The possibility of obtaining seeds following placental pollinationin vitro

The paper aims at verifying the possibility of obtaining seeds following placental pollination in more than 20 species of dicotyledons and monocotyledons. Excised placentae with ovules were cultivated in solid nutrient media in Petri dishes. Pollen was transferred from anthers onto placentae, its germinating capacity being enhanced by a drop of a 5 per cent sucrose in boric acid in certain cases. Fertilization of ovules resulting in the formation of viable seeds was obtained withNicotiana tabacum, Melandrium album andAgrostemma githago. Although withPaeonia officinalis, Viola tricolor, Antirrhinum majus, Galanthus nivalis, Narcissus pseudonarcissus, Clivia miniata andTulipa gesneriana normal seed set occurred, the seeds did not germinate even after being stimulated with GA₃. The results indicate that the findings may be used for further embryological studies. The species are listed in which no seeds were obtained.