Germination responses of four wild species to diurnal increase or decrease in temperature
Seedling emergence in a single growth season from the seed bank and the effect of a daily gradual increase or decrease in temperature on germination of four wild species, viz. C. virgata, H. grandiflora, E. crusgalli and C. divaricatum were evaluated. We hypothesized that seeds germinated more in spring than in autumn in the study area and the diurnal increase or decrease in temperature played a critical role in controlling germination timing. Four ranges of temperature (5-10, 10-15, 15-20 and 20-25°C) were used and there were two opposite schemes in each range, with one increasing temperature by 0.5°C every day, the other decreasing temperature by 0.5°C every day. Seedling emergence in May and June was significantly higher than in September and October. Three species showed significant differences in germination between diurnal increased and decreased temperature in the ranges 5-10 and 10-15°C, with the exception of C. divaricatum. Diurnal increase in temperature promoted germination. At the optimum temperature range for germination (15-20 and 20-25°C), this response of seeds to daily increased temperature was not observed. This study has revealed the adaptive strategy of these species to diurnal increased temperature in spring and the diurnal decreased temperature in autumn.
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Document Type: Research Article
Publication date: July 1, 2007
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