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A simulation model for seasonal changes in dormancy and germination of weed seeds

Published online by Cambridge University Press:  22 February 2007

Leo M. Vleeshouwers  and
Harro J. Bouwmeester
Leo M. Vleeshouwers*
Affiliation:
Wageningen University, Department of Plant Sciences, Crop and Weed Ecology Group, PO Box 430, 6700AK Wageningen, The Netherlands
Harro J. Bouwmeester
Affiliation:
Wageningen University, Laboratory of Plant Physiology, Arboretumlaan 4, 6703PD Wageningen, The Netherlands
*
*Correspondence Fax: +31 317 484892 Email: leo.vleeshouwers@pp.dpw.wau.nl
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Abstract

A model has been developed to simulate the annual dormancy cycle of seeds of light-requiring species in the seed bank and the germination of exhumed seeds after irradiation. Simulation of dormancy and germination is based on a physiological model concerning the action of phytochrome in the seed. Dormancy is related to the amount of a hypothetical phytochrome receptor, which fluctuates in an annual pattern. Relief of dormancy is equivalent to an increase in the amount of receptor, and induction of dormancy is equivalent to a decrease in the amount of receptor. Annual changes in temperature are the driving force for annual changes in the amount of phytochrome receptor in seeds that are buried in the seed bank. From the average amount of phytochrome receptor in the seeds of a population, the model calculates the germination percentage that is reached when a seed sample from the population is exhumed, irradiated and incubated at a given temperature in darkness. In the model, relief of dormancy results in a widening of the range of temperatures over which germination can occur, and induction of dormancy results in a narrowing of this range. Model parameters were estimated by fitting the model to data from a burial experiment with seeds of Polygonum persicaria L., Chenopodium album L. and Spergula arvensis L. At regular time intervals during 3 years, subsamples of these seeds were exhumed and tested for germination in the laboratory. The simulation model gave a good description of the observed cyclic changes in germinability of exhumed seeds.

Keywords

Chenopodium albumdormancy patterngerminationPolygonum persicariasimulation modelSpergula arvensisweed seeds
Type
Research Article
Information
Seed Science Research , Volume 11 , Issue 1 , March 2001 , pp. 77 - 92
Copyright
Copyright © Cambridge University Press 2001

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