半胱氨酸通过调节抗氧化系统缓解 NaCl 盐毒性对亚麻（Linum usitatissimum L）植物的影响。
Cysteine mitigates the effect of NaCl salt toxicity in flax (Linum usitatissimum L) plants by modulating antioxidant systems.
机构信息
Botany and Microbiology Department, Faculty of Science (Girls Branch), Al-Azhar University, Cairo, 11754, Egypt.
Biology Department, University College of Nairiyah, University of Hafr Al-Batin (UHB), Nairiyah, 31991, Saudi Arabia.
出版信息
Sci Rep. 2022 Jul 5;12(1):11359. doi: 10.1038/s41598-022-14689-7.
Agriculture, the main water-consuming factor, faces a global water scarcity crisis. Saline water is an alternative water source, while excess NaCl decreases plant growth and productivity of crops. L-cysteine (Cys) is a promising thiol amino acid in plant growth and development. Flax; Linum usitatissimum L. is an economical plant with low salt tolerance. NaCl salt stress at 50 and 100 mM inhibited the growth parameters, the photosynthetic pigments, total soluble sugars, total phenols, and amino nitrogen in flax plants. Salt stress led to a marked rise in proline and lipid peroxidation and altered the protein profile. Foliar application of cysteine at 0.8 and 1.6 mM mitigates the unfriendly effects of NaCl stress on flax plants. Cysteine enhanced the growth traits, photosynthetic pigments, amino nitrogen, total phenols, and new polypeptides in NaCl-stressed plants. However, cysteine declined the total sugars, proline, the activity of peroxidase, and ascorbate peroxidase. The results confirmed that cysteine had reductant properties. Furthermore, it decreased the NaCl oxidative stress and maintained the stability of membranes by lowering lipid peroxidation. Overall, the redox capacity of L-cysteine is the cause behind its potential counteracting of the adverse effects of NaCl toxicity on the growth of flax plants.
农业是主要的耗水因素，面临着全球水资源短缺危机。咸水是一种替代水源，而过量的 NaCl 会降低植物的生长和农作物的生产力。L-半胱氨酸（Cys）是一种在植物生长和发育中很有前途的硫醇氨基酸。亚麻；Linum usitatissimum L. 是一种具有低耐盐性的经济型植物。50 和 100 mM 的 NaCl 盐胁迫抑制了亚麻植物的生长参数、光合色素、总可溶性糖、总酚和氨基酸氮。盐胁迫导致脯氨酸和脂质过氧化显著增加，并改变了蛋白质图谱。在 0.8 和 1.6 mM 时，半胱氨酸叶面喷施可减轻 NaCl 胁迫对亚麻植物的不良影响。半胱氨酸增强了 NaCl 胁迫下植物的生长特性、光合色素、氨基酸氮、总酚和新多肽。然而，半胱氨酸降低了总糖、脯氨酸、过氧化物酶和抗坏血酸过氧化物酶的活性。结果证实半胱氨酸具有还原性质。此外，它通过降低脂质过氧化作用降低 NaCl 氧化应激，保持膜的稳定性。总的来说，L-半胱氨酸的氧化还原能力是其潜在地抵消 NaCl 毒性对亚麻植物生长的不良影响的原因。
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