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Annals of Botany 37: 605-614, 1973
© 1973 Annals of Botany Company

RESEARCH-ARTICLE

The Negative Response of Photoperiodic Floral Induction in Chenopodium rubrum L. to Preceding Growth

F. SEIDLOVÁ and J. KREKULE

Institute of Experimental Botany, Czechoslovak Academy of Sciences Prague, Czechoslovakia

Received: 17 July 1972   

In Chenopodium rubrum there exists a correlation between the age of the seedlings and the effectiveness of photoperiodic induction. The younger the plants the more effective was photoperiodic treatment. In three-day-old seedlings one short day was sufficient to promote incomplete flowering, while two short days brought about 100 per cent flowering. With six-, eight-, and ten-day-old plants exposed to two or three short days quantitative differences were observed in the earliness of flowering and the percentage of flowering plants. The effects of continuous light and of short days with a light break preceding the inductive treatment were compared. The results obtained indicate that the inhibitory effect of plant age cannot be attributed solely to the appearance of inhibitors under continuous light but changes of growth pattern in plants of different age should also be taken into consideration.

The inhibition of RNA synthesis in shoot apices brought about by 6-azauridine resulted also in a flowering stimulation, provided that the inhibitor was applied one or two days prior to induction and the inductive process itself remained undisturbed. This stimulation was accompanied by inhibition of vegetative growth and by a decrease of RNA concentration in the cytoplasm as estimated cytophotometrically.

The competition between growth of vegetative organs and floral differentiation affects the response to inductive treatment. The suppression of growth can result in enhancement of flowering.


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