Differential Expression of Alternative Oxidase Genes in Soybean Cotyledons during Postgerminative Development | Zendy

T. C. McCabe | Zendy; Patrick M. Finnegan | Zendy; A. Harvey Millar | Zendy; David A. Day | Zendy; James Whelan | Zendy

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Differential Expression of Alternative Oxidase Genes in Soybean Cotyledons during Postgerminative Development

Author(s) -

T. C. McCabe,

Patrick M. Finnegan,

A. Harvey Millar,

David A. Day,

James Whelan

Publication year - 1998

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.118.2.675

Subject(s) - alternative oxidase , cotyledon , glycine , gene expression , biology , gene , biochemistry , oxidase test , microbiology and biotechnology , botany , enzyme , amino acid

The expression of the alternative oxidase (AOX) was investigated during cotyledon development in soybean (Glycine max [L.] Merr.) seedlings. The total amount of AOX protein increased throughout development, not just in earlier stages as previously thought, and was correlated with the increase in capacity of the alternative pathway. Each AOX isoform (AOX1, AOX2, and AOX3) showed a different developmental trend in mRNA abundance, such that the increase in AOX protein and capacity appears to involve a shift in gene expression fromAOX2 to AOX3. As the cotyledons aged, the size of the mitochondrial ubiquinone pool decreased. We discuss how this and other factors may affect the alternative pathway activity that results from the developmental regulation of AOX expression.

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