| 摘要: |
| 本文根据三年田间试验观察资料,分析了北京地区温度条件与冬小麦各穗分化期之间的持续日数,小穗分化速率及与分化小穗数目的关系。并确定了穗不同分化时期有利于小穗分化的温度指标。研究表明,单棱期至护颖分化期为决定小穗数目的关键时期。在该时期中,日平均气温≤7.5℃的日数愈多,分化期间的持续时间愈长,则小穗数愈多。同时,从小花分化到顶端小穗分化期间的日平均气温≤10.5℃日数愈多,持续时间愈长,也有利于小穗分化。 |
| 关键词: 温度条件 小穗数 北京地区 穗分化期 小穗分化 幼穗分化 持续时间 日平均气温 冬小麦 单棱期 |
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| Abstract: |
| The present paper is based on three years data of field tests.The temperature on the following was studied and analyzed: 1.the duration of different stages of spike differentiation. 2.the rate of spikelet differetiation. 3.the spikelet number. It was also tried to find out the optimum temperature for spikelet differentiation at different stages. It was found that the period between single ridge stage and glume differentiation was the critical time for the determination of the spikelet number.Low temperature... |
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