NaCl胁迫下玉米黄化苗质外体和共质体Na、Ca浓度的变化

低浓度ＮａＣｌ短期处理促进玉米黄化苗根和地上部分的伸长生长，高浓度ＮａＣｌ短期胁迫则抑制根和地下部分的伸长生长。根和地上部分的含水量在本实验条件下并不受ＮａＣｌ胁迫的影响。而根和地上部分Ｎａ含量ＮａＣｌ浓度的增加和胁迫时间的延长而增加，总Ｃａ含量则下降。ＮａＣｌ胁迫下，根和地下部分质外体和共质中Ｎａ含量均明显增加，但质外体中Ｎａ一增更为明显，１５０ｍｏｌ／ｍ＾３ＮａＣｌ胁迫２４小时，根中质外体Ｎａ

Changes in Na and Ca Concentrations in the Apoplast And Symplast of the Etiolated Corn Seedlings under NaCl Stress

The elongation rate of the roots and shoots of the etiolated corn seedlings were stimulated when subjected to mildly saline(50 mol/m3 NaCl for 1,6 and 24 h),but inhibited when subjected to high concentration of NaC1(l00 and 150 mol/m3 for 1, 6 and 24 h). Water content of the roots and shoots were not significantly altered by NaCl stress under the condition of the paper. Total Na concentration of the roots and shoots increased under NaCl stress, but total Ca decreased. Na concentration in apoplast of roots and shooots both increased under NaCl stress, and it increased much higher in apoplast of roots than in that of shoots. Ca concentration in apoplast and symplast of the shoots declined under all of the levels of NaCl stress, But Ca concentration in apoplast of the roots increased under certain extent of NaCl stress and decreased above an extent of NaCl stress. The Ca concentration in symplast of roots declined under NaCl stress. The functions of Na and Ca in apoplast and symplast in salt tolerance were discussed.