Gibberellins from the Tassel, Cob, ‘Seed,’ Silk, and Pollen of Maize
The endogenous gibberellins (GAs) of maize have been extensively studied by Phinney and his co-workers.1–4 These investigations were based on the use of single-gene dwarf mutants that control specific steps in the GA biosynthetic pathway for maize. The studies provided definitive data for the identification of the native GAs present in the vegetative tissues as well as information on the biosynthetic pathway for these GAs. The control points in the pathway were also defined for each of the mutants d1, d2, d3, and d5, thus providing a biochemical basis for the expression of each mutant. The studies in maize focused on the control of shoot elongation, with vegetative tissues as the experimental material. The purpose of this report is to present evidence for the presence of GAs in maize cell and tissue regions associated with reproduction—the young “seed” (fruit), the embryo, the cob (the female inflorescence), the tassel (the male inflorescence), the silk, and pollen.
KeywordsVegetative Tissue Vegetative Shoot Dwarf Mutant Female Inflorescence Normal Maize
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