Folia Horticulturae

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The effect of environmental factors on seed germination of St. John's Wort (Hypericum perforatum L.)

Krystyna Suchorska-Tropiło, Ewa Osińska

Department of Vegetable and Medicinal Plants
Agricultural University of Lublin
Leszczyńskiego 58, 20-068 Lublin, Poland
e-mail: ogr_krwl@alpha.sggw.waw.pl

The aim of the present investigation was the evaluation of seed germination of St. John's Wort in different conditions of temperature, light, and substrates. The factors of laboratory study were: A - seed origin (‘Topaz’ and population of St. John's Wort), B - thermal conditions (alternating temperature - 10 h in 17°C and 14 h in 25°C, constant temperature 18°C). Both experimental variants were performed in light and in darkness. The factor of pot experiment was a kind of substrate: sphagnum peat, alluvial soil, river sand. The germination rate, expressed by Maguire co-efficient, depended on the thermal and light conditions. The highest co-efficient was obtained in the conditions of alternating temperature and light. Alluvial soil was the best substrate for germination of seeds and weight of seedlings.

Suchorska-Tropiło K., Osińska E., 2003. The effect of environmental factors on seed germination of St. John's Wort (Hypericum perforatum L.). Folia Horticulturae 15/1: 165-171.