光周期现象：在光照周期期间的黑暗对关键夜晚长度的影响。
Photoperiodism: An Effect of Darkness during the Light Period on Critical Night Length.
出版信息
Science. 1963 Jun 28;140(3574):1397-8. doi: 10.1126/science.140.3574.1397.
Abstract
The critical night length of the short-day plant Lemna perpusilla, grown with sucrose, increases roughly 3 hours under cycles with "light periods" composed of darkness preceded and ended by brief exposures to light. Although plants so grown are white, the effect is due neither to the absence of photosynthesis nor to insufficient total energy. It is inconsistent with current ideas on photoperiodic timing but may be explained by a hypothesis based on reported properties of phytochrome.
摘要
短日植物浮萍在蔗糖条件下生长时，临界夜长大约会延长 3 小时，其光周期由先暗后明的短暂光照组成。虽然这样生长的植物呈白色，但该效应既不是由于光合作用的缺失，也不是由于总能量不足造成的。该效应与光周期计时的现有观点不一致，但可以用基于已知光敏色素特性的假说进行解释。
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