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

Gallagher, Robert S., Steadman, Kathryn J. and Crawford, Andrew D. (2004) Alleviation of dormancy in annual ryegrass (Lolium rigidum) seeds by hydration and after-ripening. Weed Science, 52 6: 968-975. doi:10.1614/WS-04-075R


Author Gallagher, Robert S.
Steadman, Kathryn J.
Crawford, Andrew D.
Title Alleviation of dormancy in annual ryegrass (Lolium rigidum) seeds by hydration and after-ripening
Journal name Weed Science   Check publisher's open access policy
ISSN 0043-1745
Publication date 2004
Sub-type Article (original research)
DOI 10.1614/WS-04-075R
Volume 52
Issue 6
Start page 968
End page 975
Total pages 8
Place of publication Lawrence
Publisher Weed Science Society of America
Language eng
Subject 0701 Agriculture, Land and Farm Management
0706 Horticultural Production
0703 Crop and Pasture Production
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.
Keyword Agronomy
Plant Sciences
Dormancy
Germination
Hydrothermal Time
Modeling
Priming
Weed Seed
Lettuce Seeds
Temperature
Deterioration
Release
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Pharmacy Publications
 
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