Plant Physiol. Drug Metab Dispos
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Plant Physiology 67:358-362 (1981)
© 1981 American Society of Plant Biologists

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Articles

Studies in Wild Oat Seed Dormancy

I. THE ROLE OF ETHYLENE IN DORMANCY BREAKAGE AND GERMINATION OF WILD OAT SEEDS (AVENA FATUA L.)

Stephen W. Adkins1 and James D. Ross

Department of Botany, University of Reading, Whiteknights, Reading, RG2 6AS, United Kingdom

Seed of Avena fatua were shown to exhibit a characteristic loss of dormancy during dry storage at 25 C, whereas similar seed stored at 5 C maintained dormancy. 2-Chloroethylphosphonic acid was shown to increase germination of partly dormant seed imbibed under certain temperature regimes; a similar effect could not be established for fully dormant or fully nondormant seed. Using gas-liquid chromatography, natural ethylene levels were followed during imbibition of fully dormant and nondormant seed. A large peak in production was observed in the period prior to radicle emergence in the case of the nondormant seed. Measurements of ethylene production taken at 15 C, following periods of after-ripening in moist soil at either 5 or 25 C, indicated that endogenous production was unlikely to be a main cause of dormancy breakage in this species. The possibility that endogenous ethylene could play a role in natural dormancy breakage in aged seeds is discussed. The practical possibilities of 2-chloroethylphosphonic acid as a dormancy breaking agent in a field situation are outlined.

1 This work was supported by a Science Research Council-Cooperative Awards in Science and Engineering studentship (to S. W. A.) in cooperation with the Weed Research Organization, Oxford, United Kingdom.




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A. Gianinetti, L. J. J. Laarhoven, S. T. Persijn, F. J. M. Harren, and L. Petruzzelli
Ethylene Production is Associated with Germination but not Seed Dormancy in Red Rice
Ann. Bot., April 1, 2007; 99(4): 735 - 745.
[Abstract] [Full Text] [PDF]


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Copyright © 1981 by the American Society of Plant Biologists