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• W4387208634 abstract "Land plants are a monophyletic group of photosynthetic eukaryotes that diverged from streptophyte algae about 470 million years ago. During both the alternating haploid and diploid stages of the life cycle, land plants form multicellular bodies.1,2,3,4 The haploid multicellular body (gametophyte) produces progenitor cells that give rise to gametes and the reproductive organs.5,6,7,8 In the liverwort Marchantia polymorpha, differentiation of the initial cells of gamete-producing organs (gametangia) from the gametophyte is regulated by MpBONOBO (MpBNB), a member of the basic helix-loop-helix (bHLH) transcription factor subfamily VIIIa. In Arabidopsis thaliana, specification of generative cells in developing male gametophytes (pollen) requires redundant action of BNB1 and BNB2.9 Subfamily XI bHLHs, such as LOTUS JAPONICUS ROOTHAIRLESS LIKE1 (LRL1)/DEFECTIVE REGION OF POLLEN1 (DROP1) and LRL2/DROP2 in A. thaliana and the single LRL/DROP protein MpLRL in M. polymorpha, are the evolutionarily conserved regulators of rooting system development.10 Although the role of LRL1/DROP1 and LRL2/DROP2 in gametogenesis remains unclear, their loss leads to the formation of abnormal pollen devoid of sperm cells.11 Here, we show that BNBs and LRL/DROPs co-localize to gametophytic cell nuclei and form heterodimers. LRL1/DROP1 and LRL2/DROP2 act redundantly to regulate BNB expression for generative cell specification in A. thaliana after asymmetric division of the haploid microspore. MpLRL is required for differentiation of MpBNB-expressing gametangium initial cells in M. polymorpha gametophytes. Our findings suggest that broadly expressed LRL/DROP stabilizes BNB expression, leading to the formation of an evolutionarily conserved bHLH heterodimer, which regulates germ cell differentiation in the haploid gametophyte of land plants." @default.
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• W4387208634 date "2023-09-01" @default.
• W4387208634 modified "2023-10-02" @default.
• W4387208634 title "A bHLH heterodimer regulates germ cell differentiation in land plant gametophytes" @default.
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• W4387208634 doi "https://doi.org/10.1016/j.cub.2023.09.020" @default.
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