盐胁迫下蒙古冰草幼苗生长和离子含量的变化

用不同浓度的NaCl溶液处理蒙古冰草幼苗后,测定了不同时间胁迫下植株地上部分鲜重和离子含量。结果表明:轻度盐胁迫对蒙古冰草幼苗的生长有一定的促进作用,而中度和重度盐胁迫对幼苗生长有明显的抑制作用。经分析认为,轻度盐胁迫下蒙古冰草可以将Na⁺等有害离子截流在根部,抑制其向地上部分的运输,而中度和重度盐胁迫下过多的Na⁺等有害离子运输到地上代谢活跃部分,限制了对K⁺、Ca²⁺等的吸收,造成植株的营养亏缺,从而引起植株的伤害。

Effect of NaCl stress on growth and content of severalions of wheatgrass

Different concentration of NaCl was used to treat the seedings of wheatgrass, we studied the effect of salt stress on fresh weight and ion content of leaves of wheatgrass. The result showed that wheatgrass seedlings can keep growth in slight salt stress. But in middle or severe stress, growth of the seedlings was restrained distinctly. So we considered that the seedlings of wheatgrass can prevent Na + from transporting to upgroud by withholding Na + in root. This can keep the balance of ion of upground. But in middle or severe salt stress, the upgroud of seedlings accumulated superabundance of Na +, limited the uptake of K + and Ca 2+, seedlings was damaged heavily.