Abstract
The studies were carried out in 1994-1997. The experimental bushes were grown in Puławy. Eight cultivars were examined ('Ben Alder', 'Ben Lomond', 'Ben Nevis', 'Ben Tirran', 'Ceres', 'Ojebyn', 'Titania', 'Triton'). Pollen grains viability was estimated in acetocarmine slides, while germination ability was estimated on agar medium. All cultivars showed high viability (80-100%). Weather conditions (especially temperatures at the time of blooming) had significant influence on germination ability. In colder years, only 10-40% of pollen produced pollen tubes, while in warmer years 50-80%. The biological value of blackcurrant pollen grains can be more effectively estimated on the basis of their ability to form pollen tubes than their viability.
Highlights
The majority of orchard cultivars require inter-varietal cross-pollination in order to give good fruit yield, which means that the appropriate choice of genetically compatible pollenizer is essential
Apart from structural, genetic, physiological and cytological factors the correct progress of fertilization is determined by the biological value of pollen, its viability, germination and the rate of pollen tubes growth (Wociór, 1976; Śnieżko, 1991, 1993; Szklanowska et al, 1997; Żebrowska, 1997; Kaczmarska, 2003)
Germination ability on agar medium proved to be more varied than its viability
Summary
The majority of orchard cultivars require inter-varietal cross-pollination in order to give good fruit yield, which means that the appropriate choice of genetically compatible pollenizer is essential. Cultivated clones of blackcurrant are highly self-fertile, and can develop fruits when their own pollen has reached the stigma The proper fertilization process of blackcurrant depends, among other factors, on the amount of pollen which reaches the stigma (L e c h , 1976, 2000; L e c h et al, 1997; Denisow , 2002). Bożena Denisow (Łucka et al, 1972; Kołtowski et al, 1997; Denisow , 2003) Both inaccurate and ineffective fertilization may cause a substantial loss of yield. It seems advisable to estimate the pollen grains fertility of commonly cultivated blackcurrant cultivars and those which are used in breeding
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