Dormancy release during hydrated storage in Lolium rigidum seeds is dependent on temperature, light quality and hydration status

Steadman, Kathryn J. (2004) Dormancy release during hydrated storage in Lolium rigidum seeds is dependent on temperature, light quality and hydration status. Journal of Experimental Botany, 55 398: 929-937. doi:10.1093/jxb/erh099


Author Steadman, Kathryn J.
Title Dormancy release during hydrated storage in Lolium rigidum seeds is dependent on temperature, light quality and hydration status
Formatted title
Dormancy release during hydrated storage in Lolium rigidum seeds is dependent on temperature, light quality and hydration status
Journal name Journal of Experimental Botany   Check publisher's open access policy
ISSN 0022-0957
Publication date 2004-04-01
Sub-type Article (original research)
DOI 10.1093/jxb/erh099
Volume 55
Issue 398
Start page 929
End page 937
Total pages 9
Place of publication Oxford, U.K.
Publisher Oxford University Press
Language eng
Subject 320500 Pharmacology and Pharmaceutical Sciences
270402 Plant Physiology
300204 Plant Protection (Pests, Diseases and Weeds)
0607 Plant Biology
Formatted abstract
The influence of temperature, light environment, and seed hydration on the rate of dormancy release in Lolium rigidum (annual ryegrass) seeds during hydrated storage (stratification) was investigated. In a series of experiments, seeds were subjected to a range of temperatures (nine between 5 °C and 37 °C), light (white, red, far-red, and dark), and hydration (4–70 g H2O 100 g–1 FW) during stratification for up to 80 d. Samples were germinated periodically at 25/15 °C or constant 15, 20, or 25 °C with a 12 h photoperiod to determine dormancy status. Dark-stratification was an alternative, but not equivalent dormancy release mechanism to dry after-ripening in annual ryegrass seeds. Dormancy release during dark-stratification caused a gradual increase in sensitivity to light, but germination in darkness remained negligible. Germination, but not dormancy release, was greater under fluctuating diurnal temperatures than the respective mean temperatures delivered constantly. Dormancy release rate was a positive linear function of dark-stratification temperature above a base temperature for dormancy release of 6.9 °C. Dormancy release at temperatures up to 30 °C could be described in terms of thermal dark-stratification time, but the rate of dormancy release was slower at ≤15 °C (244 °Cd/probit increase in germination) than ≥20 °C (208 °Cd/probit). Stratification in red or white, but not far-red light, inhibited dormancy release, as did insufficient (<40 g H2O 100 g–1 FW) seed hydration. The influence of dark-stratification on dormancy status in annual ryegrass seeds is discussed in terms of a hypothetical increase in available membrane-bound phytochrome receptors.
Keyword After-ripening
Annual ryegrass
germination modelling
Phytochrome
Stratification
Thermal time
Weed
Winter annual
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Pharmacy Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 38 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 41 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Fri, 21 Dec 2007, 19:49:44 EST by Laura McTaggart on behalf of Faculty Of Health Sciences