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Effect of nitrogen nutrition on photosynthesis and growth in C 4 Panicum species
Author(s) -
EPO W. D. BOWMAN
Publication year - 1991
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1991.tb01504.x
Subject(s) - panicum , shoot , photosynthesis , botany , biology , malic enzyme , malic acid , biomass (ecology) , nitrogen , c4 photosynthesis , horticulture , enzyme , chemistry , agronomy , food science , biochemistry , dehydrogenase , citric acid , organic chemistry
. The growth and photosynthetic responses to high and low N nutrition were measured in 2 NADP‐malic enzyme and 4 NAD‐malic enzyme C 4 subtype Panicum species to evaluate whether differences in C 4 photosynthetic biochemistry result in differences in the N requirement for growth. All species had lower biomass production, photosynthesis rates, and shoot N concentrations at low N, and no consistent differences between the C 4 subtypes were apparent. The assimilation rates (biomass accumulated over the period of growth) for the NADP‐malic enzyme species were higher than the NAD‐malic enzyme species at high N but not at low N. When assimilation rates were evaluated on a shoot N basis a higher N‐use‐efficiency was found for the NADP‐malic enzyme species at high N. Thus the NADP‐malic enzyme Panicum species had a greater amount of growth for a given shoot N concentration, but only above a certain level of shoot N concentrations.