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PLANT PHYSIOLOGY , Vol 102, Issue 2 379-386, Copyright © 1993 by American Society of Plant Biologists
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METABOLISM AND ENZYMOLOGY |
Metabolism and Biological Activity of Gibberellin A4 in Vegetative Shoots of Zea mays, Oryza sativa, and Arabidopsis thaliana
M. Kobayashi, P. Gaskin, C. R. Spray, Y. Suzuki, B. O. Phinney and J. MacMillan
Department of Biology, University of California, Los Angeles, California 90024-1606 (M.K., C.R.S., Y.S., B.O.P.)
[17-13C,3H]Gibberellin A4 (GA4) was injected into the shoots of tall
(W23/L317), dwarf-1 (d1), and dwarf-5 (d5) Zea mays L. (maize); tall (cv
Nipponbare), dwarf-x (dx), and dwarf-y (dy) Oryza sativa L. (rice); and
tall (ecotype Landsberg erecta), ga4, and ga5 Arabidopsis thaliana (L.)
Heynh. [13C]GA4 and its metabolites were identified from the shoots by
full-scan gas chromatography-mass spectrometry and Kovats retention
indices. GA4 was metabolized to GA1 in all nine genotypes. GA4 was also
metabolized in some of the genotypes to 3-epi-GA1, GA2, 2[beta]-OH-GA2,
3-epi-GA2, endo-GA4, 16[alpha], 17-H2-16, 17-(OH)2-GA4, GA34, endo-GA34,
GA58, 15-epi-GA63, GA71, and 16-epi-GA82. No evidence was found for the
metabolism of GA4 to GA7 or of GA4 to GA3. The bioactivities of GA4 and GA1
were determined using the six dwarf mutants for assay. GA4 and GA1 had
similar activities for the maize and rice mutants. For the Arabidopsis
mutants, GA4 was more active than GA1 at low dosages; GA4 was less active
than GA1 at higher dosages.
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