University of Reading Horticultural Research Laboratories, Shinfield Grange, Shinfield, Berkshire.
Planta. 1967 Dec;75(4):291-308. doi: 10.1007/BF00387353.
The ability of gibberellic acid (GA3) to prevent the light inhibition of stem elongation in peas was examined for several varieties under a wide range of irradiation conditions.A saturating dose of GA3 largely prevented the inhibitory effect of red light on total stem height in "Duke of Albany" (tall), "Alaska" (medium) and "Meteor" (dwarf) although a small, but statistically significant, effect persisted in all varieties after 3 days of light. The growth of the second internode was, however, markedly inhibited by red light even with a saturating dose of GA3. With gibberellin there was no difference between the effects of continuous red light and 15 minutes per day on height but the second internode was much shorter in the former treatment. The number of internodes present was the same in both cases and, therefore, the upper internodes in continuous light were as long or longer than in the 15-minute treatment. The number of internodes was only slightly fewer in darkness than in light so that, with GA3, the effect of red light was transient and only the growth of the lower internodes was inhibited. Without GA3 overall height was less in both red light treatments than in darkness for all three varieties.In blue light, on the other hand, there was no difference depending on whether height or internode length is considered, and even with a saturating dose of GA3 the growth rate remained depressed in continuous blue light. There was, however, some interaction between blue light and GA3.Red/far-red reversal experiments showed that in the varieties "Alska" and "Duke of Albany" the far-red stimulation of elongation persisted in the presence of a saturating dose of GA3 while for the dwarf variety "Meteor" there was a significant interaction between far-red and GA3.At least a quantitative difference was found between tall and dwarf peas in their response to light. Tall varieties showed a much greater effect of a prolonged exposure to blue and a smaller effect of a short exposure to red than dwarf varieties. Increasing the duration of exposure to red increasingly inhibited the growth of tall varieties. The medium variety "Alaska" grew to approximately the same height in continuous red and blue light.
研究了赤霉素（GA3）在多种辐射条件下防止豌豆茎伸长被光抑制的能力。在“Duke of Albany”（高）、“Alaska”（中）和“Meteor”（矮）几种品种中，GA3 的饱和剂量在光照 3 天后仍能显著抑制红光对总茎高的抑制作用，但在所有品种中仍存在较小的、但具有统计学意义的影响。然而，红光对第二个节间的生长有明显的抑制作用，即使施加了 GA3 的饱和剂量也是如此。用赤霉素处理，连续红光和每天 15 分钟红光对高度的影响没有差异，但前一种处理方式下第二个节间更短。两种处理方式下节间的数量相同，因此，连续光照下的上节间与 15 分钟处理方式下的节间一样长或更长。在黑暗中节间的数量略少于光照，因此，在 GA3 存在的情况下，红光的作用是暂时的，只有下部节间的生长受到抑制。没有 GA3 时，所有三个品种在红光处理下的总高度都低于黑暗中。另一方面，在蓝光下，无论考虑高度还是节间长度，都没有差异，即使施加了 GA3 的饱和剂量，连续蓝光下的生长速度仍然受到抑制。然而，蓝光和 GA3 之间存在一些相互作用。红蓝反转实验表明，在“Alska”和“Duke of Albany”两个品种中，在 GA3 的饱和剂量存在的情况下，远红光对伸长的刺激仍然存在，而对于矮化品种“Meteor”，远红光和 GA3 之间存在显著的相互作用。在对光的反应方面，高品种和矮品种之间至少存在定量差异。高品种在长时间暴露于蓝光和短时间暴露于红光下的反应要大得多，而矮品种则小得多。增加红光暴露时间会越来越抑制高品种的生长。中品种“Alaska”在连续的红光和蓝光下生长到大致相同的高度。
