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Current Biology:小立碗藓中2D到3D生长转变的调控因子

已有 656 次阅读 2020-11-27 09:01 |个人分类:每日摘要|系统分类:论文交流

NO GAMETOPHORES 2 Is a Novel Regulator of the 2D to 3D Growth Transition in the Moss Physcomitrella patens

第一作者Laura A. Moody

第一单位牛津大学

通讯作者Laura A. Moody


 Abstract 


大背景The colonization of land by plants was one of the most transformative events in the history of life on Earth.The transition from water, which coincided with and was likely facilitated by the evolution of three-dimensional (3D) growth, enabled the generation of morphological diversity on land.


小背景In many plants, the transition from two-dimensional (2D) to 3D growth occurs during embryo development.


研究材料:However, in the early divergent moss Physcomitrella patens3D growth is preceded by an extended filamentous phase that can be maintained indefinitely.


主要发现:Here, we describe the identification of the cytokinin-responsive NO GAMETOPHORES 2 (PpNOG2) gene, which encodes a shikimate o-hydroxycinnamoyltransferase.


结果1-突变体:In mutants lacking PpNOG2 function, transcript levels of CLAVATA and SCARECROWgenes are significantly reduced, excessive gametophore initial cells are produced, and buds undergo premature developmental arrest. Mutants also exhibit misregulation of auxin-responsive genes.


结果2-PpNOG2功能:Our results suggest that PpNOG2 functions in the ascorbic acid pathway leading to cuticle formation and that NOG2-related genes were co-opted into the lignin biosynthesis pathway after the divergence of bryophytes and vascular plants.


结果3-3D生长模型:We present a revised model of 3D growth in which PpNOG2 comprises part of a feedback mechanism that is required for the modulation of gametophore initial cell frequency.


结论:We also propose that the 2D to 3D growth transition in P. patens is underpinned by complex auxin-cytokinin crosstalk that is regulated, at least in part, by changes in flavonoid metabolism.


 摘  要 


植物登陆并殖民陆地是地球生命史上最为变革性的事件之一。在此过程中,植物从水生逐渐到陆生,伴随着三维生长的演化,并且3D生长很有可能促进了植物从水生到陆生的转变,使得植物在陆地上的形态多种多样。在许多植物中,2D到3D生长的转变发生于胚胎发育时期。但是,在早期分化的苔藓植物小立碗藓中,3D生长之前存在一个可以无限维持的丝状体时期。本文中,作者鉴定到了一个编码莽草酸o-邻羟基肉桂酰转移酶的细胞分裂素响应基因PpNOG2。在nog2突变体中,CLVSCR基因的表达都被显著降低,并产生过多的配子体起始细胞,而芽会经历提前发育停滞。突变体同时还存在生长素响应基因的紊乱调控。本文的研究结果显示PpNOG2作用于抗坏血酸通路,影响角质层的形成,并且在苔藓植物和维管植物分化后,NOG2相关的基因被整合到木质素生物合成的通路上。作者进一步构建了一个3D生长模型,其中PpNOG2是一个反馈机制的部分组成,作用于配子体起始细胞频率的调节。作者还提出小立碗藓中2D到3D的生长转变是由复杂的生长素-细胞分裂交互作用所调控的,并且部分通过类黄酮代谢来调节。



 通讯作者 

**Laura A. Moody**


个人简介:

2000-2003年,英国杜伦大学,学士;

2006-2007年,英国格拉斯哥大学,硕士;

2007-2011年,英国伯明翰大学,博士;

2011-2018年,英国牛津大学,博后。


研究方向:2D到3D生长转变的遗传调控机制。


doi: 10.1016/j.cub.2020.10.077


Journal: Current Biology

Published date: Nov 25, 2020



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