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Estimating the Excess Investment in Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase in Leaves of Spring Wheat Grown under Elevated CO21

Julian C. Theobald, Rowan A.C. Mitchell*, Martin A.J. Parry, and David W. Lawlor

Biochemistry and Physiology Department, Institute of Arable Crops Research-Rothamsted, Harpenden, Hertfordshire, AL5 2JQ, United Kingdom

Wheat (Triticum aestivum L.) was grown under CO2 partial pressures of 36 and 70 Pa with two N-application regimes. Responses of photosynthesis to varying CO2 partial pressure were fitted to estimate the maximal carboxylation rate and the nonphotorespiratory respiration rate in flag and preceding leaves. The maximal carboxylation rate was proportional to ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) content, and the light-saturated photosynthetic rate at 70 Pa CO2 was proportional to the thylakoid ATP-synthase content. Potential photosynthetic rates at 70 Pa CO2 were calculated and compared with the observed values to estimate excess investment in Rubisco. The excess was greater in leaves grown with high N application than in those grown with low N application and declined as the leaves senesced. The fraction of Rubisco that was estimated to be in excess was strongly dependent on leaf N content, increasing from approximately 5% in leaves with 1 g N m-2 to approximately 40% in leaves with 2 g N m-2. Growth at elevated CO2 usually decreased the excess somewhat but only as a consequence of a general reduction in leaf N, since relationships between the amount of components and N content were unaffected by CO2. We conclude that there is scope for improving the N-use efficiency of C3 crop species under elevated CO2 conditions.

1   J.C.T. was supported by a grant from the European Union as part of the European Stress Physiology and Climate Experiment. Wheat project (contract no. EV5V-C793-0301). IACR-Rothamsted receives grant-aided support from the Biotechnology and Biological Sciences Research Council of the United Kingdom.
*   Corresponding author; e-mail rowan.mitchell{at}bbsrc.ac.uk; fax 44-1582-763010.

Plant Physiol. (1998) 118: 945-955
Copyright Clearance Center:   0032-0889/98/118//11
© 1998 American Society of Plant Physiologists




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