Science2014-06-11 1:41 PM

研究发现NAC转录因子与远古时植物在陆地上的适应有关 Contribution of NAC Transcription Factors to Plant Adaptation to Land

论文摘要 

据一项新的研究披露,在地球的早期植物生活完成从水至陆地的过渡之前,这些先驱植物必须要演化出用于传输水的专门细胞--而一组被称作NAC转录因子的特别蛋白可能在该发展中起着一种重要的作用。

Bo Xu及其同事知道,这些转录因子会作用于某些基因而产生陆地维管植物的专门化的往返输送水及支持植物茎秆的细胞。因此,研究人员将常见陆生植物拟南芥的基因组与被称作小立碗藓的苔藓的基因组进行了比较并发现,NAC转录因子在该苔藓中会作用于非常类似的基因以达到非常类似的目的。

他们说,在拟南芥中,这类蛋白负责监督木质组织的发育,而后者是输送水的组织。但是在小立碗藓中,该转录因子调控着螅体和坚实细胞的发育--它们分别是输送水及提供结构支持的专门化细胞。据研究人员披露,这些在基因调控及细胞功能上的相似性表明,NAC转录因子与远古时植物在陆地上的适应有关。


Abstract 

The development of cells specialized for water conduction or support is a striking innovation of plants that has enabled them to colonize land. The NAC transcription factors regulate differentiation of these cells in vascular plants. However, the path by which plants with these cells have evolved from those of their non-vascular ancestors is unclear. We investigated genes of the moss Physcomitrella patens that encode NAC proteins. Loss-of-function mutants formed abnormal water-conducting and supporting cells, as well as malformed sporophyte cells, and overexpression induced ectopic differentiation of water-conducting-like cells. Our results show conservation of transcriptional regulation and cellular function between moss and Arabidopsis thaliana water-conducting cells. The conserved genetic basis suggests roles for NAC proteins in the adaptation of plants to land.

KEYWORDS

SHARE & LIKE

COMMENTS

ABOUT THE AUTHOR

Science

Science Magazine

0 Following 18 Fans 0 Projects 236 Articles

SIMILAR ARTICLES

AbstractThe conservation of sleep across all animal species suggests that sleep serves a vital function. We here report that sleep has a critical funct

Read More

Introduction Recent decades have seen a major international effort to inventory tree communities in the Amazon Basin and Guiana Shield (Amazonia), but

Read More

IntroductionInitiation of protein synthesis is a key step in the control of gene expression. In eukaryotes, initiation is a highly complex process that

Read More

Abstract For decades, social psychological theories have posited that the automatic processes captured by implicit measures have implications for soci

Read More

论文摘要动物界最复杂的眼睛可以在物种口足类甲壳动物(濑尿虾)中找到,其中一些有12种不同类型的光感受器,每种各取样较窄的一组波长,范围包含了深紫外光到远红光(300到720纳米)。在功能上,这种彩色复杂性被视作是谜。当3种或4种色彩通道对色彩辨认来说已经足够时,为何要使用12种色彩通道?对口足类动物行

Read More

论文摘要 首先,在一篇“评论”文章中,Thomas Piketty 和 Emmanuel Saez用“世界顶级收入数据库(WTID)”来比较这两个数值多年来是如何在欧洲和美国演变的;WTID包括了一个世纪之久的有关全球收入的数据以及2个世纪之久的有关个人财富的数据。据研究人员披露,在20世纪之交的时候

Read More

IntroductionCensorship has a long history in China, extending from the efforts of Emperor Qin to burn Confucian texts in the third century BCE to the c

Read More

Many animals, on air, water, or land, navigate in three-dimensional (3D) environments, yet it remains unclear how brain circuits encode the animal's 3D

Read More

Many animals, on air, water, or land, navigate in three-dimensional (3D) environments, yet it remains unclear how brain circuits encode the animal's 3D

Read More

Like mammalian neurons, Caenorhabditis elegans neurons lose axon regeneration ability as they age, but it is not known why. Here, we report that let-7

Read More