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A quantitative analysis of seed responses to cycle-doses of fluctuating temperatures in relation to dormancy: Development of a thermal time model for Polygonum aviculare L. seeds

Published online by Cambridge University Press:  22 February 2007

Diego Batlla ,
Virginia Verges  and
Roberto Luis Benech-Arnold
Diego Batlla*
Affiliation:
IFEVA/Cátedra de Cerealicultura, CONICET/Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE-Buenos Aires, Argentina
*
*Correspondence Fax: +54 114524 8039, Email: batlla@mail.agro.uba.ar
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Abstract

The sensitivity of Polygonum aviculare L. seeds to the dormancy-breaking effect of cycle-doses of fluctuating temperature changes as seeds lose dormancy due to storage under stratification temperatures. Sensitivity changes during seed stratification were characterized by a decrease in the number of cycles required to saturate the germination response, and by a progressive loss of the requirement for temperature fluctuations for dormancy breakage in increasing fractions of the seed population. The rate of these changes was dependent on the temperature at which seeds were stored for stratification; lower storage temperatures produced higher rates of change than higher storage temperatures. Germination curves, obtained in response to the effect of fluctuating temperature cycle-doses for seeds stratified at variable temperatures and times of storage, were brought to a common stratification thermal time (Stt) scale by accumulating thermal time units under a threshold temperature for dormancy loss to occur. Results showed that those seeds that had accumulated similar Stt units during stratification under different storage temperatures presented a similar germination response. Therefore, response-curve functions were adjusted to germination data of exhumed seeds that had accumulated similar Stt, obtaining a family of germination response curves in relation to Stt accumulation during storage. Based on these results, a simulation model was constructed relating dynamic changes in the parameters that determine germination response curves in relation to Stt accumulation. The model was tested against independent data, showing a good description of the dynamics of changes in the fraction of the seed population requiring temperature fluctuation for dormancy breakage as dormancy release progressed.

Keywords

dormancyfluctuating temperaturesgerminationPolygonum avicularestratification
Type
Research Article
Information
Seed Science Research , Volume 13 , Issue 3 , September 2003 , pp. 197 - 207
Copyright
Copyright © Cambridge University Press 2003

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References

Baskin, C.C. and Baskin, J.M. (1988) Germination ecophysiology of herbaceous plant species in a temperate region. American Journal of Botany 75, 286–305.Google Scholar
Batlla, D. and Benech-Arnold, R.L. (2003) A quantitative analysis of dormancy loss dynamics in Polygonum aviculare L. seeds: Development of a thermal time model based on changes in seed population thermal parameters. Seed Science Research 13, 55–68.Google Scholar
Benech-Arnold, R.L. and Sánchez, R.A. (1995) Modeling weed seed germination. pp. 545–566in Kigel, J.; and Galili, G., (Eds) Seed development and germination. New York, Marcel Dekker.Google Scholar
Benech-Arnold, R.L., Ghersa, C.M., Sánchez, R.A. and Insausti, P. (1990a) Temperature effects on dormancy release and germination rate in Sorghum halepense (L.) Pers. seeds: a quantitative analysis. Weed Research 30, 81–89.CrossRefGoogle Scholar
Benech-Arnold, R.L., Ghersa, C.M., Sánchez, R.A. and Insausti, P. (1990b) A mathematical model to predict Sorghum halepense seedling emergence in relation to soil temperature. Weed Research 30, 91–99.Google Scholar
Benech-Arnold, R.L., Sánchez, R.A., Forcella, F., Kruk, B.C. and Ghersa, C.M. (2000) Environmental control of dormancy in weed seed banks in soil. Field Crops Research, 67, pp 105–122.Google Scholar
Bouwmeester, H.J. (1990) The effect of environmental conditions on the seasonal dormancy pattern and germination of weed seeds. PhD thesis, Wageningen Agricultural University.Google Scholar
Bouwmeester, H.J. and Karssen, C.M. (1992) The dual role of temperature in the regulation of the seasonal changes in dormancy and germination of seeds of Polygonum persicaria L. Oecologia 90, 88–94.Google Scholar
Courtney, A.D. (1968) Seed dormancy and field emergence in Polygonum aviculare. Journal of Applied Ecology 5, 675–684.CrossRefGoogle Scholar
Derkx, M.P.M. and Karssen, C.M. (1994) Are seasonal dormancy patterns in Arabidopsis thaliana regulated by changes in seed sensitivity to light, nitrate and gibberellin? Annals of Botany 73, 129–136.CrossRefGoogle Scholar
Karssen, C.M. (1982) Seasonal patterns of dormancy in weed seeds. pp. 243–270in Khan, A.A. (Ed.) The physiology and biochemistry of seed development, dormancy and germination. Amsterdam, Elsevier Biomedical.Google Scholar
Kruk, B.C. and Benech-Arnold, R. (1998) Functional and quantitative analysis of seed thermal responses in prostrate knotweed (Polygonum aviculare) and common purslane (Portulaca oleracea). Weed Science 46, 83–90.CrossRefGoogle Scholar
Murdoch, A.J. (1998) Dormancy cycles of weed seeds in soil. Aspects of Applied Biology 51, 119–126.Google Scholar
Taylorson, R.B. and Hendricks, S.B. (1972) Phytochrome control of germination of Rumex crispus L. seeds induced by temperature shifts. Plant Physiology 50, 645–648.CrossRefGoogle ScholarPubMed
Thompson, K. and Whatley, J.C. (1983) Germination responses of naturally-buried weed seeds to diurnal temperature fluctuations. Aspects of Applied Biology 4, 71–77.Google Scholar
Totterdell, S. and Roberts, E.H. (1979) Effects of low temperature on the loss of innate dormancy and the development of induced dormancy in seeds of Rumex obtusifolius L. and Rumex crispus L. Plant, Cell and Environment 2, 131–137.Google Scholar
Totterdell, S. and Roberts, E.H. (1981) Ontogenetic variation in response to temperature change in the control of seed dormancy of Rumex obtusifolius L. and Rumex crispus L. Plant, Cell and Environment 4, 75–80.CrossRefGoogle Scholar