Corbesier Laurent, Vincent Coral, Jang Seonghoe, Fornara Fabio, Fan Qingzhi, Searle Iain, Giakountis Antonis, Farrona Sara, Gissot Lionel, Turnbull Colin, Coupland George
Max Planck Institute for Plant Breeding Research, Carl von Linne Weg 10, D-50829 Cologne, Germany.
Science. 2007 May 18;316(5827):1030-3. doi: 10.1126/science.1141752. Epub 2007 Apr 19.
In plants, seasonal changes in day length are perceived in leaves, which initiate long-distance signaling that induces flowering at the shoot apex. The identity of the long-distance signal has yet to be determined. In Arabidopsis, activation of FLOWERING LOCUS T (FT) transcription in leaf vascular tissue (phloem) induces flowering. We found that FT messenger RNA is required only transiently in the leaf. In addition, FT fusion proteins expressed specifically in phloem cells move to the apex and move long distances between grafted plants. Finally, we provide evidence that FT does not activate an intermediate messenger in leaves. We conclude that FT protein acts as a long-distance signal that induces Arabidopsis flowering.
在植物中，叶片能够感知日照长度的季节性变化，从而启动长距离信号传导，诱导茎尖开花。长距离信号的身份尚未确定。在拟南芥中，叶片维管组织（韧皮部）中开花位点T（FT）转录的激活会诱导开花。我们发现，FT信使核糖核酸在叶片中仅短暂需要。此外，在韧皮部细胞中特异性表达的FT融合蛋白会移动到顶端，并在嫁接植物之间远距离移动。最后，我们提供证据表明，FT不会在叶片中激活中间信使。我们得出结论，FT蛋白作为一种长距离信号诱导拟南芥开花。
