ISHS Acta Horticulturae 393: Environmental Effects and their Control in Plant Tissue Culture
EFFECTS OF LIGHTING CYCLE ON DAILY CO2 EXCHANGE AND DRY WEIGHT INCREASE OF POTATO PLANTLETS CULTURED IN VITRO PHOTOAUTOTROPHICALLY |
| Authors: | M. Hayashi, K. Fujiwara, T. Kozai, M. Tateno, Y. Kitaya |
| Keywords: | daily CO2 exchange, dry weight increase, lighting cycle, micropropagation, photoautotrophic growth, potato |
| Abstract:
Leafy single node cuttings of potato plantlets were cultured in vitro photoautotrophically with four lighting cycle treatments (16 h photoperiod/8 h dark period, 4 h photoperiod/2 h dark period, 1 h photoperiod/0.5 h dark period and 0.25 h photoperiod/0.125 h dark period). The ratio of the photoperiod to the dark period was 2 in all the treatments. Therefore, the electricity consumption for lighting per day was the same in all the treatments. The daily CO2 exchange per plantlet and dry weight increase of the potato plantlets were greater in the shorter lighting cycle treatments than in the longer lighting cycle treatments. Time courses of the difference in CO2 concentration between inside and outside the vessel were different from each other among the treatments. The differences in the daily CO2 exchange per plantlet and dry weight increase of the potato plantlets among the treatments was explained in terms of the time courses of the differences in CO2 concentrations in the vessels among the treatments. | |
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