盐胁迫对番茄几个形态及生理指标的影响

Effect of Salt Stress on Some Morphological and Physiological Index of Tomato

[目的]为建立番茄耐盐评价体系，筛选耐盐番茄品种。[方法]研究了不同浓度NaCl对番茄的株高、根长、根毛数量等的形态指标以及幼苗叶片叶绿素含量、可溶性蛋白质含量、幼苗相对电导率、幼苗叶片内丙二醛（MDA）含量等生理指标的影响。[结果]随着NaCl浓度的升高，株高、根长显著降低；随着盐处理时间的增加，新发根数逐渐减少。在生理指标方面，当NaCI浓度在0～0．4％范围内，叶片内叶绿素含量缓慢升高，在0．4％浓度时达到最大值，当浓度超过0．4％时，大幅度降低。叶片内可溶性蛋白质含量对NaCl呈浓度依赖性，在0．2％～1．2％NaCl范围内，番茄幼苗叶片中可溶性蛋白质含量先上升后下降。随着胁迫时间的延长，番茄幼苗叶片质膜透性增大，丙二醛含量递增。[结论]番茄的耐盐性是体内一系列生理生化综合调控的结果。

[ Objective ] The research aimed to establish tomato salt-tolerance evaluation system and screen salt-tolerant tomato varieties. [ Method ] The effect of different concentrations of NaCI on tomato plant height, root length, new generation root hair quantity and tomato leaf chloro- phyll content, soluble protein content, relative electrical conductivity of seedlings, and seedling of malondialdehyde （MDA） contents were stud- ied. [ Result] With the NaC1 concentration increased, plant height and root length were significantly reduced. With the increase of salt treatment time, the new generation root hair quantity decreased. In physiology, when NaC1 concentration in 0 -0.4% range, the leaf chlorophyll contents increased slowly. However, when the concentration exceeded 0.4%, the leaf chlorophyll contents significantly reduced. Soluble protein contents in leaves was NaC1 concentration dependent, in 0.2% - 1.2% NaC1 range, seedling soluble protein content increased and then decreased. With the increase of stress period, both the leaves membrane permeability and MDA content increased. [ Conclusion] The salt resistance of tomato was the result of integration reaction.