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© 1995 Oxford University Press

OTHER

Species variation in Rubisco specificity factor

E. Delgado1, H. Medrano1, A.J. Keys2 and M.A.J. Parry2,3

1Laboratori Fisiologia Vegetal, Departamento Biologia Ambiental, Institut d'Estudis Avangats (CSIC), Universitat de les Hies Balears Ctra. Valldemossa, km 7.5. 07071 Palma de Mallorca, Spain
2Biochemistry and Physiology Department, IACR-Rothamsted Harpenden, Herts AL52JQ, UK

3 To whom correspondence should be addressed. Fax: +441582 760981

Ribulose-1, 5-bisphosphate carboxylase/oxygenase(Rubisco) was highly purified from nine species native to the Balearic Islands. The specificity factor for Rubisco from each species was determined and compared with that of wheat. The specificity factors were comparable with published values for C3 plants, how-ever, the values for three species exceeded those of wheat. Natural selection in the hot, dry mediterranean conditions of the Balearic Island Mallorca has slightly increased the specificity factor of Rubisco in some species.

Key words: Specificity factor, total consumption, partitioning, carboxylase oxygenase ratios, ribulose bisphosphate, Rubisco, species variation


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