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The effect of temperature on cold hardening of Loliutn perenne seedlings

Published online by Cambridge University Press:  27 March 2009

M. P. Fuller  and
C. F. Eagles
M. P. Fuller
Affiliation:
Welsh Plant Breeding Station, Aberystwyth
C. F. Eagles
Affiliation:
Welsh Plant Breeding Station, Aberystwyth
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Summary

The variation in hardening responses under different temperature regimes for three cultivars of Lolium perenne L. is described. The relative cold hardiness of the cultivars was modified by different temperatures during hardening. A threshold temperature existed above which hardening did not occur, but this temperature varied between cultivars.

Although continuous low temperatures (2 °C) favoured hardening, hardening also occurred under warm day and cool night conditions (15:2 °C) where cultivars showed contrasting hardiness responses in daylengths of 16, 12 and 8 h. Under some of these conditions both leaf growth and hardiness were possible.

The significance of these results is discussed in terms of the development of screening techniques and breeding objectives.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 95 , Issue 1 , August 1980 , pp. 77 - 81
Copyright
Copyright © Cambridge University Press 1980

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