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Effects of Temperature and Water Potential on Germination of Horehound (Marrubium vulgare) Seeds from two Australian Localities

Published online by Cambridge University Press:  12 June 2017

Attila Lippai ,
Paula A. Smith ,
Terence V. Price ,
John Weiss  and
Christopher J. Lloyd
Attila Lippai
Affiliation:
School of Agriculture, La Trobe University. Bundoora. Vic., Australia 3083
Paula A. Smith
Affiliation:
School of Agriculture, La Trobe University. Bundoora. Vic., Australia 3083
Terence V. Price
Affiliation:
School of Agriculture, La Trobe University. Bundoora. Vic., Australia 3083
John Weiss
Affiliation:
Keith Turnbull Research Institute, Department of Conservation and Natural Resources, P.O. Box 48, Frankston, Vic., Australia 3199
Christopher J. Lloyd
Affiliation:
School of Statistics, La Trobe University
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Abstract

Horehound seed from Wyperfeld (Wyp90 and Wyp93) had optimum germination (98%) at constant 25 C and alternating 30/15 C at 0 MPa, while seed from Swift's Creek (SC93) had optimum germination at constant 25 to 27 C (84%) or alternating 25/15 C (95%). The Generalized Additive Models showed the effects of the three covariates (temperature, temperature difference and water potential) followed a smooth and regular pattern. Germination of SC93, Wyp90 and Wyp93 seed increased (P < 0.001) by 9.1, 6.1, and 11.6% for each degree increase in temperature difference but decreased (P < 0.001) with decreases in water potential by a factor of 4.1, 4.8, and 7.1 respectively, and ceased at −1.5 MPa. At constant temperatures the odds of germination were 27, 19, and 18% smaller for water potentials of 0, −0.25 and −0.5 MPa than when alternating temperatures varied by 15 C.

Keywords

Horehound, Marrubium vulgare ♯ MAQVULamiaceaepolyethylene glycolsmooth additive model
Type
Weed Biology and Ecology
Information
Weed Science , Volume 44 , Issue 1 , March 1996 , pp. 91 - 99
Copyright
Copyright © 1996 by the Weed Science Society of America 

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