Differential Thermal Analysis for Large-scale Evaluation of Pear Cold Hardiness

in HortScience
Authors:
J. M. MontanoNational Clonal Germplasm Repository, 33447 Peoria Road, Corvallis, OR 97333

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M. RebhuhnNational Clonal Germplasm Repository, 33447 Peoria Road, Corvallis, OR 97333

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K. HummerNational Clonal Germplasm Repository, 33447 Peoria Road, Corvallis, OR 97333

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H. B. LagerstedtNational Clonal Germplasm Repository, 33447 Peoria Road, Corvallis, OR 97333

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Abstract

More than 4500 accessions of eight genera including Pyrus at the National Clonal Germplasm Repository, Corvallis, Ore., require testing for cold hardiness. Since pear xylem deep supercools (7), differential thermal analysis (DTA) would be a suitable test if large numbers of samples could be examined simultaneously. The object of this study was to produce a method of multichannel DTA for defining cold hardiness of pear accessions. Visual browning was also examined to confirm cold hardiness values.

Contributor Notes

Received for publication 2 Dec. 1986. Contribution of the Oregon Agricultural Experiment Station in cooperation with the ARS/USDA. Technical paper no. 8065 of the OAES. Mention of a trade mark or proprietary product does not contribute a guarantee or warranty of the product and does not imply its approval to the exclusion of other products that may also be suitable. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.

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