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Effect of temperature on cold dehardening of Lolium perenne L. 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

Cold dehardening responses of seedlings of three cultivars of Lolium perenne L. (Premo, S.23 and Grasslands Ruanui) were studied in different temperature regimes following hardening at 2 °C. Seedlings of the three cultivars dehardened rapidly at 15 °C after partial hardening for 4 days, whereas there was a lag before dehardening occurred in seedlings of Premo and S.23 which were hardened for 28 days. At 10 °C dehardening did not occur in Premo and S.23 and occurred only slowly in Grasslands Ruanui. Alternating temperature regimes of 15 °C(day): 2 °C (night) gave increased levels of hardiness when the daily period of exposure to 15 °C was 8 h but only maintained the level of hardiness when it was extended to 16 h.

A tentative scheme of threshold temperatures for hardening and dehardening is proposed.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 96 , Issue 1 , February 1981 , pp. 55 - 59
Copyright
Copyright © Cambridge University Press 1981

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References

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