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Abscisic acid controlled sex before transpiration in vascular plants


McAdam, SAM and Brodribb, TJ and Banks, JA and Hedrich, R and Atallah, NM and Cai, C and Geringer, MA and Lind, C and Nichols, DS and Stachowski, K and Geiger, D and Sussmilch, FA, Abscisic acid controlled sex before transpiration in vascular plants, Proceedings of the National Academy of Sciences, 113, (45) pp. 12862-12867. ISSN 0027-8424 (2016) [Refereed Article]

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Copyright Statement

Copyright 2016 PNAS

DOI: doi:10.1073/pnas.1606614113


Sexual reproduction in animals and plants shares common elements, including sperm and egg production, but unlike animals, little is known about the regulatory pathways that determine the sex of plants. Here we use mutants and gene silencing in a fern species to identify a core regulatory mechanism in plant sexual differentiation. A key player in fern sex differentiation is the phytohormone abscisic acid (ABA), which regulates the sex ratio of male to hermaphrodite tissues during the reproductive cycle. Our analysis shows that in the fern Ceratopteris richardii, a gene homologous to core ABA transduction genes in flowering plants [SNF1-related kinase2s (SnRK2s)] is primarily responsible for the hormonal control of sex determination. Furthermore, we provide evidence that this ABA–SnRK2 signaling pathway has transitioned from determining the sex of ferns to controlling seed dormancy in the earliest seed plants before being co-opted to control transpiration and CO2 exchange in derived seed plants. By tracing the evolutionary history of this ABA signaling pathway from plant reproduction through to its role in the global regulation of plant–atmosphere gas exchange during the last 450 million years, we highlight the extraordinary effect of the ABA–SnRK2 signaling pathway in plant evolution and vegetation function.

Item Details

Item Type:Refereed Article
Keywords:OST1, fern, stomata, evolution, sex determination
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:McAdam, SAM (Dr Scott McAdam)
UTAS Author:Brodribb, TJ (Professor Tim Brodribb)
UTAS Author:Nichols, DS (Dr David Nichols)
UTAS Author:Sussmilch, FA (Dr Frances Sussmilch)
ID Code:112461
Year Published:2016
Funding Support:Australian Research Council (DP140100666)
Web of Science® Times Cited:64
Deposited By:Plant Science
Deposited On:2016-11-11
Last Modified:2017-11-01

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