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Alleviation of dormancy in annual ryegrass (Lolium rigidum) seeds by hydration and after-ripening

Published online by Cambridge University Press:  20 January 2017

Robert S. Gallagher ,
Kathryn J. Steadman  and
Andrew D. Crawford
Kathryn J. Steadman
Affiliation:
Western Australian Herbicide Resistance Initiative, School of Plant Biology, University of Western Australia, Crawley, Western Australia 6009, Australia
Andrew D. Crawford
Affiliation:
Western Australian Herbicide Resistance Initiative, School of Plant Biology, University of Western Australia, Crawley, Western Australia 6009, Australia
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Abstract

The effect of hydration (priming) treatment on dormancy release in annual ryegrass seeds from two populations was investigated. Hydration duration, number, and timing with respect to after-ripening were compared in an experiment involving 15 treatment regimens for 12 wk. Seeds were hydrated at 100% relative humidity for 0, 2, or 10 d at Weeks 1, 6, or 12 of after-ripening. Dormancy status was assessed after each hydration treatment by measuring seed germination at 12-hourly alternating 25/15 C (light/dark) periods using seeds directly from the hydration treatment and seeds subjected to 4 d postpriming desiccation. Seeds exposed to one or more hydration events during the 12 wk were less dormant than seeds that remained dry throughout after-ripening. The longer hydration of 10 d promoted greater dormancy loss than either a 2-d hydration or no hydration. For the seed lot that was most dormant at the start of the experiment, two or three rather than one hydration event or a hydration event earlier rather than later during after-ripening promoted greater dormancy release. These effects were not significant for the less-dormant seed lot. For both seed lots, the effect of a single hydration for 2 d at Week 1 or 6 of after-ripening was not manifested until the test at Week 12 of the experiment, suggesting that the hydration events alter the rate of dormancy release during subsequent after-ripening. A hydrothermal priming time model, usually used for modeling the effect of priming on germination rate of nondormant seeds, was successfully applied to dormancy release resulting from the hydration treatments.

Keywords

Annual ryegrass, Lolium rigidum GaudDormancygerminationhydrothermal timemodelingprimingweed seed
Type
Weed Biology and Ecology
Information
Weed Science , Volume 52 , Issue 6 , December 2004 , pp. 968 - 975
Copyright
Copyright © Weed Science Society of America 

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