Plant Physiol. Drug Metab Dispos
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Plant Physiology 65:13-16 (1980)
© 1980 American Society of Plant Biologists

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Articles

Stimulation of Endomitotic DNA Synthesis and Cell Elongation by Gibberellic Acid in Epicotyls Grown from Gamma-irradiated Pea Seeds 1

Alfons Callebaut, Patrick Van Oostveldt and Roger Van Parijs

Laboratorium voor Biochemie, Fakulteit van de Landbouwwetenschappen-RUG, Coupure Links 533, B 9000 Gent, Belgium

Large doses of {gamma}-irradiation, given to air-dried pea seeds, inhibit the endomitotic DNA synthesis in pea epicotyls during germination in darkness. The cortex cells of the etiolated epicotyls reach only the 4 C DNA level, whereas cortex cells of unirradiated seeds reach the 8 C DNA level. Epicotyl elongation and cell elongation are also reduced.

Application of gibberellic acid restores the endomitotic DNA synthesis and the cell elongation in epicotyls of irradiated seeds. The cortex cells reach again the 8 C DNA level in darkness.

The results suggest that {gamma}-irradiation blocks endomitotic DNA synthesis and cell elongation by lowering the concentration of endogenous gibberellins.

1 This work was supported by Instituut voor Aanmoediging van Wetenschappelijk Onderzoek in Nijverheid en Landbouw (I.W.O.N.L.). P.V.O. was supported by a personal grant from Nationaal Fonds voor Wetenschappelijk Onderzoek (N.F.W.O.).






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Copyright © 1980 by the American Society of Plant Biologists