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较多小穗基因型与正常穗基因型比较，小穗数目的增加是由穗分化时期的增长和速率的增加决定的，其速率的作用大于时期的作用。在较多小穗基因型内，同一组合内不同基因型间小穗数目的差异，主要由穗分化的速率决定。认为较多小穗基因型普遍具有高的分化速率，并随穗分化速率的加快而小穗数逐渐增多。选育高穗分化速率基因型是解决较多小穗晚熟问题和提高育成品种单穗粒重及其生产潜力的重要途径。
Compared with the normal panicle genotypes, more spikelet genotypes were determined by the increase of spike differentiation and the increase of spikelet rate, and the effect of spikelet rate was greater than that of the period. In more spikelet genotypes, the difference in the number of spikelets among different genotypes in the same combination is mainly determined by the rate of spike differentiation. It is considered that more spikelet genotypes generally have higher differentiation rates and spikelets numbers gradually increase with the speed of spike differentiation. Breeding of high spike differentiation genotypes is an important approach to solve more spikelet late maturity problems and to improve the grain weight per plant and the potential for their production.