Key Laboratory of Saline-Alkali Vegetation Ecology Restoration (Northeast Forestry University), Ministry of Education, Harbin, 150040, China.
College of Life Sciences, Northeast Forestry University, Harbin, 150040, China.
Sci Rep. 2020 Oct 26;10(1):18228. doi: 10.1038/s41598-020-75349-2.
Plant salt tolerance is a complex mechanism, and different plant species have different strategies for surviving salt stress. In the present study, we analyzed and compared the morphological and physiological responses of two willow species (Salix linearistipularis and Salix matsudana) from different habitats to salt stress. S. linearistipularis exhibited higher seed germination rates and seedling root Na efflux than S. matsudana under salt stress. After salt treatment, S. linearistipularis leaves exhibited less Na accumulation, loss of water and chlorophyll, reduction in photosynthetic capacity, and damage to leaf cell structure than leaves of S. matsudana. Scanning electron microscopy combined with gas chromatography mass spectrometry showed that S. linearistipularis leaves had higher cuticular wax loads than S. matsudana leaves. Overall, our results showed that S. linearistipularis had higher salt tolerance than S. matsudana, which was associated with different morphological and physiological responses to salt stress. Furthermore, our study suggested that S. linearistipularis could be a promising tree species for saline-alkali land greening and improvement.
植物耐盐性是一个复杂的机制，不同的植物物种有不同的策略来应对盐胁迫。在本研究中，我们分析和比较了来自不同生境的两种柳树（柳杉和毛白杨）对盐胁迫的形态和生理响应。在盐胁迫下，柳杉的种子萌发率和幼苗根 Na 外排率均高于毛白杨。盐处理后，柳杉叶片的 Na 积累、水分和叶绿素损失、光合能力下降以及叶片细胞结构损伤均小于毛白杨叶片。扫描电子显微镜结合气相色谱-质谱联用分析表明，柳杉叶片的角质层蜡负载量高于毛白杨叶片。总的来说，我们的结果表明，柳杉的耐盐性高于毛白杨，这与它们对盐胁迫的不同形态和生理响应有关。此外，我们的研究表明，柳杉可能是一种有前途的盐碱地绿化和改良树种。
