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以毛叶山桐子(Idesia polycarpavar.vestita)1年生盆栽苗为对象,研究不同NaCl浓度胁迫对其生长与生理特性的影响。结果表明:毛叶山桐子在NaCl浓度<0.25%处理下,幼苗的形态特征、株高和地径变化趋势与无NaCl处理对照植株一致,生长影响不大;在NaCl浓度≥0.25%处理下,9d后大部分幼苗叶片萎蔫凋落,18d后大部分植株死亡。叶片中叶绿素a、谷胱甘肽(GSH)、抗坏血酸(HASA)、蔗糖含量与对照差异显著(P<0.05),叶绿素b、类胡萝卜素、丙二醛(MDA)、可溶性总糖变化与对照差异不显著,NaCl浓度的变化与光合色素和蔗糖含量的变化具有显著负相关。毛叶山桐子幼苗耐盐临界浓度在0.1%左右。
One-year potted seedlings of Idesia polycarpa var. Axita were used to study the effects of NaCl stress on their growth and physiological characteristics. The results showed that under the NaCl concentration of <0.25%, the trend of morphological characteristics, plant height and diameter of T. mongolicum seedlings was the same as that of the control plants without NaCl treatment. After the majority of seedling leaves wilt wilt, most of the plants died after 18d. The contents of chlorophyll a, GSH, HASA and sucrose in the leaves were significantly different from those in the control (P <0.05). The changes of chlorophyll b, carotenoids, malondialdehyde (MDA) The difference was not significant. The change of NaCl concentration was negatively correlated with the change of photosynthetic pigment and sucrose content. Thunbergii tree seedling salt critical concentration of about 0.1%.