1. The photoperiodic responses of a short-day plant,
Salvinia natans, were studied by supplying with the organic acids of citric acid cycle. The acids used were citric, succinic, fumaric and malic acids, added to the culture solution only during the dark period.
2. The developments of the sporocarps were inhibited by the citric acid of all Nov.-Dec. 1959 Bot. Mag. Tokyo, Vol. 72, Nos. 857-858 465 the concentrations tested, while in succinic, fumaric or malic acid of lower concentrations their developments were more or less accelerated, especially by the succinic acid.
3. The inhibiting effect of citric acid on the photoperiodic induction was not found when the other acids were also used at the same time.
These facts seem to suggest that the effect of citric acid on a process of the photoperiodic induction was antagonistic with that of the others, though all the acids used were available as the substitutes of carbohydrate required for the development of the sporocarps.
4. The malonic acid combined with the acids other than citric acid made some decreases in the photoinductive effect, whereas it was notably increased when the former acid was used alone. In citric acid, however, no such decreases were observed.
5. These facts seem to indicate that a relative quantity of the organic acids in the plants may be an important factor for an alternation from the vegetative to the reproductive phase.
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