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. 1973 Apr;51(4):744–748. doi: 10.1104/pp.51.4.744

Diurnal Variations in Photosynthetic Products and Nitrogen Metabolism in Expanding Leaves

Barrie T Steer 1
PMCID: PMC366338  PMID: 16658402

Abstract

Expanding leaves of Capsicum frutescens L. cv. California Wonder, Cucumis melo L. cv. Hales Best, and Citrus sinensis L. Osbeck cv. Washington Navel showed a marked diurnal periodicity in the incorporation of 14C from photosynthetically fixed 14CO2 into amino acids. Incorporation was virtually nil at the beginning of the photoperiod, reached a maximum in the 6th to 7th hour and decreased during the latter part of the photoperiod. In Capsicum frutescens this was apparently a reflection of the availability of reduced nitrogen controlled by the activity of nitrate reductase in the leaves. This also controlled the periodicity of the incorporation of 14C into fraction I protein. Possible control mechanisms and the relation of nitrogen metabolism to the periodicity of leaf expansion growth are discussed.

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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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