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Am. J. Enol. Vitic. 54:1:8-14 (2003)
Copyright © 2003 by the American Society for Enology and Viticulture.
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Dormancy, Cold Hardiness, and Spring Frost Hazard in Vitis amurensis Hybrids under Continental Climatic Conditions

László G. Kovács 1, Patrick L. Byers 1, Martin L. Kaps 1, and José Saenz 1

1 Missouri State Fruit Experiment Station, Southwest Missouri State University, 9740 Red Spring Road, Mountain Grove, MO 65711.

email: lgk378t{at}smsu.edu

Seven Vitis amurensis hybrid selections were studied for intensity of dormancy, winter hardiness, and earliness of budbreak during the 2000/2001 dormant season under continental climatic conditions in southern Missouri. Results of a budbreak assay demonstrated that buds from six of the seven hybrid selections could be released from dormancy under forcing conditions as early as October. Throughout November and December, the intensity of dormancy was lower in all V. amurensis hybrids than in the French-American hybrid variety Vignoles. These observations suggest that endodormancy is relatively short in V. amurensis hybrids. In these grapes, the first evidence of bud growth in the field was observed in early January, two to three weeks earlier than in Vignoles. Bud and shoot growth were several phenological stages in advance of Vignoles throughout late winter and early spring. The examination of buds at the end of the dormant season revealed that primary bud mortality was lower (p le0.05) in three of the V. amurensis hybrid selections than in Vignoles. A late spring frost event, however, destroyed large numbers of emerging shoots on the hybrid selections, killing 37 to 93% of the young shoots at node positions 1 through 5. All seven of the V. amurensis hybrid selections suffered greater spring frost damage (p le0.05) than Vignoles, which was at a considerably less advanced phenological stage. The data suggest that V. amurensis has limited value as a genetic resource in continental North America, where winters are characterized by widely fluctuating temperatures and spring frosts are common.

Note:
Acknowledgments: This work was supported by funds through the Grape Crop Germplasm Committee under grant number 59-1907-0027 from the USDA. The authors wish to thank Betsy Matthews, Hideaki Hanami, and Guoqiang Du for their technical assistance and Marilyn Odneal for her critical reading of the manuscript.

Key words: Dormancy, budbreak, hardiness, frost, hybrid, Vitis amurensis






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Copyright © 2003 by the American Society for Enology and Viticulture.