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Plant Physiology 71:257-262 (1983)
© 1983 American Society of Plant Biologists

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Articles

Metabolism of Tritiated Gibberellins A4 and A9 in Norway Spruce, Picea abies (L.) Karst. 1

Effects of a Cultural Treatment Known to Enhance Flowering

Arne Dunberg2, Gunilla Malmberg2, Takeshi Sassa3 and Richard P. Pharis

Department of Biology, University of Calgary, Calgary, Alberta, T2N 1N4 Canada

Shoots of mature grafted propagules of Picea abies (L.) Karst. metabolized [3H]gibberellin A4 (GA4) to at least 14 acidic substances, two of which were tentatively identified by gas-liquid radiochromatography as GA2 (possibly an artifact) and GA34. [3H]GA9 was converted into a number of metabolites, one of which was chromatographically similar to, but not identical with, GA4. Metabolism was maximally 61 and 57% over 48 hours for GA4 and GA9, respectively, and was correlated with the rate of change (i.e. increase followed by decrease) in endogenous GA-like substances as shoot elongation progressed. Propagules covered with a clear plastic film, a treatment which promotes flowering, metabolized [3H]GA4 more slowly than did control plants in the open. Inasmuch as a GA4/7 mixture can also promote flowering in P. abies, the retarded metabolism of [3H]GA4 may reflect the manner in which trees under plastic metabolize endogenous GA-like substances. If so, then the stimulating effect of this cultural treatment on flowering may come about through an increased level of endogenous, less polar GA-like substances.

2 Permanent address: Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, S-901 83 Umeå, Sweden. Present address: Department of Plant Physiology, Umeå University, S-901 87 Umeå, Sweden.

3 Present address: Department of Agricultural Chemistry, Yamagata University, Tsuoroka, Yamagata 997, Japan.

1 This work was supported by the Swedish Council for Forestry and Agricultural Research Grant P200 to A.D., and National Research Council of Canada Grant A-2585 and Canadian Forestry Service Extramural Grant to R. P. P.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1983 by the American Society of Plant Biologists