ISHS Acta Horticulturae 362: International Symposium on Agrotechnics and Storage of Vegetable and Ornamental Seeds
TEMPERATURE, WASHING OF "SEEDS", LIGHT AND HIGH TEMPERATURE DURATION ON GERMINATION RATE OF FLORENCE FENNEL "SEEDS" |
| Authors: | G. Damato, R.J. Downs, S. Vannella |
| Keywords: | Florence fennel, temperature, washing, light, “seed” maturation, Weibull function |
| Abstract:
Washed and not washed "seeds" of Florence fennel (Foeniculum vulgare Mill. var. azoricum Tell.) were germinated at constant day and night temperatures of 15, 20, 25, 30 and 35°C or at alternanting temperature of 25/15 and 30/20°C, in the light and in the dark or continuosly in the dark. Germination at 30°C was 64%, no germination occurred at 35°C, while germination was similar at other temperature (81%). The speed of germination was greatest at 25 and 30/20°C. Washing and light improved germination slightly. In another experiment mature seeds harvested on two successive occasions were tested at high temperature (35°C) for duration of 120, 96, 72, 48, 24, 18, 12, 6 and 0 h. Germiation percentage of early-matured "seed" was higher than those of the later maturity and T50 was shorter compared to the control when high temperature durations was longer than 18 h. | |
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