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. 1986 Dec;82(4):1161–1163. doi: 10.1104/pp.82.4.1161

Species Variation in the Predawn Inhibition of Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase 1

Jerome C Servaites 1,2,2, Martin A J Parry 1,2, Steven Gutteridge 1,2,3, Alfred J Keys 1,2
PMCID: PMC1056279  PMID: 16665155

Abstract

The activity of ribulose-1,5-bisphosphate carboxylase/oxygenase was measured in extracts of leaves collected before dawn (predawn activity, pa) and at midday (midday activity, ma). Twenty-three of the 37 species examined showed a pa/ma ratio (≤0.75, while only Capsicum frutescens, Cucumis sativa, Glycine max, Nicotiana tabacum, Vigna unguiculata, and 3 Solanum species showed a pa/ma ratio ≤0.5. Phaseolus vulgaris consistently showed a pa/ma ratio of ≤0.1. Activities and pa/ma ratios of the same species grown in the United States and the United Kingdom were very similar. Gel filtration of extracts before assay had no effect on the observed activities and the pa/ma ratios. These data are consistent with the hypothesis that in a number of species the enzyme is partially inhibited following the night period by the presence of a tight-binding inhibitor.

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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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