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Temperature and Water Status of Seed Affect Afterripening in Wild Oat (Avena fatua)

Published online by Cambridge University Press:  12 June 2017

Michael E. Foley
Michael E. Foley*
Affiliation:
Dep. Bot. and Plant Pathol., Purdue Univ., West Lafayette, IN 47907-1155
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Abstract

Dormant wild oat seed require afterripening under warm-dry conditions for conversion to a nondormant state capable of germination. Research was conducted to determine the relationship between temperature and seed moisture levels on afterripening of dormant wild oat line M73 seed, and to evaluate the status of water binding in the dormant seed. Conversion of dormant wild oat seed to a nondormant state at 20 to 40 C occurs primarily in the range of 5 to 20% seed moisture. There is an inverse relationship between temperature and seed moisture content for afterripening as measured by seed germination. As the afterripening temperature increases, the seed moisture content must decrease for maximum afterripening (germination) to occur. Moisture isotherms and derived enthalpy curves indicate three regions of water binding which reflect decreased binding of water to seed components as the moisture content in the dormant seed increases. Maximum afterripening, in the second region of water binding, corresponds to seed moisture contents of 7 to 22%. In this region water is weakly associated with macromolecular surfaces and begins to have solvent properties. Because afterripening occurs mainly in the second region of water binding it is likely that individual enzymatic and nonenzymatic reactions, rather than metabolic processes, mediate the conversion of wild oat seed to the nondormant state.

Keywords

Wild oat, Avena fatua L. # AVEFADormancygerminationseed
Type
Weed Biology and Ecology
Information
Weed Science , Volume 42 , Issue 2 , June 1994 , pp. 200 - 204
Copyright
Copyright © 1994 by the Weed Science Society of America 

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References

Literature Cited

1. Adkins, S. W., Loewen, M., and Symons, S. J. 1986. Variation within pure lines of wild oats (Avena fatua) in relation to degree of primary dormancy. Weed Sci. 34:859–864.Google Scholar
2. Adkins, S. W. and Simpson, G. M. 1988. The physiological basis of seed dormancy in Avena fatua. IX. Characteristics of two dormant states. Physiol. Plant 73:15–20.Google Scholar
3. Devine, M. D., Macisaac, S. A., Romano, M. L., and Hall, J. C. 1992. Investigation of the mechanism of diclofop resistance in 2 biotypes of Avena fatua . Pestic. Biochem. Physiol. 42:88–96.Google Scholar
4. Drapron, R. 1985. Enzyme activity as a function of water activity. Pages 171–190 in Simatos, D. and Moulton, J. L., eds. Properties of Water in Foods: In Relation to Quality and Stability. Martinus Nijhoff Publ., Higham, MA.Google Scholar
5. Esashi, Y., Ogasawara, M., Gorecki, R., and Leopold, A. C. 1993. Possible mechanisms of afterripening in Xanthium seeds. Physiol. Plant. 87:359–364.Google Scholar
6. Foley, M. E. 1992. Effects of soluble sugars and gibberellic acid in breaking dormancy of excised wild oat (Avena fatua) embryos. Weed Sci. 40:208–214.Google Scholar
7. Foley, M. E., Bancal, M., and Nichols, M. B. 1992. Carbohydrate status in dormant and afterripened excised wild oat embryos. Physiol. Plant. 85:461–466.Google Scholar
8. Foley, M. E., Nichols, M. B., and Myers, S. P. 1993. Carbohydrate concentrations and interactions in afterripening-responsive dormant Avena fatua caryopses induced to germinate by gibberellic acid. Seed Sci. Res. 3:271–278.Google Scholar
9. Holm, G. L., Plucknett, D. L., Pancho, J. V., and Herberger, J. P. 1977. Pages 105–113 in The World's Worst Weeds: Distribution and biology. Hawaii Univ. Press, Honolulu.Google Scholar
10. Leopold, A. C., Glenister, R., and Cohn, M. A. 1988. Relationship between water content and afterripening in red rice. Physiol. Plant. 74:659–662.CrossRefGoogle Scholar
11. Leopold, A. C. and Vertucci, C. W. 1989. Moisture as a regulator of physiological reactions in seeds. Pages 51–67 in Seed Moisture. Crop Sci. Soc. Am., Madison, WI.Google Scholar
12. Li, B. and Foley, M. E. 1993. Afterripening-induced gene expression in dormant wild oat embryos. Suppl. Plant Physiol. 102:74.Google Scholar
13. Metzger, J. D. 1983. Role of endogenous plant growth regulators in seed dormancy of Avena fatua Plant Physiol. 73:791–795.Google Scholar
14. Naylor, J. M. and Simpson, G. M. 1961. Dormancy studies in seed of Avena fatua. 2. A gibberellin-sensitive inhibitory mechanism in the embryo. Can. J. Bot. 39:281–295.Google Scholar
15. Quail, P. H. and Carter, O. G. 1969. Dormancy in seed of Avena ludoviciana and A. fatua . Aust. J. Agric. Res. 20:1–11.Google Scholar
16. Raju, M. V. S., Hsiao, A. I., and McIntyre, G. I. 1986. Seed dormancy in Avena fatua. III. The effects of mechanical injury on the growth and development of the root and scutellum. Bot. Gaz. 147:443–452.Google Scholar
17. Rockland, L. B. 1960. Saturated salt solutions for static control of relative humidity between 5° and 40°C. Anal. Chem. 32:1375–1376.Google Scholar
18. Schneider, M. J. T. and Schneider, A. S. 1972. Water in biological membranes: Adsorption isotherms and circular dichroism as a function of hydration. J. Membr. Biol. 9:127–140.Google Scholar
19. Vertucci, C. W. 1989. The effects of low water contents on physiological activities of seeds. Physiol. Plant. 77:172–176.Google Scholar
20. Vertucci, C. W. and Leopold, A. C. 1984. Bound water in soybean seed and its relationship to respiration and imbibitional damage. Plant Physiol. 75:114–117.Google Scholar
21. Wettlaufer, S. H. and Leopold, A. C. 1991. Amadori and Maillard reactions in seeds. Plant Physiol. 97:165–169.CrossRefGoogle Scholar
22. Winston, P. W. and Bates, D. H. 1960. Saturated solutions for the control of humidity in biological research. Ecology 41:232–237.Google Scholar