Department of Botany, Plant Science Laboratories, University of Reading, Whiteknights, RG6 2AS, Reading, U.K..
Planta. 1979 Oct;146(5):545-50. doi: 10.1007/BF00388830.
The effect of blue light on hypocotyl extension in de-etiolated seedlings of lettuce, cucumber and tomato was investigated under conditions which precluded the involvement of phytochrome. Small but highly inhibitory amounts of blue light were added to a high intensity background illumination from low pressure sodium lamps. A log-linear response for inhibition of hypocotyl extension against the blue light fluence rate was obtained for lettuce and cucumber, and inhibition in tomato was also related to the blue light fluence rate. The added blue light did not alter phytochrome photostationary state and its effect was independent of the total fluence rate. Growth inhibition by Pfr could be demonstrated in tomato and cucumber but not in lettuce. The results indicate that two photoreceptors may normally be involved in the control of seedling growth but their relative importance varies greatly between species.
在排除了光敏色素参与的情况下，研究了蓝光对生菜、黄瓜和番茄去黄化幼苗下下胚轴延伸的影响。在低压钠灯的高强度背景光照下，加入少量但高度抑制性的蓝光。对于生菜和黄瓜，抑制下胚轴延伸与蓝光辐照度呈对数线性关系，而番茄的抑制也与蓝光辐照度有关。加入的蓝光不会改变光敏色素光稳定状态，其作用与总辐照度无关。在番茄和黄瓜中可以证明 Pfr 的生长抑制作用，但在生菜中则不行。结果表明，两种光受体通常参与幼苗生长的控制，但它们在不同物种中的相对重要性差异很大。
