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Curr Biol. 2018 Nov 19;28(22):3691-3699.e3. doi: 10.1016/j.cub.2018.10.018. Epub 2018 Nov 8.

An Evolutionarily Conserved Abscisic Acid Signaling Pathway Regulates Dormancy in the Liverwort Marchantia polymorpha.

Author information

1
School of Biological Sciences, Monash University, Melbourne, VIC 3800, Australia; Department of Plant Ecology and Evolution, Evolutionary Biology Centre, Uppsala University, 75236 Uppsala, Sweden.
2
Department of Bioscience, Tokyo University of Agriculture, Tokyo 156-8502, Japan.
3
School of Biological Sciences, Monash University, Melbourne, VIC 3800, Australia.
4
Graduate School of Science, Kobe University, Kobe 657-8501, Japan.
5
Graduate School of Biostudies, Kyoto University, Kyoto 606-8502, Japan.
6
Department of Plant Ecology and Evolution, Evolutionary Biology Centre, Uppsala University, 75236 Uppsala, Sweden.
7
Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden. Electronic address: rishi.bhalerao@slu.se.
8
Department of Bioscience, Tokyo University of Agriculture, Tokyo 156-8502, Japan. Electronic address: sakata@nodai.ac.jp.
9
School of Biological Sciences, Monash University, Melbourne, VIC 3800, Australia. Electronic address: john.bowman@monash.edu.

Abstract

Dormancy is a key process allowing land plants to adapt to changing conditions in the terrestrial habitat, allowing the cessation of growth in response to environmental or physiological cues, entrance into a temporary quiescent state, and subsequent reactivation of growth in more favorable environmental conditions [1-3]. Dormancy may be induced seasonally, sporadically (e.g., in response to drought), or developmentally (e.g., seeds and apical dominance). Asexual propagules, known as gemmae, derived via clonal reproduction in bryophytes, are often dormant until displaced from the parent plant. In the liverwort Marchantia polymorpha, gemmae are produced within specialized receptacles, gemma cups, located on the dorsal side of the vegetative thallus [4]. Mature gemmae are detached from the parent plant but may remain in the cup, with gemma growth suppressed as long as the gemmae remain in the gemma cup and the parental plant is alive [5]. Following dispersal of gemmae from gemma cups by rain, the gemmae germinate in the presence of light and moisture, producing clonal offspring [6]. In land plants, the plant hormone abscisic acid (ABA) regulates many aspects of dormancy and water balance [7]. Here, we demonstrate that ABA plays a central role in the control of gemma dormancy as transgenic M. polymorpha gemmae with reduced sensitivity to ABA fail to establish and/or maintain dormancy. Thus, the common ancestor of land plants used the ABA signaling module to regulate germination of progeny in response to environmental cues, with both gemmae and seeds being derived structures co-opting an ancestral response system.

KEYWORDS:

ABA; ABI1; ABI3; ABSCISIC ACID INSENSITIVE1; ABSCISIC ACID INSENSITIVE3; Marchantia polymorpha; abscisic acid; clonal reproduction; dormancy; gemma

PMID:
30416060
DOI:
10.1016/j.cub.2018.10.018

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