盐生植物獐毛耐盐基础生理的研究

Study on the Basic Physiology of Salt-tolerance in the Halophytic Aeluropus littoralis var. sinensis Debeaux

用不同盐溶液处理材料,獐毛对Na+、K+和Ca2+的吸收和分泌均表现为具有不同的选择性,分泌量的顺序为Na+>K+>Ca2+,并且仅仅24 h内,盐分的分泌量就已经超过了叶片内含量,说明獐毛具有较强的泌盐能力.显微观察结果显示,獐毛盐腺为典型的双细胞结构,主要分布在叶脉附近,这样有利于它快速收集来自根部的盐离子.

The salt glands of Aeluropus littoralis var. sinensis Debeaux had different selection in absorbing and secreting Na^＋ ,K^＋ and Ca^2 ＋ , the order of secretion of the three ions was found to be Na^＋ 〉 K^＋ 〉 Ca^2 ＋ . The secretion of ions was respectively higher than that of leaves within 24 h, which shows the plant had ability to secret salinity in a degree. It showed that the upper - epidermis had almost the same number of salt glands as the lower - epidermis and the salt gland is the typical bicelluar gland, when the leaves were scanned with a scanning electron microscope. These salt glands were distributed mainly on the leaf veins, which favors the rapid collection of salts from the roots, and then decrease the salinity of the plant.