NADP-Malic Enzyme from the C3-C4 Intermediate Specie Flaveria Floridana View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

1998

AUTHORS

Carlos S. Andreo , Paula Casati , Allah Fresco , María F. Drincovich

ABSTRACT

C4 plants have fully differentiated mesophyll (MC) and bundle sheath cells (BSC) which cooperate to fix CO2 by the C4 pathway. C4 plants are more efficient than C3 under some environmental conditions due to the higher CO2 concentration in BSC. C3-C4 intermediate species are thought to represent a stage in the evolutionary transition from the C3 to the C4 photosynthetic mechanism (1,2). MC of C3-C4 species function, as in C3 plants, fixing atmospheric CO2 through RuBisCO and generating C-2 compounds for the photosynthetic oxidation cycle. Two mechanisms are proposed to account for the low apparent photorespiration in these intermediate species. In one of them, which may be common to all intermediates, metabolites generated as a consequence of the RuBisCO oxygenase reaction in MC are metabolized in BSC and the CO2 released refixed by RuBisCO. In this way, reduced photorespiratory CO2 evolution occurs without the operation of a C4 cycle. In other class of intermediates, the operation of a limited C4 cycle between MC and BSC contributes to the further reduction of photorespiration. Flaveria floridana, a C3-C4 intermediate specie, was used in the present report to characterize different isoforms of NADP-malic enzyme (NADP-ME) and to evaluate their expression in different photosynthetic cell types. In previous studies, we detected three isoforms of the enzyme in various Flaveria intermediate species (3). One of them was found to be constitutively expressed in photosynthetic and non-photosynthetic tissues of the different species examined, while the other two isoforms were abundant only in photosynthetic tissues having partial or complete C4 photosynthesis. A correlation between these proteins, their function and the cDNAs already cloned (4) is necessary to understand the evolution of this protein among the different Flaveria species. More... »

PAGES

3579-3582

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-94-011-3953-3_835

DOI

http://dx.doi.org/10.1007/978-94-011-3953-3_835

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1090935942


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