EFFECTS OF LIGHTING CYCLE ON DAILY CO₂ EXCHANGE AND DRY WEIGHT INCREASE OF POTATO PLANTLETS CULTURED IN VITRO PHOTOAUTOTROPHICALLY

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.

Environmental Effects and their Control in Plant Tissue Culture

M. Hayashi, K. Fujiwara, T. Kozai, M. Tateno, Y. Kitaya

daily CO₂ exchange, dry weight increase, lighting cycle, micropropagation, photoautotrophic growth, potato

https://doi.org/10.17660/ActaHortic.1995.393.25