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植物进化:现在在所有陆地植物谱系中都有效存在着 tapetum

Wilson A Taylor¹, Paul K Strother²

¹Department of Biology, University of Wisconsin-Eau Claire, Eau Claire, WI, USA.

Current biology : CB

|February 27, 2024

概括

皮膜对于子发育至关重要,在一些菌中是缺席的. 在Marchantia polymorpha中,囊内细胞表达了一个关键基因,功能性地取代了胞壁形成的 tapetum.

科学领域:

植物生物学植物生物学
发展生物学发展生物学
科植物研究科植物研究

背景情况:

面膜是陆地植物中子发育的重要营养组织.
一些植物,如肝,缺乏明显的表皮.
了解这些物种中子发育的替代机制至关重要.

研究的目的:

为了研究肝病菌Marchantia polymorpha中子壁沉积的机制,这种物种缺乏传统的 tapetum.
为了确定细胞和基因基础的子发展在缺席的 tapetum.

主要方法:

基因表达分析与马尔坎提亚多态菌 (Marchantia polymorpha) 胞体内胞壁相关的基因.
定位研究,以确定这些基因在发育中的胞体 (囊) 中表达的位置.

主要成果:

发现一种对子壁形成至关重要的基因,在肝草囊的细胞中被表达.
因此,这些囊层细胞执行通常由 tapetum 执行的功能.

结论:

马克兰蒂亚多态利用一种替代的细胞策略来确保适当的子发育.
囊层细胞可以在功能上替代 bryophytes 中的 tapetum,突出显示发育可塑性.

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