摘要
研究了烯效唑对＾３Ｈ－色氨酸合成＾３Ｈ－ＩＡＡ的效率及对ＩＡＡ氧化酶活性的影响，以探讨烯效唑延缓植物生长的作用机理，结果表明，烯效唑对水稻幼苗生长的控制效应与其降低内源ＩＡＡ含量有关，烯效唑浸种处理降低水稻幼苗内源ＩＡＡ含量有两条途径，其一是提高水稻幼苗ＩＡＡ氧化酶活性，增强内源ＩＡＡ的氧化；其二是阻抑内源ＩＡＡ的合成。烯效唑除阻抑内源赤霉素的生物合成而延缓作物生长外。
Two rice (Oryza sativa L.) cultivars, tall cv. 'Taizongyu 65' and dwarf cv.'Jiangsu' ai' ,were used in the experiments to study the biological efficacy of pentefezol (S-07) to endogenous IAA in rice seedlings. When rice seeds were soaked in S-07 solution for a period of time, the rice seedlings were dwarfed as the content of endogenous IAA was reduced. The results indicated that S-07 enhanced the activity of IAA-oxidase and reduced the rate of transformation of 3H-tryptophan into H-IAA. Thus the endogenous IAA content of rice seedlings were reduced by S-07 treatment leading to subsequent retardation of the growth rate of seedlings. Moreover the rate of distribution of 3H-IAA in leaves and roots of rice seedlings were also reduced by S-07 treatment.
基金
农业部"八五"重点课题(08-02)
浙江省"八五"攻关专题(913238)资助
关键词
水稻
幼苗
烯效唑
吲哚乙酸
Rice, Seedling, Endogenous IAA, lAA-oxidase, Tryptophan, Pentefezol
