当前位置:首页 >> 生命科学 >> 植物与植物生理
Nature:成花素发挥功能的机制

日本研究人员在1日的英国《自然》杂志网络版上发表文章说,他们在世界上首次发现了成花素(一种植物激素)促使植物开花的机制,并且在植物茎的顶端发现了成花素受体。

文章说,利用这一发现,有望让花卉随时开花,还能帮助增加作物产量。

所有植物都会合成成花素,成花素的合成受日照长短和气温变化的影响。日本研究人员于2007年发现成花素是由“Hd3a”基因制造的蛋白质,但是没有发现成花素受体及其促进开花的机制。

奈良尖端科学技术大学院大学与大阪大学组成的研究小组利用水稻进行分析,发现一种称为“14-3-3”的蛋白质发挥了受体的作用。成花素在植物叶片中合成后,会移动到茎的顶端,在细胞内部与“14-3-3”蛋白质结合,然后又附着到另一种蛋白质上形成复合体,这种蛋白质复合体能够使产生花芽的基因功能活跃起来。研究小组还在原子水平上弄清了复合体的立体结构。

研究小组已通过促进成花素的合成,培育出了能够全年开花的秋菊,并且通过改变成花素和受体的结合强度,成功使水稻提早或推迟开花。研究人员认为,除了水稻,西红柿等通过调节花期,也可以增加产量。

 

 

生物探索推荐英文论文摘要:

14-3-3 proteins act as intracellular receptors for rice Hd3a florigen

Abstract:

‘Florigen’ was proposed 75 years ago to be synthesized in the leaf and transported to the shoot apex, where it induces flowering. Only recently have genetic and biochemical studies established that florigen is encoded byFLOWERING LOCUS T (FT), a gene that is universally conserved in higher plants. Nonetheless, the exact function of florigen during floral induction remains poorly understood and receptors for florigen have not been identified. Here we show that the rice FT homologue Hd3a interacts with 14-3-3 proteins in the apical cells of shoots, yielding a complex that translocates to the nucleus and binds to the Oryza sativa (Os)FD1 transcription factor, a rice homologue of Arabidopsis thaliana FD. The resultant ternary ‘florigen activation complex’ (FAC) induces transcription of OsMADS15, a homologue of A. thaliana APETALA1(AP1), which leads to flowering. We have determined the 2.4 Å crystal structure of rice FAC, which provides a mechanistic basis for florigen function in flowering. Our results indicate that 14-3-3 proteins act as intracellular receptors for florigen in shoot apical cells, and offer new approaches to manipulate flowering in various crops and trees.

 


Figure 1: Interactions among Hd3a, GF14 and OsFD1.

Figure 1: Interactions among Hd3a, GF14 and OsFD1.

Figure 2: Structure of the florigen activation complex.

Figure 2: Structure of the florigen activation complex.

Figure 3: The Hd3a–GF14b complex enters the nucleus to interact with OsFD1.

Figure 3: The Hd3a–GF14b complex enters the nucleus to interact with OsFD1.

Figure 4: 14-3-3 interaction is required for OsMADS15 activation by Hd3a and OsFD1.

Figure 4: 14-3-3 interaction is required for OsMADS15 activation by Hd3a and OsFD1.

 

分享按钮
评论:   
验证码:  
  [Ctrl+Enter]
相关文章
摘要
研究人员上首次发现了成花素(一种植物激素)促使植物开花的机制,并且在植物茎的顶端发现了成花素受体。
关键字
成花素
 
 
最新推荐文章


近期热点新闻