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首页> 外文期刊>Journal of Experimental Botany >The nature of floral signals in Arabidopsis. II. Roles for FLOWERING LOCUS T (FT) and gibberellin.
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The nature of floral signals in Arabidopsis. II. Roles for FLOWERING LOCUS T (FT) and gibberellin.

机译：拟南芥中花信号的性质。二。 FLOWERING LOCUS T（FT）和赤霉素的作用。

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Signals produced in leaves are transported to the shoot apex where they cause flowering. Protein of the gene FLOWERING LOCUS T (FT) is probably a long day (LD) signal in ARABIDOPSIS: In the companion paper, rapid LD increases in FT expression associated with flowering driven photosynthetically in red light were documented. In a far red (FR)-rich LD, along with FT there was a potential role for gibberellin (GA). Here, with the GA biosynthesis dwarf mutant ga1-3, GA-treated plants flowered after 26 d in short days (SD) but untreated plants were still vegetative after 6 months. Not only was FT expression low in SD but applied GA bypassed some of the block to flowering in ft-1. On transfer to LD, ga1-3 only flowered when treated simultaneously with GA, and FT expression increased rapidly (<19.5 h) and dramatically (15-fold). In contrast, in the wild type in LD there was little requirement for GA for FT increase and flowering so its endogenous GA content was near to saturating. Despite this permissive role for endogenous GA in Columbia, RNA interference (RNAi) silencing of the GA biosynthesis gene, GA 20-OXIDASE2, revealed an additional, direct role for GA in LD. Flowering took twice as long after silencing the LD-regulated gene, GA 20-OXIDASE2. Such independent LD input by FT and GA reflects their non-sympatric expression (FT in the leaf blade and GA 20-OXIDASE2 in the petiole). Overall, FT acts as the main LD floral signal in Columbia and GA acts on flowering both via and independently of FT.
机译：叶片中产生的信号被传送到茎尖，引起开花。 FLOWERING LOCUS T（FT）基因的蛋白可能在阿拉伯植物中是一个漫长的一天（LD）信号：在伴侣论文中，记录了LD表达快速LD增加，其与在红光下光合作用的光合作用相关。在富含红色（FR）的LD和FT中，赤霉素（GA）具有潜在的作用。在此，使用GA生物合成矮化突变体ga1-3，经GA处理的植物在短日（SD）的第26天后开花，但未经处理的植物在6个月后仍处于营养状态。不仅在SD中FT表达低，而且应用GA绕过了ft-1中开花的某些障碍。转移至LD时，ga1-3仅在与GA同时处理时才开花，而FT表达迅速增加（<19.5 h）并且急剧增加（15倍）。相反，在LD的野生型中，FT增加和开花对GA的需求很小，因此其内源GA含量接近饱和。尽管在哥伦比亚内源性GA具有这种允许的作用，但GA生物合成基因GA 20-OXIDASE2的RNA干扰（RNAi）沉默显示了GA在LD中的直接作用。使LD调控基因GA 20-OXIDASE2沉默后，开花时间延长了两倍。 FT和GA的这种独立LD输入反映了它们的非同系表达（叶片中的FT和叶柄中的GA 20-OXIDASE2）。总体而言，FT是哥伦比亚的主要LD花卉信号，而GA则通过FT且独立于FT来开花。

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