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Link to original content: https://doi.org/10.1007/BF00194457
Regulation of photosynthetic carbon assimilation in leaves of C3–C4 intermediate species of Moricandia and Flaveria | Planta Skip to main content
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Regulation of photosynthetic carbon assimilation in leaves of C3–C4 intermediate species of Moricandia and Flaveria

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Abstract

The relationship between the gas-exchange characteristics, the contents of photosynthetic intermediates and the quantum yield of photosystem II was examined at different intercellular partial pressures of CO2 (p i) in attached leaves of Moricandia arvensis L. (D.C.) and Flaveria floridana J.R. Johnson (both C3–C4 intermediate plants) and, for comparison, in F. pringlei Gandoger (a C3 plant) and in F. bidentis (a C4 plant). Both C3–C4 intermediate species had pools of phosphoenolpyruvate, pyruvate, alanine and aspartate intermediate to those of the C3 and C4 species examined. Moricandia arvensis had large pools of glycine at low p i, consistent with the operation of a glycine shuttle from mesophyll to bundle-sheath cells. It also had a high pool of triose-phosphate at ambient partial pressures of CO2, indicating that a glycerate-3-phosphate/triose-phosphate shuttle could operate in this species. This was not the case in F. floridana. A decline in the ribulose-1,5-bisphosphate and triose-phosphate pool in M. arvensis, and a rise in the pools of glycerate-3-phosphate and pyruvate in F. floridana, at low p i, show different patterns of metabolic regulation in M. arvensis and F. floridana at low p i in comparison to C3 and C4 plants.

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Abbreviations

Frul,6bisP:

fructose-1,6-bisphosphate

PEP:

phosphoenolpyruvate PGA-glycerate-3-phosphate

p i :

intercelular CO2 pressure

PPFD:

photosynthetic photon flux density;

RuBP:

ribulose-1,5-bisphosphate

triose-P:

triose phosphates

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Author notes

  1. Richard C. Leegood

    Present address: Robert Hill Institute and Department of Animal and Plant Sciences, University of Sheffield, S102TN, Sheffield, UK

Authors and Affiliations

  1. Plant Environmental Biology Group, Research School of Biological Sciences, Australian National University, P.O. Box 475, 2601, Canberra, A.C.T., Australia

    Richard C. Leegood & Susanne von Caemmerer

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  1. Richard C. Leegood
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  2. Susanne von Caemmerer
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Additional information

This work was done while R.C.L. was a Visiting Fellow at the Australian National University, and was sponsored by the Royal Society. We are grateful to Kathy Britt for assistance with the analysis of amino acids.

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Leegood, R.C., von Caemmerer, S. Regulation of photosynthetic carbon assimilation in leaves of C3–C4 intermediate species of Moricandia and Flaveria . Planta 192, 232–238 (1994). https://doi.org/10.1007/BF00194457

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