Hop (Humulus lupulus L.) breeding aimed at resistance to mycosis
2005
Nesvadba, V.(Chmelarsky institut, Zatec (Czech Republic) | Patzak, J. | Krofta, K.
Hop breeding aimed at resistance to mycosis seems to be a more difficult process due to the fact that hop (Humulus lupulus L.) is a dioecious plant. Mother plants selected for crossing are tested on resistance to downy mildew (Peronoplasmopara humuli) with the help of artificial infections. Saaz, Sladek, Zenith, Nugget, Silnyj or Magnus belong to the group of tolerant cultivars. On the contrary Target, Vojvodina, Talisman, Galena, Olympic and Hersbrucker Pure are more sensitive varieties. After crossing progenies are selected with the help of artificial infections by powdery mildew (Sphaerotheca macularis var. humuli). Nearly sixty percent of resistant plants within a crossing process are possible to obtain in dependence on parents. Some posterities are totally destroyed. Model crossings were carried out for determination of resistance transmission in the both above-mentioned pathogens. Four mother plants Target, Magnum, Yeoman and Premiant) and four father plants (known under denominations 82/6, 86/4, 87/3 and a degenerated male plant of Saaz Osvald clone no. 72) were selected. Results show that some progenies having their origin in mothers with higher susceptibility to mycosis prove higher resistance to these diseases on average.
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