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Development and Growth Regulation

The Distribution of Gibberellins in Vegetative Tissues of Pisum sativum L. ¹

I. Biological and Biochemical Consequences of the le Mutation

School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom, Department of Plant Science, University of Tasmania, Hobart, 7001 Australia

The concentrations of endogenous gibberellin (GA) 1, 5, 8, 19, 20, and 29 in the component tissues of maturing tall (Le) and dwarf (le) pea (Pisum sativum) plants have been determined. The following conclusions were drawn from the data obtained: (a) GA₂₀ and its metabolites accumulate only in the growing regions of Le and le plants; (b) the le mutation is biochemically expressed in all immature tissues of the dwarf plants; (c) the quantitative composition of the GA metabolites in the various immature tissues is variable; (d) the total GA concentration in apical buds, unexpanded leaves, and tendrils is considerably higher than in GA₁-responsive stem tissue; and (e) there is very little GA accumulation of the inactive 2-hydroxylated GAs (GA₈ and GA₂₉) in either the mature vegetative tissues or the roots of pea plants.

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