Hormonal and genetic control of pluripotency in bryophyte model systems

Flores-Sandoval, Eduardo; Nishihama, Ryuichi; Bowman, John L.

doi:10.1016/j.pbi.2023.102486

Current Opinion in Plant Biology

2024

DOI: 10.1016/j.pbi.2023.102486

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Hormonal and genetic control of pluripotency in bryophyte model systems

Eduardo Flores-Sandoval,

Ryuichi Nishihama,

John L. Bowman

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2024

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Cited by 5 publications

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Plasmodesmata dynamics in bryophyte model organisms: secondary formation and developmental modifications of structure and function

Wegner,

Ehlers

2024

Planta

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Main conclusion Developing bryophytes differentially modify their plasmodesmata structure and function. Secondary plasmodesmata formation via twinning appears to be an ancestral trait. Plasmodesmata networks in hornwort sporophyte meristems resemble those of angiosperms. Abstract All land-plant taxa use plasmodesmata (PD) cell connections for symplasmic communication. In angiosperm development, PD networks undergo an extensive remodeling by structural and functional PD modifications, and by postcytokinetic formation of additional secondary PD (secPD). Since comparable information on PD dynamics is scarce for the embryophyte sister groups, we investigated maturating tissues of Anthoceros agrestis (hornwort), Physcomitrium patens (moss), and Marchantia polymorpha (liverwort). As in angiosperms, quantitative electron microscopy revealed secPD formation via twinning in gametophytes of all model bryophytes, which gives rise to laterally adjacent PD pairs or to complex branched PD. This finding suggests that PD twinning is an ancient evolutionary mechanism to adjust PD numbers during wall expansion. Moreover, all bryophyte gametophytes modify their existing PD via taxon-specific strategies resembling those of angiosperms. Development of type II-like PD morphotypes with enlarged diameters or formation of pit pairs might be required to maintain PD transport rates during wall thickening. Similar to angiosperm leaves, fluorescence redistribution after photobleaching revealed a considerable reduction of the PD permeability in maturating P. patens phyllids. In contrast to previous reports on monoplex meristems of bryophyte gametophytes with single initials, we observed targeted secPD formation in the multi-initial basal meristems of A. agrestis sporophytes. Their PD networks share typical features of multi-initial angiosperm meristems, which may hint at a putative homologous origin. We also discuss that monoplex and multi-initial meristems may require distinct types of PD networks, with or without secPD formation, to control maintenance of initial identity and positional signaling.

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Plasmodesmata dynamics in bryophyte model organisms: secondary formation and developmental modifications of structure and function

Wegner,

Ehlers

2024

Planta

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Evolution of the sporophyte shoot axis and functions of TALE HD transcription factors in stem development

Tsuda

2024

Current Opinion in Plant Biology

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Crosstalk between Rho of Plants GTPase signalling and plant hormones

Tian,

Lyu,

2024

Journal of Experimental Botany

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Rho of Plants (ROPs) constitute a plant-specific subset of small guanine nucleotide-binding proteins within the Cdc42/Rho/Rac family. These versatile proteins regulate diverse cellular processes, including cell growth, cell division, cell morphogenesis, organ development, and stress responses. In recent years, the dynamic cellular and subcellular behaviors orchestrated by ROPs have unveiled a notable connection to hormone-mediated organ development and physiological responses, thereby expanding our knowledge of the functions and regulatory mechanisms of this signaling pathway. This article delineates advancements in understanding the interplay between plant hormones and the ROP signaling cascade, centering primarily on the connections with auxin and abscisic acid pathways, alongside preliminary discoveries in cytokinin, brassinosteroid, and salicylic acid responses. It endeavors to shed light on the intricate, coordinated mechanisms bridging cell-level and tissue-level signals that underlie plant cell behavior, organ development, and physiological processes, and highlight future research prospects and challenges in this rapidly developing field.

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Hormonal and genetic control of pluripotency in bryophyte model systems

Cited by 5 publications

References 83 publications

Plasmodesmata dynamics in bryophyte model organisms: secondary formation and developmental modifications of structure and function

Plasmodesmata dynamics in bryophyte model organisms: secondary formation and developmental modifications of structure and function

Evolution of the sporophyte shoot axis and functions of TALE HD transcription factors in stem development

Crosstalk between Rho of Plants GTPase signalling and plant hormones

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