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。
In this study，a gradient reduction sink method was used to control the source /sink ratio to illustrate the relationship between phytohomone levels and source /sink ratio in rice grains． We investigated IAA，ABA，ZT and GA3 levels for the grains from different position of the panicle and studied the relationship of phytohormone dynamic changes with the endosperm cell increasing rates as well as with the grain development． Our results showed that the contents of ABA and IAA were higher，whilst the contents of ZT and GA3 were lower in grains． Before grain filling stage， the IAA content of lower grains was higher than that of upper grains，whilst it was contrary after grain filling stage． For the other phytohormones， the contents of upper grains were higher than that of lower grains，and it was also contrary after grain filling stage． There was fluctuation in the differences among phytohormones of different position grains． After the source /sink ratio was changed， the overall content of phytohormone increased，and the weak sink grains showed a wider changing rang． Different position grains and different phytohormones showed different changing characters． The changing range of phytohormone for the different treat and same position grains did not add to the degree of grain treatment． The phytohormone levels showed delayed effects for the endosperm cell increasing during grain filling stage． Whilst the phytohormone levels showed both delay and instant effects for grain weight increase before and after grain filling stage
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