Department of Plant Sciences, Texas Agricultural Experiment Station, Texas A&M University, 7843, College Station, TX, USA.
Planta. 1979 Jan;145(3):269-72. doi: 10.1007/BF00454451.
Combinations of far-red light (FR) (4 min) and gibberellic acid (GA3), given at the beginning of a daily 12-h dark period in a growth room, were used to study floral induction in four maturity genotypes of the milo group of sorghum (Sorghum bicolor (L.) Moench). The 12-h dark period without GA3 application or FR induced flowering in only the early genotype; FR hastened initiation in the early genotype, while GA3 hastened floral initiation in the two intermidiate-flowering genotypes. GA3 and FR together had a strong synergistic effect, hastening floral initiation by 30 to more than 80 d in the early and intermediate genotypes. Red light (R) did not hasten flowering; FR preceded by R gave the same effect as FR alone. GA3 promoted stem elongation equally whether floral initiation occurred or not; thus, its effect on stem elongation was independent of floral initiation. The capacity of GA3 to induce flowering in sorghum, a short-day plant, seems to be enhanced by phytochrome being in the PR form at the beginning of the night when GA3 was applied.
远红（FR）光（4 分钟）和赤霉素（GA3）的组合，在生长室中每天 12 小时黑暗期开始时使用，用于研究小米组高粱（Sorghum bicolor（L.）Moench）的四个成熟基因型的花诱导。没有 GA3 应用或 FR 的 12 小时黑暗期仅诱导早期基因型开花; FR 加速了早期基因型的起始，而 GA3 加速了两个中间开花基因型的花起始。GA3 和 FR 一起具有很强的协同作用，使早期和中间基因型的花起始提前 30 到 80 多天。红光（R）不会加速开花; FR 之前的 R 产生与 FR 单独相同的效果。GA3 同样促进茎伸长，无论是否发生花起始; 因此，它对茎伸长的影响独立于花起始。在短日照植物高粱中，GA3 诱导开花的能力似乎在夜间开始时 P 素处于 PR 形式时增强。
