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远红光对温特克斯大麦开花光周期诱导影响的动力学及时间依赖性

来源：花匠小妙招时间：2025-11-10 01:05

远红光对温特克斯大麦开花光周期诱导影响的动力学及时间依赖性

Kinetics and time dependence of the effect of far red light on the photoperiodic induction of flowering in wintex barley.

作者信息

Deitzer G F, Hayes R, Jabben M

机构信息

Smithsonian Institution, Radiation Biology Laboratory, 12441 Parklawn Drive, Rockville, Maryland 20852.

出版信息

Plant Physiol. 1979 Dec;64(6):1015-21. doi: 10.1104/pp.64.6.1015.

Abstract

Flowering in the long day plant Hordeum vulgare L. var. Wintex barley was enhanced by the addition of far red light to the main light portion of the photoperiod. Far red energy was provided to produce quantum flux ratios (660/730 nm) and phytochrome photoequilibria (Pfr/total phytochrome) equivalent to those reported both beneath a leaf canopy and outside a canopy at twilight. The photoperiodic requirement for long days can be completely eliminated by the addition of far red light. However, both the effect of extending the photoperiod without far red and the addition of far red to 12-hour photoperiods were suboptimal. Maximal stimulation was achieved only when far red was added to continuous light. The duration of the period of maximal apex elongation rate, as well as the reduction of the time required for floral initiation, were saturated by three inductive cycles. When far red energy was provided intermittently during 3 days of continuous light, the ability to respond varied in a circadian manner. This enhancement of flowering by far red appears to be mediated by the "high irradiance response" of phytochrome.

摘要

在长日照植物大麦（Hordeum vulgare L. var. Wintex barley）中，在光周期的主要光照部分添加远红光可促进开花。提供远红光能量以产生与叶冠层下和黄昏时冠层外所报道的量子通量比（660/730纳米）和光敏色素光平衡（Pfr/总光敏色素）相当的数值。通过添加远红光可完全消除对长日照的光周期需求。然而，不添加远红光延长光周期的效果以及在12小时光周期中添加远红光的效果都不是最佳的。只有在连续光照中添加远红光才能实现最大刺激。最大顶端伸长率的持续时间以及花芽起始所需时间的缩短在三个诱导周期后达到饱和。当在连续光照的3天中间歇性地提供远红光能量时，响应能力以昼夜节律的方式变化。远红光对开花的这种促进作用似乎是由光敏色素的“高辐照度反应”介导的。