A fundamental developmental transition in Physcomitrium patens is regulated by evolutionarily conserved mechanisms
A fundamental developmental transition in Physcomitrium patens is regulated by evolutionarily conserved mechanisms
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DOI：
10.1111/ede.12376
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发表时间：
2021-04
影响因子：
2.9
通讯作者：
R. Jaeger;Laura A. Moody
中科院分区：
文献类型：
--
作者：
R. Jaeger;Laura A. Moody
历史上最具决定性的时刻之一是大约4.7亿年前植物对土地的殖民化。从水到陆地的过渡伴随着植物体计划的重大变化，从那些比类似于轮藻的丝状代表，陆地植物的姐妹群，到那些形态复杂，能够殖民更严酷的栖息地。苔藓立碗藓（Physcomitrium patens），也称为立碗藓（Physcomitrella patens），是最早的陆生植物支系--立碗藓的现存代表。展叶拟青霉的原丝体从来自绿丝体原始细胞的孢子中出现，其可以分裂以自我更新以产生绿丝体细胞的细丝。绿线起始细胞可以分化成茎线起始细胞，茎线起始细胞可以分裂和自我更新以产生茎线细胞细丝，茎线细胞细丝广泛地分支并产生三维芽。绿线起始细胞分化为茎线起始细胞的过程受到生长素诱导的肌动蛋白细胞骨架重塑的严格调控。研究表明，支持这种转变的遗传机制也调节不同植物类群的顶端生长和分化。本文综述了已知的细胞和分子机制支持的绿丝体到茎丝体的转变，在P. patens。
One of the most defining moments in history was the colonization of land by plants approximately 470 million years ago. The transition from water to land was accompanied by significant changes in the plant body plan, from those than resembled filamentous representatives of the charophytes, the sister group to land plants, to those that were morphologically complex and capable of colonizing harsher habitats. The moss Physcomitrium patens (also known as Physcomitrella patens) is an extant representative of the bryophytes, the earliest land plant lineage. The protonema of P. patens emerges from spores from a chloronemal initial cell, which can divide to self‐renew to produce filaments of chloronemal cells. A chloronemal initial cell can differentiate into a caulonemal initial cell, which can divide and self‐renew to produce filaments of caulonemal cells, which branch extensively and give rise to three‐dimensional shoots. The process by which a chloronemal initial cell differentiates into a caulonemal initial cell is tightly regulated by auxin‐induced remodeling of the actin cytoskeleton. Studies have revealed that the genetic mechanisms underpinning this transition also regulate tip growth and differentiation in diverse plant taxa. This review summarizes the known cellular and molecular mechanisms underpinning the chloronema to caulonema transition in P. patens.