高粱叶中有机渗透调节物质对NaCl胁迫的响应

用抗盐品种独角虎和盐敏感品种糖高粱为材料，研究了ＮａＣｌ胁迫下成熟叶和生长吸及其叶鞘有机渗透调节含变化。

RESPONES OF THE ORGANIC OSMOTIC ADJUSTMENT SOLUTES IN THE LEAVES OF SORGHUM TO NaCl STRESS

The changes in organic osmotic adjustment solute contents in the mature and young blades and their sheathes of salt-tolerant(Du Jiao Hu)and salt-sensitive(Tang Gao Liang) Sorghum seedlings under NaCl stress were studied.Under NaCl stress,the growth inhibition of young leaf of both cultivars was bigger than that of mature leaf,the sheath bigger than that of the blade,and Tang Gao Liang bigger than that of Du Jiao Hu.Water potential and osmotic potential of the leaves were all decreased by NaCl stress,and the decrease of the water and osmotic potential of Tang Gao Liang was bigger than those of Du Jiao Hu,but no singificant change in the pressure potential was detected.Under NaCl stress,proline,total free amino acid,total soluble sugars and sucrose contents in the mature and young blades and their sheathes of both cultivars were markedly increased,and the degree of the increase was in orders:young leaves>mature leaves and Tand Gao Liang>Du Jiao Hu.The proline,total free amino acid,total soluble sugars and sucrose contents in the young blades of control plants were all higher than their sheathes.However,the four solute contents in the sheathes of NaCl-stressed plants were much higher than those in the blades.