A RELATIONSHIP BETWEEN PHOTOPERIODISM AND RESPIRATION

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Abstract
Leaf samples obtained from plants grown under long-day, night interruption and short-day photoperiods were examined for their respiratory activities (Q02) immediately after treatment. Short-day plants, Biloxi soybean and cocklebur, exhibited increased respiration rates after photo-inducing daylengths. Wintex barley, a long-day plant, possessed decreased respiratory rates when subjected to the photo-inducing light treatments, i.e., long-day and night interruption. The indeterminate plants, tomato and Alaska pea, exhibited increased respiratory rates with the long day treatments and no change with night interruption treatment. A correlation was shown to exist between respiration rate and the flowering response of the photoperiod-sensitive plants investigated. In each case the extent of the shift in respiratory activity was correlated with the number of flowers ultimately produced by the photo-periodic treatment.