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Temperature-induced changes in cold tolerance of Lolium perenne

Published online by Cambridge University Press:  27 March 2009

C. F. Eagles
C. F. Eagles
Affiliation:
Agricultural and Food Research Council, Institute of Grassland and Animal Production, Welsh Plant Breeding Station, Aberystwyth, Dyfed, UK
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Summary

Responses of cultivars of Lolium perenne with contrasting winter hardiness to hardening and dehardening at different temperatures were studied in controlled-environment experiments in 1984/85. After hardening at 2 °C, the hardy cultivars Premo and S23 had faster initial rates of change of LT50 (lethal temperature at which 50% of plants were killed), measured on seedlings in an artificial freezing test, and achieved a greater degree of cold tolerance than the susceptible cultivar Grasslands Ruanui. When acclimated at higher temperatures (4–10 °C), the hardier cultivars were better able to develop increased cold tolerance than Grasslands Ruanui. Plants of Premo and S23, previously hardened at 2 °C, maintained their cold tolerance when transferred to warmer temperatures (4–12 °C) better than Grasslands Ruanui, which dehardened even at 4 °C.

The responses of the cultivars to hardening and dehardening temperatures under controlled-environment conditions were reflected in seasonal changes in hardiness, measured as cold tolerance of tillers sampled during fluctuating temperatures of a typical maritime winter (1977/78) at Aberystwyth, UK.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 113 , Issue 3 , December 1989 , pp. 339 - 347
Copyright
Copyright © Cambridge University Press 1989

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