LEAFY maintains apical stem cell activity during shoot development in the fern Ceratopteris richardii.

Abstract:

:During land plant evolution, determinate spore-bearing axes (retained in extant bryophytes such as mosses) were progressively transformed into indeterminate branching shoots with specialized reproductive axes that form flowers. The LEAFY transcription factor, which is required for the first zygotic cell division in mosses and primarily for floral meristem identity in flowering plants, may have facilitated developmental innovations during these transitions. Mapping the LEAFY evolutionary trajectory has been challenging, however, because there is no functional overlap between mosses and flowering plants, and no functional data from intervening lineages. Here, we report a transgenic analysis in the fern Ceratopteris richardii that reveals a role for LEAFY in maintaining cell divisions in the apical stem cells of both haploid and diploid phases of the lifecycle. These results support an evolutionary trajectory in which an ancestral LEAFY module that promotes cell proliferation was progressively co-opted, adapted and specialized as novel shoot developmental contexts emerged.

journal_name

Elife

journal_title

eLife

authors

Plackett AR,Conway SJ,Hewett Hazelton KD,Rabbinowitsch EH,Langdale JA,Di Stilio VS

doi

10.7554/eLife.39625

subject

Has Abstract

pub_date

2018-10-24 00:00:00

issn

2050-084X

pii

39625

journal_volume

7

pub_type

杂志文章

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