在周年分期播种条件下对小麦冬性春性不同的各类型品种的穗分化研究表明,小麦对低温的反应属数量性的,低温诱导的是小穗原基而不是茎生长锥的伸长;生长锥下部单棱双向发展区是营养器官与生殖器官原基“过渡区”;主茎叶片数的决定时期因品种的冬性、春性类型及播种后的温度条件而异. Spike differentiation of different types of winter wheat under different sowing dates showed that the responses of wheat to the low temperature were quantitative and the low temperature induced the spikelet primordia rather than the elongation of the stem growing cone. The developmental zone of single-sided and double-sided growth cone is the “transitional zone” of primordia of vegetative organs and reproductive organs. The timing of determining the number of main stem leaves varies with the winter, spring type and the temperature conditions after sowing.