Quantitative relationship between indole-3-acetic acid and abscisic acid during leaf growth in Coleus blumei |
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Authors: | Clifford LaMotte Xiaoyue Li William Jacobs Ephraim Epstein |
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Institution: | (1) Department of Botany, Iowa State University, Ames, IA, 50011, USA (;(2) Department of Biology, Swarthmore College, Swarthmore, PA 19081, USA;(3) USDA Agricultural Research Service, Beltsville, MD 20705, USA |
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Abstract: | Quantitative determinations by gas chromatography-mass spectrometry ofindole-3-acetic acid (IAA) and abscisic acid (ABA) in growing leaves ofColeusblumei plants show parallel declines in leaf concentrations of bothhormones,except in leaf number 3 (about three-fourths of full size) where IAA level wasthe lowest of those measured. Expansion of the most recently unfurled leaf tofull size serves, in effect, to dilute both IAA and ABA about 1.7 to 1.Althoughabsolute levels of leaf IAA varied as much as an order of magnitude from onebatch of plants to another, ABA levels were proportional to the IAA level withan overall correlation coefficient of 0.91. Evidence, both correlative andcausal, for the determination of ABA status by IAA—and of IAA status byABA—in leaves and other developing organs is summarized. |
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Keywords: | ABA homeostasis Abscisic acid Coleus blumei GC-MS IAA homeostasis Indole-3-acetic acid Leaf growth Solenostemon scutellarioides |
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