Morphological development of rice caryopses located at the different positions in a panicle from early to middle stage of grain filling
Morphological development of rice caryopses located at the different positions in a panicle from early to middle stage of grain filling
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DOI：
10.1071/fp03122
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发表时间：
2003-01-01
影响因子：
3
通讯作者：
Yamagishi, T
中科院分区：
文献类型：
--
作者：
Ishimaru, T;Matsuda, T;Yamagishi, T
水稻颖果表现出不同的灌浆模式，这取决于在穗内的位置。位于上部一级轴分枝上的颖果在成熟时通常比位于下部一级轴的二级轴分枝上的颖果积累更多的淀粉。本研究将前、后两种类型的颖果分别定义为上级和低级颖果。上级颖果在开花后不久伸长，而下级颖果几乎不伸长，直到开花后的前4 d才开始形态停滞（图1）。然而，一旦下位颖果开始伸长，它们的形态发育与上级颖果相同，直到灌浆中期。内珠被细胞分裂在胚乳细胞化前停止，果皮在胚乳积累淀粉前充当暂时的淀粉贮存组织，胚乳细胞数随着珠心解体而确定。这些结果表明，胚乳与母体组织的发育是协调的。此外，内珠被细胞数和胚乳细胞数的差异与上级和下级颖果胚乳大小的差异有关。
Rice caryopses show different patterns of grain filling depending on position within a panicle. Caryopses located on the upper primary rachis branches generally accumulate larger amounts of starch at maturity than caryopses located on the secondary rachis branches of the lower primary rachis. In this study, the former and latter types of caryopses were defined as superior and inferior caryopses, respectively. Superior caryopses elongated soon after flowering, whereas inferior caryopses hardly elongated and were morphologically stagnant until the first 4 d after flowering (DAF). However, once inferior caryopses began elongation, their morphological development was the same as superior caryopses until the middle stage of grain filling. Cell division of the inner integument ceased before endosperm cellularization, pericarp functioned as a transient starch storage tissue until endosperm accumulated starch, and endosperm cell number was determined concomitantly with nucellus disintegration. These results implied the coordinated development of the endosperm with maternal tissues. In addition, differences of inner-integument cell number and endosperm cell number were related to a difference of endosperm size between superior and inferior caryopses.