Analysis of F2-F6 generations from hybridization with Vitis rotundifolia at the Institute Magarach
Studies of the progeny from hybridization of Vitis vinifera with Vitis rotundifolia at the Institute Magarach began in 1974 when DRX hybrid seeds were brought from France. The first F2 populations were obtained using DRX 58-5 and DRX 60-24 forms. Hybridization of DRX (F2) hybrids and Vitis vinifera cultivars produced seedlings (F3) characterized by high fertility and productivity. They combined vigour and pathogen-resistance characteristics of Vitis rotundifolia with Vitis vinifera properties. After 2010, studies of the gene pool that involved the Vitis rotundifolia genome continued. Hybridizations involved hybrids from Moldova, where in 1982 hybrids F3 (2n=39) and later F5 (2n=39 and 2n=38) were obtained from crosses DRX-55 × (Aramon × Vitis riparia) and DRX-55 × XIX-30/33. The study also included received from the Institute for Grapevine Breeding Geilweilerhof (Germany) hybrids 2000-305-163 and 2000-305-143 obtained from crossing of the French form MTP3082-1-42 bearing loci of oidium and mildew resistance from Vitis rotundifolia with 'Regent'. The progeny obtained from hybridization with these forms was analysed by selection value and heterosis indices. The seedlings obtained at the Institute Magarach demonstrated significant variability amplitude by morphological characteristics, fertility, productivity and pathogen resistance. The seedlings demonstrated the signs typical of Vitis rotundifolia NDASH colour, shape, leaf structure. The features typical for Vitis vinifera included elongated leaf plate, pubescence on the underside of the leaf, the bunch size, relatively thin and less rough skin often without muscadine flavour, more tender and melting flesh easily separable from long beaked seeds.
Volynkin, V., Levchenko, S., Vasylyk, I. and Likhovskoi, V. (2020). Analysis of F2-F6 generations from hybridization with Vitis rotundifolia at the Institute Magarach. Acta Hortic. 1289, 269-274
distant hybrids, progeny, DRX-forms, pollen fertility, seed germination capacity, pathogen resistance