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By planned and prepared under the direction of Carroll E. Wood, Jr., assisted by Elizabeth A. Shaw ; with the technical help of Karen S. Velmure and Kenneth R. Robertson.

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Extra info for A student's atlas of flowering plants : some dicotyledons of eastern North America

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The movement continues in a constant environment in flowers that have been detached from the plant and mounted separately in holders containing a sugar solution. Opening and closing of the flowers can be followed automatically by measuring the changes in the intensity of a light beam directed downward over the flowers (Engelmann et al, 1974). Using this technique, the phase-shifting by light pulses has been studied in detail. Red light at 660 nm is most effective (Fig. 6), probably via phytochrome as photoreceptor.

In the absence of daily light-dark cycles, the leaflets of these legumes continue to show sleep movements just as bean leaves do. Samanea and Albizzia are particularly nice to work with because their leaves and pulvini are large and compound, allowing paired replicates from the same leaf (Fig. 3). It is possible to measure leaf movements with only the pulvinus and a bit of the petiole, the end of which is dipped into a sugar solution (Simon et al, 1976a). In darkness, the move­ ments die out rather quickly unless sugar is fed through the petiole.

A circa­ dian rhythm in photosynthesis has been demonstrated in P. fusiformis, and the nonbioluminescent species, Ceratiumfurca and Glenodinium sp. Maxima in oxygen evolution or carbon dioxide uptake in light are found in the middle of the day, rather than at night like bioluminescence. The pattern repeats with a circadian period when the cells are in continuous light. As in Gonyaulax, cell division in a number of other dinoflagellates takes place during the night, the subjective night if the cells are in LL.

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