外源ABA对杂交水稻制种F_1穗芽的抑制效应

“穗芽”是我国发展杂交稻的技术难点之一,至今尚无有效控制措施。据研究外源ＡＢＡ对杂 交水稻制种Ｆ_１种子穗芽抑制效应显著。实验结果表明,于齐穗后施用ＡＢＡ抑制穗芽的作用有效浓度 为７５ｍｇ／Ｌ,施用剂量（有效成分ａ．ｉ．）为 ０．３８ｍｇ／ｈｉｌｌ;在本试验条件下,外源ＡＢＡ对杂交稻制种Ｆ_１ 种子、不育系繁种种子以及常规稻种子均有抑制穗芽的作用。此外,杂交水稻制种田为调花期与增穗 使用外源ＧＡ_３,抽穗期间雨日多寡等影响外源ＡＢＡ抑制穗芽的效果。外源ＡＢＡ处理过的种子经贮 藏,未发现其种子活力下降。

Effects of Exogenous ABA on Panicle Sprouting of F_1 in Hybrid Rice Seed Production

Panicle sprouting" is one of the major problems in hybrid rice development, there is no an effective technique to solve the problem so far. It was demonstrated by our experiments that panicle sprouting could be effectively inhibited by timely application of exogenous ABA. The results showed that effective concentrations of ABA in this experiment is 75 ml/L and the dosage is 0. 38 mg/hill. Exogenous ABA can inhibit panicle sprouting in hybrid rice F1 seed and conventional rice seed production in this experiment condition. These factors as GA3, precipitation during heading time in the seed production field will affect the ABA inhibiting efficiency. It was not found anything negative on F1 germination rate in ABA treatment after a period of storage.