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PLANT PHYSIOLOGY , Vol 114, Issue 3 835-840, Copyright © 1997 by American Society of Plant Biologists
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GENE REGULATION AND MOLECULAR GENETICS |
Mitochondrial Respiration and Hemoglobin Gene Expression in Barley Aleurone Tissue
X. Nie and R. D. Hill
Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
Previous studies have shown that plant hemoglobin (Hb) mRNA is expressed in
barley (Hordeum vulgare L.) aleurone layers during hypoxia. We have
examined the effect of a number of respiratory inhibitors on barley
aleurone layers to determine the factors that influence Hb gene expression.
Respiratory inhibitors that reduce O2 consumption, such as CO, cyanide, and
antimycin A, strongly enhanced Hb mRNA levels. Treatment with the oxidative
phosphorylation uncoupler 2,4-dinitrophenol markedly increased O2
consumption and had a similar positive effect on Hb gene expression. Hb
transcript levels were also stimulated by the ATP synthase inhibitor
oligomycin. The results suggest that the expression of Hb is not directly
influenced by O2 usage or availability but is influenced by the
availability of ATP in the tissue.
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