Quantitative relationship between indole-3-acetic acid and abscisic acid during leaf growth in Coleus blumei
Plant Growth Regulation(2002)
摘要
Quantitative determinations by gas chromatography-mass spectrometry ofindole-3-acetic acid (IAA) and abscisic acid (ABA) in growing leaves of Coleusblumei 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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关键词
ABA homeostasis,Abscisic acid,Coleus blumei,GC-MS,IAA homeostasis,Indole-3-acetic acid,Leaf growth,Solenostemon scutellarioides
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