Folia Horticulturae

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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
e-mail: ogr_krwl@alpha.sggw.waw.pl

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.