外源ABA对渗透胁迫下玉米幼苗根系渗透调节的影响

用ABA处理不同抗旱性的两个玉米品种幼苗根系, 测定了根系的水势、渗透势、渗透调节能力及4种渗透调节物质的变化, 结果表明: 渗透胁迫条件下, ABA能提高根系的水势、降低渗透势、增加渗透调节能力, 且对抗旱性强的鲁玉14号的作用大于抗旱性弱的掖单13号. 正常供水条件下, ABA处理对根系水势的提高有一定的作用, 但对渗透势及

The Effects of Exogenous ABA on Osmotic Adjustment in Maize Roots under Osmotic Stress

The maize roots were treated with ABA under osmotic stress. The water potential, osmotic potential, osmotic adjustment of maize roots and 4 kinds of soluble materials were measured. It is indicated that, ABA decreased the osmotic potential, increased the osmotic adjustment and water potential in maize roots under osmotic stress, and the effect of ABA on Luyu No.14(a drought resistant variety) is greater than Yedan No. 13(a drought sensitive one). Under normal condition, ABA can increase the water potential of the maize roots in a way, but it has no effects on the osmotic potential. The exogenous ABA can observably increase the concentration of proline in roots not only under osmotic stress but also under normal water condition. ABA can also increase the concentration of soluble sugar under osmotic stress in a way, but have no observably effect on free amino acid and K +. The effect of ABA on accumulating proline can restrain by cycloheximide(CHI) which is a protein synthesis inhibitor. This result suggests that the effect of ABA on proline is related with the gene expression