Cardinal Temperatures of Germination in Medicinal Pumpkin (Cucurbita
pepo convar. pepo var. styriaca), Borago (Borago
officinalis L.) and Black Cumin (Nigella sativa L.)
Abstract:
The purpose of this study was to determine cardinal
temperatures of germination in three medicinal plants include medicinal
pumpkin, borago and black cumin. Wide ranges of temperatures (5, 10, 15,
20, 25, 30, 35, 40 and 45°C) were used. A segmented regression model
was used to determine base (Tb,), optimum (T0) and
ceiling, (Tc) temperatures for germination. Tb was
estimated as 5.9°C for medicinal pumpkin, 5°C for borago and 5°C
for black cumin. T0 was estimated as 37.7°C for medicinal
pumpkin, 29.9°C for borago and 28.6°C for black cumin and Tc
was estimated 45°C for medicinal pumpkin, 39.9°C for borago and
35°C for black cumin. This information can be used in evaluation of
new areas suitable for introduction of these species and optimization
sowing management. In addition, it can be used to develop management models
for prediction of timing of crop developmental processes.
F. A. Ghaderi, A. Soltani and H.R . Sadeghipour, 2008. Cardinal Temperatures of Germination in Medicinal Pumpkin (Cucurbita
pepo convar. pepo var. styriaca), Borago (Borago
officinalis L.) and Black Cumin (Nigella sativa L.). Asian Journal of Plant Sciences, 7: 574-578.
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