Determining the Degree of Frost-hardiness in Highly Hardy Plants

Abstract

TWIGS which can survive freezing at approximately −70° C are not injured even when exposed to extremely low temperatures1–3. Twigs taken in the middle of November from willows, poplars, white birches, etc., have survived freezing at − 70° C, and therefore subsequent seasonal fluctuations in frost-hardiness and the effectiveness of ‘hardening’ treatment cannot be determined in these twigs by the usual freezing tests. To clarify the mechanism of frost-hardening in hardy plants, it is therefore essential to find a suitable method of determining the degree of frost-hardiness in plants which can withstand freezing below − 70° C.

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References

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SAKAI, A. Determining the Degree of Frost-hardiness in Highly Hardy Plants. Nature 206, 1064–1065 (1965) doi:10.1038/2061064a0

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