Abstract: The physiological effects of S-07 on rice seedling was presented in this paper. As rice seed were soaked in S-07 solution at 1-10 mg/kg, the photosynthetic rate of rice seedling were promoted, and respiratory rate of rice seedling were increased. At high concentration (100-1000 mg/kg), respiratory rate of rice seedling were inhibited. The antagonism on the growth of rice seedling between S-07 and exogenous IAA orGA₃ was observed, and the additive effect existed between the inhibiting effect of S-07 and the effect of controlling growth on rice seedling under high concentration of exogenous IAA (100 mg/kg). The germinating potential of rice seed was reduced by soaking rice seed in S-07 solution. The results of anatomical observation of leaf sheath has shown that the cell size of the leaf sheath treated by S-07 was smaller than that of the control, and number of cell layers in leaf sheath was increased.

Key words: Antagonism effect, Exogenous IAA, Photosynthetic rate, Respiratory rate, Uniconazole

摘要： 就烯效唑浸种对稻苗的生理效应进行了研究，烯效唑浸种可提高稳苗光合效率，在浸种浓度1～10 mg/kg范围内，烯效唑浸种提高稻苗呼吸强度，浸种浓度高于10 mg/kg，则减弱稻苗呼吸强度。外源生长素。赤霉素与烯效唑控制稻苗生长的作用有拮抗效应，外源生长素（吲哚乙酸）高浓度（100 mg/kg）抑制稻生长，它与烯效唑控长作用有加合效应，效唑浸种减弱水稻种子发芽势，此与 烯效唑浸种降低种子α－淀粉酶活性有关。烯效唑浸种使稻苗矮壮的生物学基础是使得稻苗的细胞变小，组织的细胞层数增加。

关键词: 烯效唑, 水稻, 生理效应