Hybridisation between Primula vulgaris and P. veris was investigated along a southwest exposed slope in a woodland in Hungary. Parent species and hybrids were identified by colour and size of the flowers. The two morphs within each taxon showed only slight differences, but discrimination of the three taxa was unambiguous. Scape and pedicel length proved to be suitable for distinguishing hybrids from P. veris on the basis of inflorescence architecture. Seed yield components showed considerable differences between the two parent species: P. veris produced more and lighter seeds per capsule than P. vulgaris did. Hybrids also differed significantly from the parent species: hybrids had the fewest and heaviest seeds per capsule among the three taxa. The two parent species did not show the slightest sign of gender specialisation: fruit number per plant, fruit set, and seed number per capsule were equal in long-styled and short-styled morphs. The two morphs, however, were not equally successful in hybrids: fruit number per plant and fruit set were significantly lower in long-styled plants than in short-styled plants, although the long-styled morph with highly exserted stigmas was expected to be in more favourable situation for pollination.
Authors:R. Szőllősi, A. Medvegy, E. Benyes, A. Németh, and E. Mihalik
Numerous experiments have suggested that in many species higher floral display can be more attractive for pollinators, but the possibility of between-flower self-pollination, namely geitonogamy may reduce the floral longevity, the fitness of both individuals and the offspring. In this study we investigated how phenological parameters (mainly floral display) change temporally and how they affect the female reproductive success of cymose Iris sibirica. We found that in blooming sequence of both individuals and the population 3 sections can be separated. The number of levels and flowers per stalks on the plants observed was very variable yearly. Female reproductive success parameters (fruit set and seed set) showed intra- and interannual variations, which were probably due to intra-plant resource allocation.