Immunological characteristic of Gherkins breeding materials towards resistance to downy mildew
Abstract
S.V. Bondarenko, S.V. Stankevych*, L.V. Zhukova, V.V. Horiainova, А.A. Poedinceva, L.V. Nemerytska, D.T. Gentosh, I. Nasinnyk, I. Nasinnyk, O.H. Afanasieva, O.V. Romanov, T.A. Romanova, O.M. Bragin, I.M. Hordiienko and O.V. Gepenko
At present, a comprehensive assessment of breeding (in a broad aspect) material in order to search for and select the initial forms resistant to downy mildew and further creation (selection and multiple self-pollination) on their basis an initial resistant material of Gherkins is exceptionally relevant and priority for domestic agricultural science. It was obtained an immunological characteristic of 331 breeding samples (collection, hybrid, linear, initial material) of Gherkins of Ukrainian and World breeding according to the level of downy mildew resistance under natural infectious background. It was selected groups of 63 samples (or 19 %) of cucumber– promising sources of genetic resistance to downy mildew, the lesion degree of which under the field conditions at the end of the first decade of mass plants fruiting did not exceed the value of 10 % (score 7 of the immunological scale). It was identified a group of 139 samples (42 %), which revealed suitability for purposeful tandem selection of promising sources in order to harmoniously combine high downy mildew resistance in their genotypes in a complex with other valuable for selection and production traits.