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Effects of the lighting cycle on the growth and morphology of potato plantlets in vitro under photomixotrophic culture conditions



Effects of the lighting cycle on the growth and morphology of potato plantlets in vitro under photomixotrophic culture conditions



Environment Control in Biology 31(3): 169-175



The leafy single node cuttings of potato (Solanum tuberosum L. cv. Benimaru) plantlets cultured in vitro were cultured under photomixotrophic conditions, and the effect of the lighting cycle on the growth and morphology of the plantlets into which the cuttings in vitro was examined under the following four lighting cycle treatments: (1) 16 hr photoperiod/8 hr dark period; (2) 4 hr photoperiod/2 hr dark period; (3) 1 hr photoperiod/0.5 hr dark period; and (4) 0.25 hr photoperiod/0.125 hr dark period. The ratio of the photoperiod to the dark period was 2:1 in all treatments. Therefore, the amount of electricity for lighting per day was the same in all the treatments. The CO-2 concentrations inside and outside the vessels were measured at time intervals of 0.0625-2.5 hr. On day 28, the dry fresh weights per plantlet were greater in the shorter lighting cycle treatments than in the longer lighting cycle treatments. However, the length of the newly developed shoots of the plantlets was the shortest, and the leaf dry weight and leaf area per plantlet were the greatest in the 1 hr photoperiod/0.5 hr dark period treatment. The difference in CO-2 concentration between the inside and outside of the vessel, DELTA-C, during the photoperiod increased with the passage of days after treatments and was greater in the longer lighting cycle treatments than in the shorter lighting cycle treatments. The AC during the photoperiod showed a low constant value for a longer time in the longer lighting cycle treatments than in the shorter lighting cycle treatments. The differences in growth of the potato plantlets among the treatments seemed to be primarily influenced by the differences in CO-2 concentrations in the vessels among the treatments.

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