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PLANT PHYSIOLOGY , Vol 113, Issue 2 469-477, Copyright © 1997 by American Society of Plant Biologists

BIOCHEMISTRY AND ENZYMOLOGY

Reduction of Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase by Antisense RNA in the C4 Plant Flaveria bidentis Leads to Reduced Assimilation Rates and Increased Carbon Isotope Discrimination

S. von Caemmerer, A. Millgate, G. D. Farquhar and R. T. Furbank
Research School of Biological Sciences, Australian National University, GPO Box 475, Canberra 2601, Australia (S.v.C., A.M., G.D.F.)

Transgenic Flaveria bidentis (a C4 species) plants with an antisense gene directed against the mRNA of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) were used to examine the relationship between the CO2 assimilation rate, Rubisco content, and carbon isotope discrimination. Reduction in the amount of Rubisco in the transgenic plants resulted in reduced CO2 assimilation rates and increased carbon isotope discrimination of leaf dry matter. The H2O exchange was similar in transgenic and wild-type plants, resulting in higher ratios of intercellular to ambient CO2 partial pressures. Carbon isotope discrimination was measured concurrently with CO2 and H2O exchange on leaves of the control plants and T1 progeny with a 40% reduction in Rubisco. From the theory of carbon isotope discrimination in the C4 species, we conclude that the reduction in the Rubisco content in the transgenic plants has led to an increase in bundle-sheath CO2 concentration and CO2 leakage from the bundle sheath; however, some down-regulation of the C4 cycle also occurred.


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