Stimulating dormancy release and emergence of annual ryegrass (Lolium rigidum) seeds using short-term hydrated storage in darkness

Steadman, Kathryn J., Bignell, Gavin P. and Michael, Pippa J. (2004) Stimulating dormancy release and emergence of annual ryegrass (Lolium rigidum) seeds using short-term hydrated storage in darkness. Australian Journal of Agricultural Research, 55 7: 787-795. doi:10.1071/AR04010


Author Steadman, Kathryn J.
Bignell, Gavin P.
Michael, Pippa J.
Title Stimulating dormancy release and emergence of annual ryegrass (Lolium rigidum) seeds using short-term hydrated storage in darkness
Journal name Australian Journal of Agricultural Research   Check publisher's open access policy
ISSN 0004-9409
Publication date 2004-01-01
Sub-type Article (original research)
DOI 10.1071/AR04010
Volume 55
Issue 7
Start page 787
End page 795
Total pages 9
Place of publication Collingwood
Publisher CSIRO Publishing
Language eng
Subject 0701 Agriculture, Land and Farm Management
Abstract Experiments were performed to determine whether the dormancy release effect of hydrated storage in darkness (dark-stratification) is common amongst annual ryegrass populations and has the potential to occur under field conditions. Dormant seeds from all populations tested (22) became sensitive to light during dark-stratification, enabling them to germinate when subsequently exposed to light. Under controlled temperature (25/15degreesC), light (12-h photoperiod), and hydration (solidified agar-water) conditions, more seeds germinated by 28 days if the first 14 days were in darkness followed by exposure to light for 12 h per day than if they were exposed to light throughout or darkness throughout. Constraint over the conditions imposed during dark-stratification and germination was gradually reduced to investigate whether the dormancy release effect was diminished. Dark-stratification was effective in promoting germination when performed under natural diurnal temperatures, and burial in moist soil provided suitable conditions for dark-stratification to occur. The surface of moist soil, with natural diurnal temperatures and sunlight, was suitable for germination of dark-stratified seeds. Dark-stratification is a quick and effective means to enhance the sensitivity of dormant annual ryegrass seeds to light, enabling the majority of the population to germinate. However, large quantities of light are required to promote germination of dark-stratified seeds, so buried seeds must be moved to the soil surface to allow exposure to adequate light for germination.
Keyword Agriculture, Multidisciplinary
After-ripening
Dormancy Loss
Emergence Prediction
Light Environment
Dark-stratification
Temperature
Weed Biology
Winter Annual
After-ripening Time
Light Sensitivity
Soil
Germination
Tillage
Weeds
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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Created: Tue, 14 Aug 2007, 00:30:58 EST