engleski

PROGRESS IN CLONAL SELECTION OF CROATIAN NATIVE GRAPEVINE CULTIVARS

A high number of Grapevine varieties have been grown traditionally in Croatia, most of them considered as autochthonous. Because of lack of systematic selection within them so far, it is supposed that high level of intravarietal variability is present. Namely, long-term growing of grapevine and vegetative propagation without systematic selection is resulted by high level of intravarietal variability. It is mostly caused by mutations, which can positively or negatively influence on growing characteristics of grapevine varieties. Clonal selectin is a process of genotypes (mutants) selection within variety populations, which are modified on some important variety characteristics. Clonal selection process is required in quality plant material production, with improved variety characteristics and guaranteed healthy conditions. Scientific researches of intravarietal variability and clonal selection methods improvement can highly contribute viticulture production development, and also, they are indirectly important for genetic resources preservation. It is of essential importance for countries with high number of autochthonous varieties, because of their revitalizationprocessencouraging. In this paper we give an overview of methods and recent research of intravarietal variability, as well as grape varieties improvement through clonal selection processes. A special attention is paid on Croatian grapevines research in last ten years, results point out on high level of intravarietal variability, and necessity of clonal selection procedure for most of them. Clonal and sanitary selection of 13 most important native cultivars is in progress. Cultivars under selection are: Graševina, Plavac mali, Plavina, Žlahtina, Kraljevina, Škrlet, Moslavac, Pošip, Vugava, Debit, Maraština, Grk and Klešćec. The main goals of this process are: to ensure the source of healthy and high quality planting material of native varieties which are currently showing a high level of intravarietal variability and virus infections, especially in coastal part of Croatia and to select clones vith stabile and positive changes of some economicaly important characteristics.

grapevine clonal selection; native cultivars; intravarietal variability.

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