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Association between pollen fertility and elongation of uppermost internode in TGMS rice

机译：TGMS稻米花粉生育与最高节间伸长的关系

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摘要

Elongation of the uppermost internode (UI) of rice (Oryza sativa L.) is an adaptive characteristic that helps the panicle emerge from the flag-leaf sheath and complete anthesis. The elongated uppermost internode (eui) mutant Changxuan 3S (CX) of TGMS rice, which shows notably rapid elongation in UI during the heading phase and remarkable variation in UI length under different pollen fertility conditions, is a model plant for studying UI elongation. Dynamic elongation of CX plants revealed that detectable elongation growth of the UI in CX plants started 6 days prior to anthesis and ceased after anthesis. This growth was separated into three elongation phases: the exponential phase, linear phase, and slow-growth phase. Pollen fertility significantly influenced UI elongation growth during the linear and slow-growth phases. Temperature and pollen fertility during the pollen developmental phase in CX plants were significantly negatively correlated; moreover, the pollen fertility of the young panicle greatly affected the elongation growth of the UI. The variation in pollen fertility resulted in a significant difference in phytohormone levels in the UI and young panicle during the linear phase. Decapitation of the UI further confirmed that panicle fertility played a central role in UI elongation. We concluded that pollen fertility is mediated by the manipulation of phytohormones and that phytohormone levels are mediated by the manipulation of UI elongation.
机译：大米的最高节间（UI）的伸长（ORYZA Sativa L.）是自适应特性，其有助于穗从旗叶护套和完整的花序中出现。 TGMS米的细长最高的（EUI）突变体突变体突变体突变体突变3S（CX），其在不同花粉生育条件下的标题相位和UI长度的显着变化期间显示出UI的显着伸长，是用于研究UI伸长率的模型工厂。 CX植物的动态伸长率显示CX植物中UI中的可检测伸长率生长在开花前6天开始，在开花后停止。这种生长分为三个伸长级：指数相，线性相和缓慢生长阶段。花粉生育率显着影响线性和缓慢生长阶段的UI伸长率生长。 CX植物中花粉发育期间的温度和花粉生育率显着呈负相关;此外，年轻穗的花粉生育率大大影响了UI的伸长率。花粉生育能力的变异导致UI和幼粒子在线阶段期间植物激素水平的显着差异。 UI的斩首进一步证实了胰岛生育能力在UI伸长率中发挥了核心作用。我们的结论是，花粉育性是由植物激素的操作介导和植物激素水平由UI伸长的操作介导的。

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