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Relationship between leaf nitrogen and photosynthetic rate for three NAD-ME and three NADP-ME C₄ grasses¹

⁰ Department of Ecology and Evolution, State University of New York, Stony Brook, New York 11794 USA

ABSTRACT

Theoretical considerations have suggested that there may be differences in photosynthetic nitrogen use efficiency (PNUE) among plants that use different biochemical variants of C₄ photosynthesis. To test this hypothesis we examined the leaf nitrogen content and photosynthetic rates of six grass species (three of C₄ subtype NAD-ME and three of C₄ subtype NADP-ME) grown over a wide range of nitrogen supply. While there were significant differences among the species in various traits, there were no consistent differences between the C₄ subtypes in either leaf nitrogen content at a given level of nitrogen supply or in the leaf nitrogen-photosynthesis relationship. We suggest that species-level variation in photosynthetic nitrogen use efficiency among C₄ species is large enough to mask any differences that may be due to C₄ subtype.

Key Words: C₄ photosynthesis • grasses • leaf nitrogen • NAD-ME photosynthesis • NADP-ME photosynthesis • nitrogen use efficiency • photosynthetic nitrogen use efficiency • Poaceae

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