PMID: 11903979Mar 21, 2002Paper

Breakage of Pseudotsuga menziesii seed dormancy by cold treatment as related to changes in seed ABA sensitivity and ABA levels

Physiologia Plantarum
Françoise CorbineauDaniel Côme

Abstract

The main aims of the present work were to investigate whether a chilling treatment which breaks dormancy of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) seeds induces changes in the sensitivity of seeds to exogenous ABA or in ABA levels in the embryo and the megagametophyte, and whether these changes are related to the breaking of dormancy. Dormant seeds germinated very slowly within a narrow range of temperatures (20-30 degrees C), the thermal optimum being approximately 25 degrees C. The seeds were also very sensitive to oxygen deprivation. Treatment of dormant seeds at 5 degrees C improved further germination, and resulted in a widening of the temperature range within which germination occurred and in better germination in low oxygen concentrations. In dry dormant seeds the embryo contained about one-third of the ABA in the megagametophyte. ABA content of both organs increased during the first 4 weeks of chilling. It then decreased sharply in the megagametophyte to the level in the embryo after 7-15 weeks of chilling. At 15 degrees C, a temperature at which dormancy was expressed, the ABA level increased in the embryo and the megagametophyte of dormant unchilled seeds whereas it decreased in the organs of chilled seeds...Continue Reading

References

Feb 13, 2001·Neurogastroenterology and Motility : the Official Journal of the European Gastrointestinal Motility Society·A JégoJ Benichou
Jan 1, 1996·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·F HanI Romagosa

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Citations

Mar 9, 2005·Current Opinion in Plant Biology·Frank GublerJohn V Jacobsen
Jul 27, 2006·The New Phytologist·William E Finch-Savage, Gerhard Leubner-Metzger
May 25, 2012·Plant, Cell & Environment·Kai GraeberWim J J Soppe
Oct 31, 2009·Plant Signaling & Behavior·María del Carmen Rodríguez-GacioAngel J Matilla
Jan 27, 2015·Plant Molecular Biology·Hong Gil LeePil Joon Seo
Mar 21, 2006·Journal of Experimental Botany·Roberto L Benech-ArnoldFrançoise Corbineau
Mar 3, 2019·Plant Science : an International Journal of Experimental Plant Biology·Linda De BontFrançois Bouteau

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