引起的萎黄病。此外，在根细胞壁中观察到Cd保留增加，这表明NaHS减少了Cd从根向上部植物部分的移动。外源NaHS还显着增加了根细胞壁中果胶的含量和果胶甲基酯酶的活性，从而增加了果胶级分中Cd的保留率。然而，H 2 S的强化几乎不会影响Cd胁迫下的半纤维素含量。因此，增强的H 2 S信号通过增加果胶含量及其去甲基化，增加细胞壁中Cd的固定以及减少根茎Cd的易位性来减轻甘蓝型油菜中Cd的毒性。
更新日期：2018-12-20
中文翻译：
硫化钠通过促进镉保留并抑制其从甘蓝型油菜的根向芽转移而减轻镉的毒性。
研究了硫化氢（H 2 S）和细胞壁成分之间的关系，以减轻甘蓝型油菜中镉（Cd）的毒性。Cd引起甘蓝型油菜根系的生长发育迟缓，叶片萎黄和内源性H 2 S含量降低。用H 2刺激l-半胱氨酸脱氢酶（LCD）介导的H 2 S产生S释放剂（NaHS）显着改善了植物的生长，降低了茎和叶中Cd的含量，并挽救了Cd引起的萎黄病。此外，在根细胞壁中观察到Cd保留增加，这表明NaHS减少了Cd从根向上部植物部分的移动。外源NaHS还显着增加了根细胞壁中果胶的含量和果胶甲基酯酶的活性，从而增加了果胶级分中Cd的保留率。然而，H 2 S的强化几乎不会影响Cd胁迫下的半纤维素含量。因此，增强的H 2 S信号通过增加果胶含量及其去甲基化，增加细胞壁中Cd的固定以及减少根茎Cd的易位性来减轻甘蓝型油菜中Cd的毒性。
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