申请人:ARNOLD WHITE & DURKEE
公开号:US20020053095A1
公开(公告)日:2002-05-02
Methods and materials are disclosed for the inhibition and control of gibberellic acid levels. In particular, nucleic acid sequences of copalyl diphosphate synthase, 3-&bgr; hydroxylase, and 2-oxidase and additional nucleic acid sequences are disclosed. Gibberellic acid levels may be inhibited or controlled by preparation of a chimeric expression construct capable of expressing a RNA or protein product which suppresses the gibberellin biosynthetic pathway sequence, diverts substrates from the pathway or degrades pathway substrates or products. The sequence is preferably a copalyl diphosphate synthase sequence, a 3&bgr;-hydroxylase sequence, a 2-oxidase sequence, a phytoene synthase sequence, a C20-oxidase sequence, and a 2&bgr;,3&bgr;-hydroxylase sequence. Administration of a complementing agent, preferably a gibberellin or gibberellin precursor or intermediate restores bioactivity.
本研究公开了抑制和控制赤霉素水平的方法和材料。特别是公开了 copalyl diphosphate synthase、3-&bgr; hydroxylase 和 2-oxidase 的核酸序列和其他核酸序列。赤霉素水平可以通过制备嵌合表达构建体来抑制或控制,该构建体能够表达抑制赤霉素生物合成途径序列、转移途径底物或降解途径底物或产物的 RNA 或蛋白质产物。该序列最好是共醛基二磷酸合成酶序列、3&bgr;-羟化酶序列、2-氧化酶序列、植物烯合成酶序列、C20-氧化酶序列和 2&bgr;,3&bgr;-羟化酶序列。施用补充剂,最好是赤霉素或赤霉素前体或中间体,可恢复生物活性。