ISHS Acta Horticulturae 167: II Symposium on Growth Regulators in Floriculture
MULTIPLE SITES OF AUXIN ACTION IN FLOWERING OF LONG DAY AND SHORT DAY CHENOPODIUM |
| Authors: | J. Krekule, L. Pavlová, D. Soucková |
| Abstract:
The inhibition of flowering by exogenous IAA was observed in both short day plant Chenopodium rubrum and long day plant Chenopodium murale. IAA /3.10-4M/ was applied to the leaves or to the apices of Ch. rubrum at different times during endogenous rhythm of flowering. The response to IAA was highest before or in the course of ascending phase of the rhythm. It is assumed that IAA affects processes of photo-periodic induction taking place in receptive organs. IAA was applied on different days of induction by continuous light in Ch. murale. Marked inhibition of flowering was found at the beginning of induction and less before its end. The results from previous experiments pointing to a direct inhibitory effect of IAA in stem apical meristem of Ch. rubrum are also quoted. Thus, the existence of multiple sites of IAA effects in flowering was demonstrated. The possible relationship between the responsiveness to applied auxin and the fluctuation of the endogenous level of free IAA is discussed. | |
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