不同耐盐性植物在盐胁迫下的生长与生理特性比较研究

Comparative study on vegetal and physiological characteristics of different salt-tolerant plants under salt stress.

对不同耐盐性植物厚叶石斑木(Raphiolepis umbellata)、桑(Morus alba)和月季(Rosachinensis)在盐胁迫下的新梢、新根生长量等形态指标,以及Na+、K+、Na+/K+,游离脯氨酸、叶绿素含量、光合速率、气孔导度、蒸腾速率等生理指标的比较研究表明:盐对3种植物生长的影响随浓度的升高和胁迫时间的延长而增加;Na+、K+等无机离子是厚叶石斑木主要的渗透调节物质,而在桑和月季中则为游离脯氨酸;叶绿素含量、光合速率等生理指标随盐浓度升高先升后降,变化幅度:月季>桑>厚叶石斑木;3种植物耐盐能力由强至弱依次为厚叶石斑木、桑和月季.

To study the salt-tolerant mechanism of different salt-tolerant plants, determined the growth of young shoots, the number of new roots and some physiological indexes, such as Na^＋ , K^＋ content, the Na^＋/K^＋ ratio, proline, chlorophyll content, the photosynthetic rate, stomatal conductance and the transpiration rate of three species, Raphiolepis umbellata, Morus alba and Rosa chinensis. Comparative study show that when the concentrations of solution add and stress time prolong, the impacts of salt-stress increase; the main osmotica of Raphiolepis umbellata under salt-stress is inorganicion, while for Morus alba and Rosa chinensis are praline; when concentrations add, physiological indexes, including chlorophyll content, the photosynthetic rate, stomatal conductance and the transpiration rate increase at first and then decrease, and the range of change in order is Rosa chinensis, Morus alba and Raphiolepis umbellata. It can be concluded that the capability of salt-tolerance of Raphiolepis umbellata is the largest, and then are Morus alba and Rosa chinensis.