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GA_(3)对杂交稻“粒间顶端优势”及灌浆期间籽粒内源IAA的影响

王熹, 陶龙兴, 俞美玉, 黄效林

中国水稻研究所.浙江,杭州 310006

摘要

以杂交稻协优413为材料,研究了外源GA_(3)对籽粒内源IAA影响。观察到开花后其优势粒比劣势粒灌浆启动早,优势粒灌浆势下降后,劣势粒开始灌浆,且优势粒灌浆势峰值比劣势粒高,这种优劣势粒的灌浆异步现象是一种“粒间顶端优势”,即劣势粒的灌浆启动迟,与优势粒对劣势粒的抑制有关。籽粒灌浆期间优势粒内源IAA含量增加早于劣势粒,优势粒内源IAA峰值也高于劣势粒;优劣势粒灌浆势变化趋势与优劣势粒内源IAA含量水平的变化趋势相似,“粒间顶端优势”似为内源IAA所调节。于初穗时喷施外源GA_(3),“放大”了单穗中优劣势粒灌浆异步效应,优势粒灌浆势更强,劣势粒更弱,即外源GA_(3)加强“粒间顶端优势”现象。

关键词： 杂交稻; 粒间顶端优势; 内源IAA; 灌浆势

Effect of exogenous GA_(3) on “inter-grain apical dominance” and endogenous IAA in grain filling stage of hybrid rice

Wang Xi, Tao Longxing, Yu Meiyu, Huang Xiaolin

China National Rice Research Institute.Hangzhou 310006,Zhejiang

Abstract

The effect of exogenous GA_(3) on endogenous IAA level in both dominant grains and subordinate grains during grain filling stage was studied on hybrid rice plants of combination Xieyou 413 grown in paddy field and pots.

Key words: Hybrid rice;Inter grain apical dominance;Endogenous IAA;Increasing rate of grain weight

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引用本文：

王熹, 陶龙兴, 俞美玉, 黄效林. GA_(3)对杂交稻“粒间顶端优势”及灌浆期间籽粒内源IAA的影响[J]. 生理学报 2000; 52 (3): .

Wang Xi, Tao Longxing, Yu Meiyu, Huang Xiaolin. Effect of exogenous GA_(3) on “inter-grain apical dominance” and endogenous IAA in grain filling stage of hybrid rice. Acta Physiol Sin 2000; 52 (3): (in Chinese with English abstract).