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通过对叶面喷施S330 7,研究了S330 7对烤烟烟苗生长情况及某些生理特性的影响。结果表明 ,在大十字期喷施S330 7可以抑制烟苗节间的伸长 ,降低烟苗株高 ;烟苗的根冠比提高10 9%～ 15 7% ;降低烟苗叶组织中自由水含量 ,提高束缚水含量 ,束缚水与自由水的比值增加0 .7%～ 2 7.9% ;S330 7处理烟苗POD活性提高 34.9%～ 4 2 .8% ,叶组织中游离脯氨酸含量降低2 8.7%～ 4 5 .5 % ,降低了低温下叶组织相对膜透性和膜伤害度。S330 7喷施烟苗 ,还降低了叶片中内源赤霉素水平 ,提高了细胞分裂素含量
The effect of S330 7 on the growth and some physiological characteristics of tobacco seedlings was studied by spraying S330 7 on the leaves. The results showed that spraying S330 7 in large cross could restrain the elongation of tobacco seedling internodes and reduce the plant height of tobacco seedlings. The root / shoot ratio of tobacco seedlings increased by 10 9% -15 7%, and the free water The ratio of irreducible water to free water increased by 0.7% -2 7.9%. The activity of POD increased by 34.9% -4.28% in S330 7 treatment, and the content of free proline in leaf tissue was decreased 2 8.7% ~ 45.5%, which reduced the relative membrane permeability and membrane damage of leaf tissue under low temperature. S330 7 spraying tobacco, also reduced the level of endogenous gibberellin in leaves, increased cytokinin content