Determining the Degree of Frost-hardiness in Highly Hardy Plants


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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  1. 1

    Parker, J., Nature, 187, 1133 (1960).

  2. 2

    Tumanov, I. I., and Krasavtsev, O. A., Fiziologiya Rast., 6, 654 (1959).

  3. 3

    Sakai, A., Low Temp. Sci., B, 22, 1 (1964).

  4. 4

    Sakai, A., Low Temp. Sci., B, 14, 17 (1956).

  5. 5

    Sakai, A., Nature, 185, 393 (1960).

  6. 6

    Sakai, A., Low Temp. Sci., B, 20, 121 (1962).

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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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