Progress No. 9 Cultivar of Pea Has Alternative Respiratory Capacity and Normal Glycine Metabolism

概要

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Mitochondria from the dwarf pea cultivar Progress No. 9, have been reported to lack alter-native respiration. However, the rates of respiration with succinate and malate by mitochondria isolated from Progress No. 9, although approximately 30% lower than those from Alaska, had the same percentage distribution of respiratory capacity between the cytochrome pathway and the alternative pathway. Immunoblots showed both cultivars contain polypeptides identified as components of the alternative oxidase. Both cultivars formed identical products during photosynthetic <14>^CO_2 fixation, and the percentage distribution of <14>^C into glycine and serine were similar. In spite of large amounts of glycine decarboxylase in the isolated leaf mitochondria, rates of O_2 uptake with glycine were similar to rates with malate or succinate. It appears that glycine oxidation was coupled to the alternative oxidase to the same extent as malate and succinate oxidation, and the alternative oxidase was not specifically utilized for glycine oxidation.
日本植物生理学会の論文