VARIABILITY IN THE AUTOCHTHONOUS VINE VARIETY KRATOSIJA
Kratosija is an old Montenegrin grapevine variety of unknown origin. By the middle of the 19th century it dominated the Montenegrin variety list. Today it has little presence in Montenegrin vineyards because of its heterogeneity and it is mostly combined with the Vranac variety. To gain a better understanding of total variability of Kratosija and some of its biotypes, its ampelographic description, agrobiological properties (phenology, yield and vegetative potential, etc.), pollen vitality and fruit set have been investigated. In this research a focus was put on functional ability of pollen and its germination, as well as the degree of fruit set under self and open pollination conditions. Seventeen biotypes of Kratosija were sampled from all vine-growing districts of Montenegro and planted in the experimental vineyard of the Biotechnical Institute. There were differences in pollen germination in culture among several clones of Kratosija. In Velja Kratosija and Srednja Kratosija, germination was >40%, while in most clones it was >30%. For biotypes Srednji Vranac, Vran, Lutica, Vrancic, Bikaca and Rehuljaca germination was <30%. Percent fruit set under self pollination conditions across all clones of Kratosija was 37.1, while under open pollination conditions it was much higher (53.5%). Significant annual fluctuations in fruit set were observed under both self and open pollination conditions. Fruit set was higher under open pollination conditions, followed by pollination by a mixture of pollen from the experimental vineyard. Strong correlations existed between germination of pollen and fruit set in most of Kratosija biotypes.
Maras, V., Milutinovic, M. and Pejovic, L. (2004). VARIABILITY IN THE AUTOCHTHONOUS VINE VARIETY KRATOSIJA. Acta Hortic. 640, 237-241
heterogeneous, biotypes, pollen germination, fruit set, self-pollination, open pollination