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Am. J. Enol. Vitic. 43:3:261-265 (1992)
Copyright © 1992 by the American Society for Enology and Viticulture.
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Ampelographic and Isozyme Data Correcting the Misnaming of the Grape Rootstock SO4 at the University of California, Davis

M. A. Walker 1 and J. M. Boursiquot 2

1 Department of Viticulture and Enology, University of California, Davis, CA 95616-8749
2 Station de Recherches Viticoles, Ecole Nationale Superieure Agronomique, Montpellier, France.

Seven selections of the grape rootstock SO4 (Selection Oppenheim #4) in the University of California, Davis, Vitis collections were misnamed and have been correctly identified as Teleki 5C. The leaves, shoots and overall appearance of SO4 and Teleki 5C were very similar, however they could be separated with several morphological features. Teleki 5C had bifid and trifid tendrils in approximately equal numbers, its young leaves and shoot tips were predominantly green, and its maturing shoots were minutely pubescent and longitudinally striped with red pigmentation. SO4 had trifid tendrils, bifid were rare, its shoot tips and young leaves had a bronze cast, and its maturing canes were glabrous and uniformly (not striped) red. Cambial scrapings from dormant canes produced reliable and consistent isozyme profiles with aspartate aminotransferase (AAT) which confirmed the ampelographic characterization of the two rootstocks.

Key words: ampelography, isozymes, SO4, Teleki 5C, rootstock

Submitted on June 14, 1991






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Copyright © 1992 by the American Society for Enology and Viticulture.