Collaborative Innovation Center of Sustainable Forestry in Southern China of Jiangsu Province, Nanjing Forestry University, Nanjing 210037, China.
Department of Forest Resources Management and Faculty of Science, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
Int J Mol Sci. 2022 Aug 19;23(16):9331. doi: 10.3390/ijms23169331.
Soil salinization is one of the main environmental factors affecting plant growth worldwide. Ledeb. () is a halophyte representative that is widely grown in salinized soils. As an important nutrient element for plant growth, K plays an important role in improving the tolerance to salt stress, but the mechanism of reducing the damage caused by NaCl stress to is less reported. Our results show that the proline content and the Log fold-change of proline's relative quantification in the roots of increased over time with the application of exogenous potassium (K) for 48 h and 168 h under NaCl stress. Moreover, 13 amino-acid-related metabolic pathways were involved in the resistance of to salt stress. Mainly, the aldehyde dehydrogenase family genes and tryptophan-synthase-related genes were found at 48 h and 168 h with exogenous potassium applied to the roots of under NaCl stress, and they regulated their related metabolic accumulation in the arginine and proline metabolism pathways, increasing the effectiveness of inducing NaCl tolerance of . It is noteworthy that alpha-ketobutyric was produced in the roots of under NaCl stress for 48 h with the application of exogenous potassium, which is one of the most effective mechanisms for inducing salt tolerance in plants. Meanwhile, we found three DEGs regulating alpha-ketobutyric acid. This study provides a scientific theoretical basis for further understanding the molecular mechanism of K alleviating the salinity damage to caused by NaCl.
土壤盐渍化是影响全球植物生长的主要环境因素之一。盐节木（）是一种广泛生长在盐渍化土壤中的盐生植物代表。钾（K）作为植物生长的重要营养元素，在提高耐盐性方面发挥着重要作用，但关于 K 降低 NaCl 胁迫对盐节木伤害的机制报道较少。我们的结果表明，在 NaCl 胁迫下，施加外源钾后，盐节木根中脯氨酸含量和脯氨酸相对定量的 Log 倍变化随时间推移而增加，分别在 48 h 和 168 h 时达到最高。此外，盐节木对盐胁迫的抗性涉及 13 种与氨基酸相关的代谢途径。主要是在施加外源钾后 48 h 和 168 h 时，醛脱氢酶家族基因和色氨酸合成酶相关基因被发现，它们调节了盐节木中精氨酸和脯氨酸代谢途径中的相关代谢积累，提高了 K 诱导盐节木耐盐性的效果。值得注意的是，在施加外源钾后，盐节木根中在 48 h 时产生了α-酮丁酸，这是植物诱导耐盐性的最有效机制之一。同时，我们发现了三个调控α-酮丁酸的 DEGs。本研究为进一步了解 K 缓解 NaCl 对盐节木伤害的分子机制提供了科学的理论依据。
