GIBBERELLIN AND RETARDANTS INFLUENCE ON SOME ORNAMENTAL PLANTS AND A LEVEL OF THEIR NATIVE GROWTH SUBSTANCES

Grown in the field condition pink, phlox, sneezeweed /Helenium sp./ plants were treated on the 1–2 of June with gibberellin /GA₃, 125 ppm/, kamposan /KM, 5000, 1000, 500, 250 ppm/, chlorcholinchlorid /CCC, 10000 ppm/ alone and together.
GA₃ induced stem elongation and the beginning of plant flowering.
In contrast to GA₃, CCC and KM decreased stem length and retarded the development of inflorescences especially markedly at high concentrations of KM: by the end of the season the flower number was equal to or more than that in untreated plants in the CCC-case, but less in KM variant.
GA₃ completely overcome CCC-induced effects, but failed to do it in the KM-case.
The native growth substances were studied in liophylized material after extracting it with 70% methanol or ethanol and separating it on the paper chromatograms.

The elevated activity of auxin – like compounds in leaves as determined by bioassay of wheat coleoptile sections was observed after GA₃ – treatment and to much greater extent after KM treatment.
CCC decreased the auxin level in apices, but not in the leaves.
The content of chlorogenic acid was increasing during 2 days after GA₃ treatment and then lowered rapidly.
CCC significantly increased the level of chlorogenic acid in stems but decreased it in leaves.

Symposium on Growth Regulators in Floriculture

L.V. Rounkova

https://doi.org/10.17660/ActaHortic.1979.91.53