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PLANT PHYSIOLOGY , Vol 114, Issue 3 835-840, Copyright © 1997 by American Society of Plant Biologists

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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