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. 1972 Jan;49(1):28–32. doi: 10.1104/pp.49.1.28

Developmental Studies on Microbodies in Wheat Leaves 1

I. Conditions Influencing Enzyme Development

J Feierabend a,2, Harry Beevers a
PMCID: PMC365896  PMID: 16657892

Abstract

Catalase, glycolate oxidase, and hydroxypyruvate reductase, enzymes which are located in the microbodies of leaves, show different developmental patterns in the shoots of wheat seedlings. Catalase and hydroxypyruvate reductase are already present in the shoots of ungerminated seeds. Glycolate oxidase appears later. All three enzymes develop in the dark, but glycolate oxidase and hydroxypyruvate reductase have only low activities. On exposure of the seedlings to continuous white light (14.8 × 103 ergs cm−2 sec−1), the activity of catalase is doubled, and glycolate oxidase and hydroxypyruvate reductase activities increase by 4- to 7-fold. Under a higher light intensity, the activities of all three enzymes are considerably further increased. The activities of other enzymes (cytochrome oxidase, fumarase, glucose-6-phosphate dehydrogenase) are unchanged or only slightly influenced by light. After transfer of etiolated seedlings to white light, the induced increase of total catalase activity shows a much longer lag-phase than that of glycolate oxidase and hydroxypyruvate reductase. It is concluded that the light-induced increases of the microbody enzymes are due to enzyme synthesis. The light effect on the microbody enzymes is independent of chlorophyll formation or the concomitant development of functional chloroplasts. Short repeated light exposures which do not lead to greening are very effective. High activities of glycolate oxidase and hydroxypyruvate reductase develop in the presence of 3-amino-1,2,4-triazole which blocks chloroplast development. The effect of light is not exerted through induced glycolate formation and appears instead to be photomorphogenetic in character.

In senescing leaves excised from the plants decreases in activity of glycolate oxidase, and hydroxypyruvate reductase follow with some delay the decrease in chlorophyll content. The activity of catalase, however, is maintained at high levels, especially when the detached shoots are kept in light.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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