ISHS Acta Horticulturae 162: Symposium on CO2 Enrichment
THE EFFECT OF CO2, DAYLENGTH AND LIGHT ON THE PRODUCTION AND SUBSEQUENT GROWTH OF BEGONIA X TUBERHYBRIDA CUTTINGS |
| Author: | R. Djurhuus |
| Abstract:
Stock plants of Begonia x tuberhybrida 'Karelsk Jomfru' were subjected to various CO2 regimes and to different daylength and light intensities. The experiment was carried out in growth rooms at 19°C. The plants were grown at two CO2 levels, either 330 or 1100 μl l-1 and irradiated with either 7 or 15 Wm-2. One half of the plants were grown at 10 h (SD) and the other half at 24 h (LD) photoperiod. Yield of cuttings and the after-effects of stock plant treatments on lateral shoot formation and growth of cuttings were studied. Carbon dioxide enrichment of the stock plants strongly enhanced number of cuttings (23 %). The effect of CO2 was promoted by LD treatment. At LD the stock plants produced 41 % more cuttings compared with SD. Number of cuttings were also enhanced by increasing irradiation level (23 %). Long days to stock plants had a positive after-effect on growth and lateral shoot formation of rooted cuttings. CO2 enrichment of stock plants had no after-effects. Rooted cuttings from stock plants grown at 7 Wm-2 produced significantly more lateral shoots than cuttings from 15 Wm-2. Abbreviations: LD = long photoperiod, SD = short photoperiod. | |
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