Studies on the light controlling the time of flower-opening in Pharbitis nil
Studies on the light controlling the time of flower-opening in Pharbitis nil
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光控制牵牛花开放时间的研究
DOI：
10.1093/oxfordjournals.pcp.a075985
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发表时间：
1980
影响因子：
4.9
通讯作者：
A. Takimoto
中科院分区：
文献类型：
--
作者：
S. Kaihara;A. Takimoto
Pharbitis nil（紫罗兰）的花蕾，在 24°C 黑暗开始后约 10 小时开放。在这个黑暗期的前4小时内给予0.3-3W/m2的日光荧光可以延迟开花时间，但稍后给予的效果很小或没有效果。红光对于延迟开花时间最有效，每 30 分钟给予 5 分钟的红光脉冲也有效。这种 5 分钟红光的效果被随后的远红光脉冲部分逆转，这表明在黑暗中的前 4 小时内缺乏 Pfr 对于正常的花开放时间是必要的。在黑暗开始 10 小时后给予 5 分钟的红光，提前了控制花开放时间的昼夜节律阶段；第二天花蕾提前约7小时开放。随后暴露于远红光下，红光的这种效应也被逆转，这表明光敏色素参与了这一反应。
Flower buds ofPharbitis nil, strain Violet, open about 10 hr after the onset of darkness at 24°C. Daylight fluorescent light at 0.3–3 W/m2given during the first 4 hr of this dark period delayed the time of flower-opening, but that given later had only a slight effect or was ineffective. Red light was most effective in delaying the time of flower-opening, and a 5-min red light pulse given every 30 min also was effective. The effect of this 5-min red light was partly reversed by a subsequent far-red light pulse which suggests that the absence of Pfrduring the first 4 hr in the dark is necessary for normal timing of flower-opening.Five minutes of red light given 10 hr after the onset of darkness advanced the phase of the circadian rhythm which controls the time of flower-opening; buds opened about 7 hr earlier on the following day. This effect of red light was also reversed by a subsequent exposure to far-red light, which suggests the participation of phytochrome in this reaction.