A mechanism for promoting the germination of Zinnia elegans seeds by hydrogen peroxide

H2O2 promotes seed germination of cereal plants such as barley, wheat and rice, and several mechanisms have been proposed for its action [Naredo et al. (1998) Seed Sci. Technol. 26: 675 - 689]. We investigated the role of H2O2 in the germination of Zinnia elegans seeds. H2O2 promoted seed germinatio...

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Bibliographic Details
Published in:Plant and cell physiology 2001-03, Vol.42 (3), p.286-291
Main Authors: Ogawa, K. (Okayama-ken. Research Inst. for Biological Sciences, Kayo (Japan)), Iwabuchi, M
Format: Article
Language:English
Subjects:
2-methyl-6-(p-methoxyphenyl)-3
2-α]pyrazin-3-one
7-dihydroimidazo
Antioxidants - pharmacology
Asteraceae - drug effects
Asteraceae - physiology
Ethanol
GERMINATION
Glutathione reductase
HYDROGEN PEROXIDE
Hydrogen Peroxide - pharmacology
Key words: Development — Dormancy breakage — Germination — Hydrogen peroxide — Redox — Zinnia elegans
MCLA
Oxidants - pharmacology
Phenols
Potassium Cyanide - pharmacology
reactive oxygen species
Reactive Oxygen Species - metabolism
ROS
Salicylamides - pharmacology
salicylhydroxamic acid
SEEDS
Seeds - drug effects
Seeds - growth & development
SHAM
ZINNIA ELEGANS
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Summary:H2O2 promotes seed germination of cereal plants such as barley, wheat and rice, and several mechanisms have been proposed for its action [Naredo et al. (1998) Seed Sci. Technol. 26: 675 - 689]. We investigated the role of H2O2 in the germination of Zinnia elegans seeds. H2O2 promoted seed germination in a dose-dependent manner as did respiratory inhibitors, indicating that H2O2 itself possibly promotes seed germination rather than O2. Seed germination was promoted by removal of pericarp from seeds or by removal of ethanol-soluble compounds from the seeds with pericarp. The ethanol-soluble compounds suppressed the germination of seeds having no pericarp, and this effect was reversed by H2O2. These findings indicate that oxidation of the germination inhibitor(s) present in the pericarp by H2O2 promotes seed germination. Antioxidants which are derivatives of well-known germination inhibitors suppressed seed germination in a dose-dependent manner, suggesting that, to initiate seed germination, a germination inhibitor(s) should be decomposed by an oxidant such as H2O2.
ISSN:0032-0781
1471-9053
DOI:10.1093/pcp/pce032