Abstract
Evidence that gibberellin Al(GAO is the primary gibberellin controlling internode elongation in Pisum sativum is compelling. Ingram et al. (1984, 1986) demonstrated that the le mutation causes a dwarf phenotype because it partially blocks the conversion of GA20to GA,. Applied GA20has little effect on internode elongation in the le dwarf, whereas applied GA, can restore a normal phenotype. Subsequent work using a different allele of the le locus (led) showed that a greater block in the conversion of GA20to GA1 resulted in more severe dwarfism (Ross et al. 1989). Thus, in the allelic series Le le led internode elongation is directly proportional to the level of GA1, and GA20has no activity per se.
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