In this paper the di- and tetraploid red clover seedlings will be compared, under the aspects of pollination, fertility and binding seeds process. After a vast amount of research, the results obtained were that, often, the low seed yield in di- and tetraploid red clover is caused by of one of these factors: the improper pollination and fertility perturbance.The purpose of the experiments during the years 2004-2006, was to determine the pollination effects and to offer important clues about di- and tetraploid red clover seed production in Transylvania’s condition. Red clover is a typical allogamous plant in which the auto incompatibility system determined by the S alleles is very strong, the pollination is compulsorily done by honey and bumble bees. The red clover flowers are very attractive to a large amount of insects, but because of the flower structure, only some sort of insects can do the pollination. The efficiency of the activity of a pollinator depends not only on the flower structure, but also on the meteorological conditions.

di- and tetraplid red clover; pollination; fertility; seed production

Presentation: oral