Serna Laura, Martin Cathie
Environmental Sciences Faculty, University of Castilla-La Mancha, 45071 Toledo, Spain.
Trends Plant Sci. 2006 Jun;11(6):274-80. doi: 10.1016/j.tplants.2006.04.008. Epub 2006 May 11.
Sometimes, proteins, biological structures or even organisms have similar functions and appearances but have evolved through widely divergent pathways. There is experimental evidence to suggest that different developmental pathways have converged to produce similar outgrowths of the aerial plant epidermis, referred to as trichomes. The emerging picture suggests that trichomes in Arabidopsis thaliana and, perhaps, in cotton develop through a transcriptional regulatory network that differs from those regulating trichome formation in Antirrhinum and Solanaceous species. Several lines of evidence suggest that the duplication of a gene controlling anthocyanin production and subsequent divergence might be the major force driving trichome formation in Arabidopsis, whereas the multicellular trichomes of Antirrhinum and Solanaceous species appear to have a different regulatory origin.
有时，蛋白质、生物结构甚至生物体具有相似的功能和外观，但却是通过大不相同的途径进化而来的。有实验证据表明，不同的发育途径已经趋同，从而产生了气生植物表皮的相似突出物，即毛状体。新出现的情况表明，拟南芥以及可能棉花中的毛状体是通过一个转录调控网络发育形成的，该网络不同于调控金鱼草和茄科植物毛状体形成的网络。有几条证据表明，一个控制花青素产生的基因的复制以及随后的分化可能是推动拟南芥毛状体形成的主要力量，而金鱼草和茄科植物的多细胞毛状体似乎有不同的调控起源。
