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A predictive model for dormancy loss in Polygonum aviculare L. seeds based on changes in population hydrotime parameters

Published online by Cambridge University Press:  22 February 2007

Diego Batlla  and
Roberto Luis Benech-Arnold
Diego Batlla*
Affiliation:
IFEVA/Cátedra de Cerealicultura, CONICET/Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, Aires, C1417DSE-Buenos, Argentina
Roberto Luis Benech-Arnold
Affiliation:
IFEVA/Cátedra de Cerealicultura, CONICET/Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, Aires, C1417DSE-Buenos, Argentina
*
*Correspondence, Fax: +54 11?4524 8039/8053 (ext. 33) Email:, [email protected]
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Abstract

Changes in population hydrotime parameters were determined during stratification in Polygonum aviculare L. seeds in order to model dormancy loss. Seeds buried in pots were stored at three temperatures (1.6, 7 and 12°C) for 110 d and were exhumed at regular intervals during the storage period. Exhumed seeds were incubated at different water potentials at 15°C and germination time courses were analysed to determine hydrotime parameters. The population mean base water potential (Ψb(50)) decreased concomitantly with seed dormancy, while the hydrotime constant (θH) and the standard deviation of base water potential (θΨb) displayed only minor changes. Based on these results, a model for simulating P. aviculare seed dormancy loss in relation to low temperature was developed. The model employs Ψb(50) as an index of mean seed population dormancy status. While Ψb(50) was allowed to vary as seeds were released from dormancy, θH and θΨb were held constant. Changes in Ψb(50) were related to the time and temperature, using a previously developed thermal stratification time index (Stt), which quantifies the accumulation of thermal time units below a threshold temperature required for dormancy loss to occur. Therefore, Ψb(50) varied in relation to the accumulation of Stt according to time and temperature. Model performance showed acceptable prediction of timing and percentage of germination of seeds buried in irrigated plots, but did not accurately predict germination of seeds exhumed from rain-fed plots. Thus, environmental factors other than temperature could also be involved in the regulation of dormancy status of buried seeds under field conditions.

Keywords

dormancygerminationhydrotimePolygonum aviculare Lstratificationtemperaturewater potential
Type
Research Article
Information
Seed Science Research , Volume 14 , Issue 3 , September 2004 , pp. 277 - 286
Copyright
Copyright © Cambridge University Press 2004

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