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The effect of water stress on the temperature range for germination of Orobanche aegyptiaca seeds

Published online by Cambridge University Press:  22 February 2007

Ermias Kebreab  and
Alistair J. Murdoch
Ermias Kebreab
Affiliation:
Department of Agriculture, The University of Reading, Earley Gate, PO Box 236, Reading RG6 6AT, UK
Alistair J. Murdoch*
Affiliation:
Department of Agriculture, The University of Reading, Earley Gate, PO Box 236, Reading RG6 6AT, UK
*
*Correspondence Fax: +44 (0)118 931 8297 Email: [email protected]
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Abstract

Non-dormant seeds of Orobanche aegyptiaca were incubated at water potentials of 0 to –1.33 MPa and at constant temperatures from 5 to 29°C. Effects of water potential and temperature on final germination were modelled. In general, germination increased with increased temperature from 5 to 20°C and decreased above 26°C. Maximum germination occurred at 20–26°C and 0 MPa. Germination was reduced as the water potential decreased. Water potential also affected the temperature range over which high germination was observed; at 0 MPa high germination occurred over 9° (17–26°C) compared with 3° at -1.25 MPa (17–20°C). The optimum germination temperature also tended to decrease with a decrease in water potential. Final germination could be accounted for by seed-to-seed variation in the population assuming that each seed had a minimum temperature for germination and a maximum temperature above which it would not germinate. Seed-to-seed variation in these characteristics was assumed to be normally distributed, and it was further assumed that the two characteristics were independent. Effects of water potential on these temperature requirements were quantified, and the resulting empirical model accounted for final germination with reasonable accuracy (R2= 0.96).

Keywords

broomrapemodellingOrobanche aegyptiacagerminationtemperaturewater potential
Type
Research Article
Information
Seed Science Research , Volume 10 , Issue 2 , June 2000 , pp. 127 - 133
Copyright
Copyright © Cambridge University Press 2000

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