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梯度减库对粳稻内源激素含量及粒质量形成的影响

DOI: 10.3969/j.issn.1000-7091.2013.03.025, PP. 139-144

Keywords: 粳稻,内源激素,源库关系,粒位,粒质量

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Abstract:

为明确籽粒内激素含量变化动态与源库矛盾的关系,通过梯度减除稻穗上部枝梗的方法,改变不同穗位籽粒的源库关系,进而研究了不同粒位籽粒的IAA、ABA、ZT、GA3的动态变化及其与胚乳细胞增殖、粒质量形成之间的关系。结果表明,籽粒中激素以IAA、ABA含量较大,而ZT、GA3含量较小;自然状态下,粒位间IAA含量总的变化趋势是灌浆前期下位籽粒大于上位籽粒,灌浆后期则相反;其他激素总体表现为灌浆前期上位籽粒大于下位籽粒,灌浆后期则相反;粒位间激素含量差异存在波动。源库比例改变后,各粒位激素含量总体提高、弱势粒的变化幅度较大,粒位间、激素间存在不同的变化特征;相同粒位激素含量变化幅度并不随减库程度的增加而增加。灌浆中期的激素含量对胚乳细胞增殖有延后效应,灌浆前期及后期的激素含量对籽粒干质量增加既存在即时效应,又存在延后效应。

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