JXB Advance Access published online on March 12, 2004
Journal of Experimental Botany, doi:10.1093/jxb/erh099
© 2004 by Oxford University Press
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1 Western Australian Herbicide Resistance Initiative, School of Plant Biology, Faculty of Natural and Agricultural Sciences, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
* To whom correspondence should be addressed. E-mail: ksteadman{at}agric.uwa.edu.au.
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
© 2004 Society for Experimental Biology
RESEARCH PAPER
Dormancy release during hydrated storage in Lolium rigidum seeds is dependent on temperature, light quality, and hydration status
Abstract 
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.
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  D. E. Goggin, K. J. Steadman, R. J. N. Emery, S. C. Farrow, R. L. Benech-Arnold, and S. B. Powles ABA inhibits germination but not dormancy release in mature imbibed seeds of Lolium rigidum Gaud. J. Exp. Bot., August 1, 2009; 60(12): 3387 - 3396. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
W. Q. Wang, S. Q. Song, S. H. Li, Y. Y. Gan, J. H. Wu, and H. Y. Cheng Quantitative description of the effect of stratification on dormancy release of grape seeds in response to various temperatures and water contents J. Exp. Bot., August 1, 2009; 60(12): 3397 - 3406. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. Scholten, J. Donahue, N. L. Shaw, and M. D. Serpe Environmental regulation of dormancy loss in seeds of Lomatium dissectum (Apiaceae) Ann. Bot., May 1, 2009; 103(7): 1091 - 1101. [Abstract] [Full Text] [PDF]
|
|