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Downy mildew resistance is a quantitative trait in grapevines of the genus Vitis. The grapevine ‘Bianca’ has retained resistance, originally present in its North American ancestors, through several cycles of backcrossing with susceptible cultivars of Vitis vinifera followed by phenotypic selection. The genetic control of the trait was studied using 116 full-siblings from the cross ‘Chardonnay’ × ‘Bianca’...
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