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Articles

Identification of Plant Hormones from Cotton Ovules ¹

^a Department of Plant Sciences, University of California, Riverside, California 92502

An extract from 8-day-old cotton ovules (Gossypium hirsutum L.) was partitioned into three fractions and each fraction was derivatized and analyzed separately. Gas-liquid chromatography and computer-controlled gas-liquid chromatography-mass spectrometry were used to separate, measure, and identify the naturally occurring plant hormones. A single extract contained abscisic acid, indoleacetic acid, and gibberellins A₁, A₃, A₄, A₇, A₉, and A₁₃ in the first fraction; ethyl indole-3-acetate and indole-3-aldehyde in the second fraction; and the cytokinins 6-(3-methyl-4-hydroxybutylamino)purine (dihydrozeatin), 6-(4-hydroxy-3-methyl-2-trans-butenylamino) purine (zeatin), 6-(3-methyl-2-butenylamino)purine(2iP), 6-(3-methyl-2-butenylamino)-9--D-ribofuranosylpurine(2iPA), and 6-(4-hydroxy-3-methyl-2-trans-butenylamino)-9--D- ribofuranosylpurine (zeatin riboside) in the third fraction.

³ Present address: Department of Horticulture, Washington State University, Pullman, Wash.

¹ Research was supported by a Grant 116-15-18 from the Cooperative States Research Service, United States Department of Agriculture.

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