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Annals of Botany 89: 125-127, 2002
© 2002 Annals of Botany Company

Wild Manihot Species Do Not Possess C4 Photosynthesis

P.-A. CALATAYUD1, C. H. BARÓN1, H. VELÁSQUEZ2, J. A. ARROYAVE2 and T. LAMAZE*,3

1Institut de Recherche pour le Développement (IRD), CIAT, AA 6713, Cali, Colombia, 2International Centre for Tropical Agriculture (CIAT), CIAT, AA 6713, Cali, Colombia and 3Centre d’Etude Spatiale de la Biosphère (Cesbio), (UMR: CNES-CNRS-UPS-IRD), Bât. 4R1 Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse Cedex, France

 * For correspondence. Fax + 33 5 61 55 67 49, e-mail lamaze{at}cict.fr

Received: 28 June 2001; Returned for revision: 28 August 2001; Accepted: 12 October 2001.

ABSTRACT

Cultivated cassava (Manihot esculenta) has a higher rate of photosynthesis than is usual for C3 plants and photosynthesis is not light saturated. For these reasons it has been suggested that cultivated cassava could be derived from wild species possessing C4 photosynthesis. The natural abundance of 13C and activities of phosphoenolpyruvate carboxylase and phosphoglycolate phosphatase were measured in leaves of 20 wild cassava species to test this hypothesis. All the species studied, including M. flabellifolia the potential wild progenitor of cultivated cassava, clearly exhibited C3 not C4 characteristics.

Key words: Cassava, 13C discrimination, phosphoenolpyruvate carboxylase (PEP Case), phosphoglycolate phosphatase (PGP).


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