The decision to germinate is regulated by divergent molecular networks in spores and seeds

Eleanor F. Vesty, Younousse Saidi, Laura A. Moody, Daniel Holloway, Amy Whitbread, Sarah Needs, Anushree Choudhary, Bethany Burns, Daniel Mcleod, Susan J. Bradshaw, Hansol Bae, Brian Christopher King, George W. Bassel, Henrik Toft Simonsen, Juliet C. Coates

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    Abstract

    Dispersal is a key step in land plant life cycles, usually via formation of spores or seeds. Regulation of spore- or seed-germination allows control over the timing of transition from one generation to the next, enabling plant dispersal. A combination of environmental and genetic factors determines when seed germination occurs. Endogenous hormones mediate this decision in response to the environment. Less is known about how spore germination is controlled in earlier-evolving nonseed plants. Here, we present an in-depth analysis of the environmental and hormonal regulation of spore germination in the model bryophyte Physcomitrella patens (Aphanoregma patens). Our data suggest that the environmental signals regulating germination are conserved, but also that downstream hormone integration pathways mediating these responses in seeds were acquired after the evolution of the bryophyte lineage. Moreover, the role of abscisic acid and diterpenes (gibberellins) in germination assumed much greater importance as land plant evolution progressed. We conclude that the endogenous hormone signalling networks mediating germination in response to the environment may have evolved independently in spores and seeds. This paves the way for future research about how the mechanisms of plant dispersal on land evolved.
    Original languageEnglish
    JournalNew Phytologist
    Volume211
    Issue number3
    Pages (from-to)952-966
    Number of pages15
    ISSN0028-646X
    DOIs
    Publication statusPublished - 2016

    Bibliographical note

    © 2016 The Authors. New Phytologist © 2016 New Phytologist Trust.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

    Keywords

    • Abscisic acid (ABA)
    • Ent-kaurenes
    • Ethylene
    • High temperature
    • Light
    • Spore germination
    • Strigolactones
    • Physcomitrella

    Cite this

    Vesty, E. F., Saidi, Y., Moody, L. A., Holloway, D., Whitbread, A., Needs, S., Choudhary, A., Burns, B., Mcleod, D., Bradshaw, S. J., Bae, H., King, B. C., Bassel, G. W., Simonsen, H. T., & Coates, J. C. (2016). The decision to germinate is regulated by divergent molecular networks in spores and seeds. New Phytologist, 211(3), 952-966. https://doi.org/10.1111/nph.14018