Dormancy release in Lolium rigidum seeds is a function of thermal after-ripening time and seed water content

Functional Plant Biology : FPB
Kathryn J SteadmanRobert S Gallagher

Abstract

Dormancy release in seeds of Lolium rigidum Gaud. (annual ryegrass) was investigated in relation to temperature and seed water content. Freshly matured seeds were collected from cropping fields at Wongan Hills and Merredin, Western Australia. Seeds from Wongan Hills were equilibrated to water contents between 6 and 18% dry weight and after-ripened at constant temperatures between 9 and 50°C for up to 23 weeks. Wongan Hills and Merredin seeds at water contents between 7 and 17% were also after-ripened in full sun or shade conditions. Dormancy was tested at regular intervals during after-ripening by germinating seeds on agar at 12-h alternating 15°C (dark) and 25°C (light) periods.Rate of dormancy release for Wongan Hills seeds was a positive linear function of after-ripening temperature above a base temperature (Tb) of 5.4°C. A thermal after-ripening time model for dormancy loss accounting for seed moisture in the range 6-18% was developed using germination data for Wongan Hills seeds after-ripened at constant temperatures. The model accurately predicted dormancy release for Wongan Hills seeds after-ripened under naturally fluctuating temperatures. Seeds from Merredin responded similarly but had lower dormancy at collection and ...Continue Reading

Citations

Jul 27, 2006·The New Phytologist·William E Finch-Savage, Gerhard Leubner-Metzger
Jan 22, 2010·Plant Molecular Biology·Diego Batlla, Roberto Luis Benech-Arnold
Jun 3, 2009·Journal of Experimental Botany·Danica E GogginStephen B Powles
Sep 17, 2013·PloS One·Louis G BoddyAlbert J Fischer
Mar 13, 2014·Biological Reviews of the Cambridge Philosophical Society·Rowena L LongWilliam E Finch-Savage
Apr 22, 2008·The New Phytologist·Michael J HoldsworthWim J J Soppe

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