The influence of the degree of pollination of black currant flowers (Ribes nigrum L.) on the number of seeds in fruits and its size
2002
Denisow, B.,Lublin Agricultural University (Poland). Dept. of Botany. Lab. of Biology of Horticultural Plants
The experiment using the randomized block method was conducted in 1994-97 in Pulawy (Poland). 8 cultivars of black currant: Ben Alder, Ben Lomond, Ben Nevis, Ben Tirran, Ceres, Ojebyn, Titania and Triton were examined. The influence of the degree of pollination measured by the number of pollen grains per stigma on the number of seeds in fruits and its size were examined. The pollen grains were counted in crushed slides in lactophenol. The degree of pollination positively correlated with the number of seeds in berries. The best free-pollinated flowers with over 200 pollen grains per stigma set an average of 26 seeds. However, an almost 50 percent decrease in pollination made by only one bumble bee queen did not cause a significant decrease of seed setting (an average of 22 per one berry). This suggests the existence of an upper limit above which an increase in the quantity of pollen per stigma does not result in an increase of efficiency during fertilization
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