Mitochondrial Respiration and Hemoglobin Gene Expression in Barley Aleurone Tissue | Zendy

Xianzhou Nie | Zendy; Robert D. Hill | Zendy

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Mitochondrial Respiration and Hemoglobin Gene Expression in Barley Aleurone Tissue

Author(s) -

Xianzhou Nie,

Robert D. Hill

Publication year - 1997

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.114.3.835

Subject(s) - oligomycin , aleurone , hordeum vulgare , oxidative phosphorylation , biology , gene expression , biochemistry , respiration , antimycin a , gene , messenger rna , mitochondrion , botany , enzyme , atpase , poaceae

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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