Skip to main content Accessibility help
×
Home

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

  • Diego Batlla (a1) and Roberto Luis Benech-Arnold (a1)

Abstract

A model for simulating Polygonum aviculare L. seed dormancy loss in relation to stratification temperature was developed. The model employs the lower limit temperature for germination (Tl) as an index of seed population dormancy status. While population mean for Tl (Tl(50)) and Tl distribution within the population (σTl) are allowed to vary as seeds are released from dormancy, other thermal parameters characterizing the germination thermal responses (base, optimal and maximal temperatures, and thermal time required for germination) and the higher limit temperature for germination (Th) are held constant. In order to relate changes in Tl(50) and σTl to variable time and temperature, a stratification thermal time index (Stt) was developed, which consists of the accumulation of thermal time units under a threshold temperature for dormancy loss to occur. Therefore, Tl(50) and σTl varied in relation to the accumulation of Stt according to time and temperature. To derive model equations, changes in seed population thermal parameters were estimated for buried seeds stored at 1.6, 7 and 12°C for 110 d. Seeds were exhumed at regular intervals, and were incubated at 15°C and at a gradually increasing temperature regime in the range 6–25°C. The germination time-course curves obtained were reproduced using a mathematical model. Thermal parameters that best fit simulated and experimentally obtained germination time-course curves were determined. Model performance was evaluated against data of two unrelated experiments, showing acceptable prediction of timing and percentage of germination of seeds exhumed from field and controlled temperature conditions.

Copyright

Corresponding author

*Correspondence Fax: +54–11–4524–8039 Email: batlla@mail.agro.uba.ar

References

Hide All
Anonymous. (2000) Welcome to squeak! Available at http://www.squeak.org. Accessed 24 November, 2000.
Baskin, C.C. and Baskin, J.M. (1988) Germination ecophysiology of herbaceous plant species in a temperate region. American Journal of Botany 75, 286305.
Bauer, M.C., Meyer, S.E. and Allen, P.S. (1998) A simulation model to predict seed dormancy loss in the field for Bromus tectorum L. Journal of Experimental Botany 49, 12351244.
Benech-Arnold, R.L. and Sánchez, R.A. (1995) Modelling weed seed germination. pp 545566in Kigel, J.;Galili, G. (Eds) Seed development and germination. New York, Marcel Dekker.
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, 105122.
Bouwmeester, H.J. (1990) The effect of environmental conditions on the seasonal dormancy pattern and germination of weed seeds. Ph.D. thesis, Wageningen Agricultural University.
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, 8894.
Bradford, K.J. (1996) Population-based models describing seed dormancy behaviour: Implications for experimental design and interpretation. pp. 313339in Lang, G.A. (Eds). Plant dormancy: Physiology, biochemistry, and molecular biology. Wallingford, UK, CAB International.
Bradford, K.J. (2002) Applications of hydrothermal time to quantifying and modeling seed germination and dormancy. Weed Science 50, 248260.
Courtney, A.D. (1968) Seed dormancy and field emergence in Polygonum aviculare. Journal of Applied Ecology 5, 675684.
Forcella, F., Benech-Arnold, R.L., Sánchez, R.A. and Ghersa, C.M. (2000) Modelling seedling emergence. Field Crops Research 67, 123139.
Hammerton, J.L. (1964) Variations in the after-ripening requirement of Polygonum aviculare L. seeds. Proceedings of the British Weed Control Conference 7, 628634.
Karssen, C.M. (1982) Seasonal patterns of dormancy in weed seeds. pp. 243270in Khan, A.A. (Ed.) The physiology and biochemistry of seed development, dormancy and germination. Amsterdam, Elsevier.
Kebreab, E. and Murdoch, A.J. (2000) The effect of water stress on the temperature range for germination of Orobanche aegyptiaca seeds. Seed Science Research 10, 127133.
Kruk, B.C. and Benech-Arnold, R.L. (1998) Functional and quantitative analysis of seed thermal responses in prostrate knotweed (Polygonum aviculare) and common purslane (Portulaca oleracea). Weed Science 46, 8390.
Kruk, B.C. and Benech-Arnold, R.L. (2000) Evaluation of dormancy and germination responses to temperature in Carduus acanthoides and Anagallis arvensis using a screening system, and relationship with field-observed emergence patterns. Seed Science Research 10, 7788.
Murdoch, A.J. (1998) Dormancy cycles of weed seeds in soil. Aspects of Applied Biology 51, 119126.
Pritchard, H.W., Tompsett, P.B. and Manger, K.R. (1996) Development of a thermal time model for the quantification of dormancy loss in Aesculus hippocastanum seeds. Seed Science Research 6, 127135.
Probert, R.J. (1992) The role of temperature in germination ecophysiology. pp. 285325in Fenner, M. (Ed.) Seeds. The ecology of regeneration in plant communities. Wallingford, UK, CAB International.
Ransom, E.R. (1935) The inter-relations of catalase, respiration, after-ripening, and germination in some dormant seeds of the Polygonaceae. American Journal of Botany 22, 815825.
Roberts, E.H. and Smith, R.D. (1977) Dormancy and the pentose phosphate pathway. pp. 385411in Khan, A.A. (Ed.) The physiology and biochemistry of seed dormancy and germination. Amsterdam, North Holland Publishing Company.
Russell, S.J. and Norvig, P. (1995) Artificial intelligence: A modern approach. Englewood Cliffs, New Jersey, Prentice Hall.
Totterdell, S. and Roberts, E.H. (1979) Effects of low temperatures 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, 131137.
Vegis, A. (1964) Dormancy in higher plants. Annual Review of Plant Physiology 15, 185224.
Vleeshouwers, L.M. (1997) Modelling weed emergence patterns. Ph.D. thesis, Wageningen Agricultural University.
Vleeshouwers, L.M. and Bouwmeester, H.J. (2001) A simulation model for seasonal changes in dormancy and germination of weed seeds. Seed Science Research 11, 7792.
Vleeshouwers, L.M., Bouwmeester, H.J. and Karssen, C.M. (1995) Redefining seed dormancy: An attempt to integrate physiology and ecology. Journal of Ecology 83, 10311037.
Washitani, I. (1985) Germination-rate dependency on temperature of Geranium carolinianum seeds. Journal of Experimental Botany 36, 330337.
Washitani, I. (1987) A convenient screening test system and a model for thermal germination responses of wild plant seeds: behavior of model and real seed in the system. Plant, Cell and Environment 10, 587598.

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed