Hemstad, P. R.

Luby, J. J.

English

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Genetic resources, e\·aJuation and screening MASSE; PULLIAT; 1877: Le Vignoble, Vol. Il. G. Massen Editeur, Paris. MOLO!', G.; 1906: Ampelografia. Vol. I, Il. Milane. ÜDART, A. P.; 1849: Ampelographie Universelle ou Traite des Cepages. Librairie Agricole De Dusaco, Paris. 23 P ALUDETII, G.; C.->.LO, G.; 1988: Elenroforesi di estrani enzirnatici in l·'iris sp.: nota metodologica. Riv. Viticolt. Enol. 41, 365-374. RAPP, A.; H.->.STRJCH, H.; ENGEL, L.; 1978: Analyse par chromarographie capillaire des constituants aromatiques des vins et des raisins; possibilites d 'identif1cation des varietes. Genetique et Amelioration de la Vigne, Bordeaux, 417-428. VIALA, P.; VERMOREL, V.; 1901: Ampelographie, Vol. Il, Paris. Evaluation and utilization of Vitis riparia as a source of genes for extreme cold hardiness P. R. HB1STAD and J. J. Lt:BY Depanment ofHonicultural Science and Landscape Architecture, University ofMirtnesota, St. Paul, MN, 55108, US.-\ Abstract : The goal ofthe University oflYÜnnesota grape breeding program is to develop high quality wine and table cultivars that tolerate winter temperatures as Jow as -35 °C and ripen in a relatively cooL shon growing season. 1\orthern clones of Vitis riparia have been collected, evaluated and used in the breeding program. Genorypes of V. riparia fi·om the northem ponion of the species range experience wimer remperatures of -40 °C or lower. In addition to extreme cold hardiness, these geüotypes also.exhibit early ripening, high sugar Ievels. and resistance to powdery mildew and phylloxera. Deleterious traits of many V. riparia clones include high acidity, small duster and ben-y size, very darkjuice, strong characteristic Om·or, and excessive vegetative growth. Over 100 V. riparia clones have been selected and evaluated in Minnesara over the past decade. Theseclonesexhibit substantial variabiliry for the viticulrural traits mentioned above. For example, sugar Ievels typically range from 23 to 28 °Brü.:; titratable acidity ranges from under 2% to over 4 %;juice color varies from very dark purple to light red; time ofleafsenescence can vary by 2 to 3 weeks. Comrolled environment studies indicate that early acclimation in these nonhem clones is photoperiod~induced. Superiorclones crossed with V: vinifera and interspecific hybrid cultivars produced selections in the F 1 and subsequenr generations that were viticülrurally and enologically acceptable. Same of these selections have suiTered minimal injury after expetiencing midwinter temperatures as low as-3 5 oc, bothin the vineyard andin Iabaratory freezing studies. 

Evaluation and utilization of Vitis riparia as a source of genes for extreme cold hardiness

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Evaluation and utilization of Vitis riparia as a source of genes for extreme cold hardiness

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