The sexual lability hypothesis for the origin of the land plant generation cycle

Renner, Susanne S.; Sokoloff, Dmitry D.

doi:10.1016/j.cub.2024.05.029

Current Biology

2024

DOI: 10.1016/j.cub.2024.05.029

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The sexual lability hypothesis for the origin of the land plant generation cycle

Susanne S. Renner,

Dmitry D. Sokoloff

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2024

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Cited by 3 publications

References 92 publications

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Plant biology: Mapping meristem morphogenesis in Marchantia

Duckett

2024

Current Biology

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Plant biology: Mapping meristem morphogenesis in Marchantia

Duckett

2024

Current Biology

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A stomate by any other name? The open question of hornwort gametophytic pores, their homology, and implications for the evolution of stomates

Fortin,

Friedman

2024

New Phytologist

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SummaryAdvances in bryophyte genomics and the phylogenetic recovery of hornworts, mosses, and liverworts as a clade have spurred considerable recent interest in character evolution among early embryophytes. Discussion of stomatal evolution, however, has been incomplete; the result of the neglect of certain potential stomate homologues, namely the two‐celled epidermal gametophytic pores of hornworts (typically referred to as ‘mucilage clefts’). Confusion over the potential homology of these structures is the consequence of a relatively recent consensus that hornwort gametophytic pores (‘HGPs’ – our term) are not homologous to stomates. We explore the occurrence and diverse functions of stomates throughout the evolutionary history and diversity of extinct and extant embryophytes. We then address arguments for and against homology between known sporophyte‐ and gametophyte‐borne stomates and HGPs and conclude that there is little to no evidence that contradicts the hypothesis of homology. We propose that ‘intergenerational heterotopy’ might well account for the novel expression of stomates in gametophytes of hornworts, if stomates first evolved in the sporophyte generation of embryophytes. We then explore phylogenetically based hypotheses for the evolution of stomates in both the gametophyte and sporophyte generations of early lineages of embryophytes.

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Assembling the picture of stomatal evolution

Clark

2024

New Phytologist

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What was the nature of the earliest land plant? From that ancestor, how have we arrived at the diversity of plants we see today? These remain two of the largest questions in plant evolutionary biology, relating not just to the evolution of plants themselves but also to the formation of the terrestrial biosphere. The origin of plants from an algal ancestor involved a suite of innovations that facilitated the process of terrestrialisation and characterised most plants today (Donoghue et al., 2021). Two of these innovationsstomata and the alternation of generationsare directly and indirectly the focus of a new paper by Fortin & Friedman (2024; 40-48), published in this issue of New Phytologist.

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The sexual lability hypothesis for the origin of the land plant generation cycle

Cited by 3 publications

References 92 publications

Plant biology: Mapping meristem morphogenesis in Marchantia

Plant biology: Mapping meristem morphogenesis in Marchantia

A stomate by any other name? The open question of hornwort gametophytic pores, their homology, and implications for the evolution of stomates

Assembling the picture of stomatal evolution

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