期刊
CURRENT BIOLOGY
卷 26, 期 1, 页码 93-99出版社
CELL PRESS
DOI: 10.1016/j.cub.2015.11.042
关键词
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资金
- ERC AdG award [EVO500]
- JSPS Fellowship for Overseas Researchers award [PE12565]
- Grants-in-Aid for Scientific Research [15H04391, 15H01233, 25113009] Funding Source: KAKEN
- Biotechnology and Biological Sciences Research Council [1122265] Funding Source: researchfish
The colonization of the land by plants, sometime before 470 million years ago, was accompanied by the evolution tissue systems [1-3]. Specialized structures with diverse functions from nutrient acquisition to reproduction derived from single cells in the outermost layer (epidermis) were important sources of morphological innovation at this time [2, 4, 5]. In extant plants, these structures may be unicellular extensions, such as root hairs or rhizoids [6-9], or multicellular structures, such as asexual propagules or secretory hairs (papillae) [10-12]. Here, we show that a ROOT-HAIR DEFECTIVE SIX-LIKE (RSL) class I basic helix-loop-helix transcription factor positively regulates the development of the unicellular and multicellular structures that develop from individual cells that expand out of the epidermal plane of the liverwort Marchantia polymorpha; mutants that lack MpRSL1 function do not develop rhizoids, slime papillae, mucilage papillae, or gemmae. Furthermore, we discovered that RSL class I genes are also required for the development of multicellular axillary hairs on the gametophyte of the moss Physcomitrella patens. Because class I RSL proteins also control the development of rhizoids in mosses and root hairs in angiosperms [13, 14], these data demonstrate that the function of RSL class I genes was to control the development of structures derived from single epidermal cells in the common ancestor of the land plants. Class I RSL genes therefore controlled the generation of adaptive morphological diversity as plants colonized the land from the water.
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