Quantitative relationship between indole-3-acetic acid and abscisic acid during leaf growth in Coleus blumei
2002
LaMotte, C. | Li, Xunjing | Jacobs, W. | Epstein, E.
Quantitative determinations by gas chromatography-mass spectrometry of indole-3-acetic acid (IAA) and abscisic acid (ABA) in growing leaves of Coleus blumei plants show parallel declines in leaf concentrations of both hormones, except in leaf number 3 (about three-fourths of full size) where IAA level was the lowest of those measured. Expansion of the most recently unfurled leaf to full size serves, in effect, to dilute both IAA and ABA about 1.7 to 1. Although absolute levels of leaf IAA varied as much as an order of magnitude from one batch of plants to another, ABA levels were proportional to the IAA level with an overall correlation coefficient of 0.91. Evidence, both correlative and causal, for the determination of ABA status by IAA--and of IAA status by ABA--in leaves and other developing organs is summarized.
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