Department of Botany, University of Western Australia, Nedlands.
Planta. 1967 Sep;76(3):242-51. doi: 10.1007/BF00409816.
Application of a small amount of gibberellic acid (GA3) to unvernalized rosettes of a biennial strain of Centaurium minus MOENCH brings about immediate stem elongation under both long days (LD) and short days (SD), but the rate of stem elongation falls after the cessation of treatment. Under LD, but not SD, a second period of rapid and prolonged stem elongation may subsequently take place, associated with flowering. Extended GA3 treatment under SD leads to the formation of a long stem but not to flowering; after the treatment the plants revert to vegetative "aerial rosettes" unless transferred to LD prior to the cessation of stem elongation; after such a transfer, rapid stem elongation and flowering may be initiated. If flower primordia are initiated under LD, stem elongation and formation of flower primordia continue after transfer to SD, though flowers do not develop fully. It is suggested that under LD but not SD applied GA3 may bring about the production of endogenous gibberellin, and that this synthesis of endogenous gibberellin occurs in the flower primordia.
应用少量赤霉素（GA3）于二年生的蔓茎露珠草（Centaurium minus MOENCH）的未春化莲座叶丛，能在长日照（LD）和短日照（SD）下立即引起茎的伸长，但处理停止后，茎的伸长速度会下降。在 LD 下，但不在 SD 下，随后可能会出现第二个快速而持久的茎伸长时期，伴随着开花。在 SD 下延长 GA3 处理会导致长茎的形成，但不会导致开花；处理后，植物会恢复到营养的“气生莲座叶丛”，除非在茎伸长停止前将其转移到 LD；转移后，可能会迅速开始茎的伸长和开花。如果在 LD 下启动花原基，那么转移到 SD 后，茎的伸长和花原基的形成会继续，但花不会完全发育。这表明，在 LD 下而不是在 SD 下应用 GA3 可能会导致内源性赤霉素的产生，并且这种内源性赤霉素的合成发生在花原基中。
