Using hydrothermal time concepts to model seed germination response to temperature dormancy loss and priming effects in Elymus elymoides

View Description

Download

small (250x250 max)

medium (500x500 max)

large ( > 500x500)

Full Resolution

PDF
Text

Description

Rating
Permanent URL	http://hdl.lib.byu.edu/1877/2066
Title	Using hydrothermal time concepts to model seed germination response to temperature dormancy loss and priming effects in Elymus elymoides
BYU Creator	Allen, Phil S.
Creator	Meyer, Susan E. Debaene-Gill, Susan B.
Keywords	after-ripening; dormancy; Elymus elymoides; hydrothermal time; modelling; priming; seed germination
Description/Abstract	Hydrothermal time (HTT) describes progress toward seed germination under various combinations of incubation water potential (Ψ) and temperature (T). To examine changes in HTT parameters during dormancy loss, seeds from two populations of the bunchgrass Elymus elymoides were incubated under seven temperature regimes following dry storage at 10, 20 and 30 °C for intervals from 0 to 16 weeks. Fully after-ripened seeds were primed for 1 week at a range of s. Data on germination rate during priming were used to obtain a HTT equation for each seed population, while data obtained following transfer to water were used to calculate HTT accumulation during priming. HTT equations accurately predicted germination time course curves if mean base water potential, b(50), was allowed to vary with temperature. b(50) values increased linearly with temperature, explaining why germination rate does not increase with temperature in this species. b(50) showed a linear decrease as a function of thermal time in storage. Slopes for the T x b(50) relationship did not change during after-ripening. This thermal after-ripening time model was characterized by a single base temperature and a constant slope across temperatures for each collection. Because the difference between initial and final b(50)s was uniform across tempera-tures, the thermal after-ripening requirement was also a constant. When seeds were primed for 1 week at 4 to 20 MPa, accumulation of HTT was a uniform 20% of the total HTT requirement. When primed at 0 to ?4 MPa, HTT accumulation decreased linearly with decreasing priming potential, and a hydrothermal priming time model using a constant minimum priming potential adequately described priming effects. Use of these simple HTT relationships will facilitate modelling of germination phenology in the field.
Source	Seed Science Research 10.3(Sep 2000): 213-223.;
Publisher	Cambridge University Press
Date Original	2000-09-01
Language	English eng en
Publication Type	Articles
Type	Text
Format	application/pdf
Owning Institution	Brigham Young University
BYU College	College of Life Sciences
BYU Department	Plant and Wildlife Sciences
Copyright Status	(c) 2000 Cambridge University;
Copyright Use Information	http://www.lib.byu.edu/generic_copyright.html

Comments

Post a Comment for Using hydrothermal time concepts to model seed germination response to temperature dormancy loss and priming effects in Elymus elymoides

you wish to report:

Your comment:

Your Name:

Submit

Cancel

...

Find results with:

Searching collections:

Home Using hydrothermal time concepts to model seed germination response to temperature dormancy loss...

Using hydrothermal time concepts to model seed germination response to temperature dormancy loss and priming effects in Elymus elymoides

Description

Tags

Comments