The effect of temperature on seed germination of four species of Hypericum genus
Ewa Osińska, Krystyna Suchorska-Tropiło
Department of Vegetable and Medicinal Plants
Warsaw Agricultural University
Nowoursynowska 166, 02-787 Warsaw, Poland
The aim of experiments performed in the years 2000-2001
was to investigate the effect of temperature on the seed germination of
four species: Hypericum hirsutum L., Hypericum polyphyllum L.,
Hypericum xylosteifolium (Spach) N. Robson, and Hypericum erectum L. in
light (24 h) and at a different range of temperatures: 4-6°C, 12-15°C,
20-22°C, and 25-27°C. The objects of study were two-year-old seeds originating from the
experimental field of the Department of Vegetable and Medicinal Plants.
The low temperature delayed germination, but the number of germinated
seeds was the same both at temperature 12-15°C and 20-22°C.
At 25°C the seed germination was significantly lower when
compared with other treatments. Among the investigated seeds the highest
germination capacity was observed in the case of Hypericum
erectum (83% at 20-22°C) and the lowest in Hypericum xylosteifolium (58% at 12-15°C).
Osińska E., Suchorska-Tropiło K., 2002. The effect of temperature on seed
germination of four species of Hypericum genus. Folia Horticulturae 14/2: 163-167.