6─BA提高玉米幼苗抗旱性机理初探

Preliminary Research on Mechanism of 6-BA on Increasing Drought Resistance in Maize Seedlings

叶面喷施１０－５ｍｏｌ／Ｌ的６─ＢＡ可以提高水分胁迫条件下玉米幼苗的光合速率、叶绿素含量、光合效化酶及细胞保护酶活性，降低气孔阻力和ＭＤＡ含量，减轻水分胁迫下活性氧对膜的伤害，增强玉米幼苗的抗旱性．

Efficiency of 6-BA(10-5mol/L) pretreatment as foliar spray in restoring the metabolic alterations relating to chlorophyll content,net photosynthetic rate,photosynthetic carboxylase activity and the activties of protective enzymes as imposed by water stress was investigated in maize seedlings. It was noted that in maize treated with 6-BA,the decreasing of photosynthetic rate and content of chlorophyll was inhibited,and the ribulose-1, 5-bisphos phate carboxylase oxygenase (RuBPC ), phosphoenolpyruvate carboxylase(PEPC), pyruvate phophate dikinase(PPDK ), superoxide dismutase(SOD), peroxidase(POD) and catalase(CAT) activities were increased while the stomatal resistance and the content of malondialdehyde(MDA) were decreased. Thus 6-BA reduced the damage of activited oxygen on membrance by water stress and increased the drought resistance.