ISHS Acta Horticulturae 589: X International Asparagus Symposium
PREGERMINATION AND GERMINATION IN ASPARAGUS |
| Authors: | P. Cermeño, L.A. del Olmo, J. Belda, M. Corell |
| Keywords: | temperarature, substrate, maturity, seed, fruit. |
| Abstract:
This paper presents the results of different tests aimed at improving the pregermination and germination conditions of Asparagus officinalis L. In order to control the process and forecast the results of the germination phase of asparagus, it is necessary to know the operating parameters and their influence. Using environmental control chambers, the germination response to different pregermination treatments (7 days at 5°C, 24 hours at 25°C, 0.2% KNO3, gibberellic acid -GA3- 100 p.p.m. and 500 p.p.m.), different temperatures (5, 10, 15, 20, 25, 30, 35°C and temperature cycles between 20°C (12 hours) and 30°C (12 hours), different substrates (between paper (BP), osmosis water, top paper (TP), top sand (TS) and top peat (TPT)) and different maturity state of seeds (green fruit, 25% red, 50% red and 100% red) have been studied. The germination speed and the proportion of seeds germinated were monitored and recorded. The most favorable temperature conditions overall were the 20-30°C (12h-12h) cycle, and 30°C was also the most favorable along the constant temperature conditions. The best substrate was sand. Accordingly as the green fruit changes colour, the seeds acquire the capacity to germinate. When the proportion of red colour is greater than the green all the seeds had developed to be germinable. | |
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