At tillering stage, spraying GA solution to the dwarf mutant could promote the elongation of the first and the second internode, but no significant effect on the length of the third internode.

喷洒法的结果也表明，在分蘖期，外源GA主要是促进基部第一、第二节间伸长，而第三节间及叶片则无显著增长。

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The variation extent of internode length is the Maximum in population, while that of spikelet number is the minimum.

种群内变异幅度最大和最小的分别为节间长和小穗数。

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But after the abortion, the development of ZS97A pollen was impaired and the elongation rate decreased, leading to panicle enclosure by shortening the uppermost internode (UI) length.

而伴随着花粉发育受阻至花粉败育之后，ZS97A的节间伸长速率下降，最终导致倒一节间缩短而引起包穗。

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