Abstract
Gibberellins are ent-kaurene derived phytohormones that are involved in seed germination, stem elongation, and flower induction in seed plants, as well as in antheridia formation and spore germination in ferns. Although ubiquitous in vascular plants, the occurrence and potential function(s) of gibberellins in bryophytes have not yet been resolved. To determine the potential role of gibberellin and/or gibberellin-like compounds in mosses, the effect of AMO-1618 on spores of Physcomitrella patens (Hedw.) B.S.G. was tested. AMO-1618, which inhibited ent-kaurene and gibberellin biosynthesis in angiosperms, also inhibited the bifunctional copalyl diphosphate synthase (E.C. 5.5.1.13)/ent-kaurene synthase (E.C. 4.2.3.19) of P. patens. AMO-1618 also caused a decrease in spore germination rates of P. patens, and this inhibitory effect was less pronounced in the presence of ent-kaurene. These results suggest that ent-kaurene biosynthesis is required by P. patens spores to germinate, implying the presence of gibberellin-like phytohormones in mosses.
Abbreviations
- AMO-1618:
-
2′Isopropyl-4′-(trimethylammonium chloride)-5′-methylphenyl piperidine-1-carboxylate
- GA:
-
Gibberellin
- GGPP:
-
Geranylgeranyl diphosphate
- LB:
-
Luria-Bertani
- IPTG:
-
Isopropyl β-d-1-thiogalactopyranoside
- DTT:
-
Dithiothreitol
- GC–MS:
-
Gas chromatography–mass spectrometry
- m/z:
-
Mass to charge ratio
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Acknowledgments
This work is funded by Southern Illinois University through a SEED grant to A.A. and a REACH award to E.S. We thank Dr. Robert Coates (University of Illinois) for the ent-kaurene and 16α-hydroxykaurane standards, and Dr. Dale Vitt (Southern Illinois University) and Dr. Pierre-Francois Perroud (Washington University in St Louis) for the Physcomitrella patens used in this study. Support was provided by NSF (to K.R.) through the Assembling the Tree of Life Program.
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Anterola, A., Shanle, E., Mansouri, K. et al. Gibberellin precursor is involved in spore germination in the moss Physcomitrella patens . Planta 229, 1003–1007 (2009). https://doi.org/10.1007/s00425-008-0875-1
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DOI: https://doi.org/10.1007/s00425-008-0875-1