Brassicaceae display variation in efficiency of photorespiratory carbon-recapturing mechanisms.

Autor:	Schlüter U; Institute of Plant Biochemistry, Cluster of Excellence for Plant Sciences (CEPLAS), Heinrich Heine University, Universitätsstr. 1, D-40225 Düsseldorf, Germany., Bouvier JW; Institute of Plant Biochemistry, Cluster of Excellence for Plant Sciences (CEPLAS), Heinrich Heine University, Universitätsstr. 1, D-40225 Düsseldorf, Germany., Guerreiro R; Institute for Quantitative Genetics and Genomics of Plants, Cluster of Excellence for Plant Sciences (CEPLAS), Heinrich Heine University, Universitätsstr. 1, D-40225 Düsseldorf, Germany., Malisic M; Institute of Plant Biochemistry, Cluster of Excellence for Plant Sciences (CEPLAS), Heinrich Heine University, Universitätsstr. 1, D-40225 Düsseldorf, Germany., Kontny C; Institute of Plant Biochemistry, Cluster of Excellence for Plant Sciences (CEPLAS), Heinrich Heine University, Universitätsstr. 1, D-40225 Düsseldorf, Germany., Westhoff P; Metabolomics and Metabolism Laboratory, Cluster of Excellence for Plant Sciences (CEPLAS), Heinrich Heine University, Universitätsstr. 1, D-40225 Düsseldorf, Germany., Stich B; Institute for Quantitative Genetics and Genomics of Plants, Cluster of Excellence for Plant Sciences (CEPLAS), Heinrich Heine University, Universitätsstr. 1, D-40225 Düsseldorf, Germany., Weber APM; Institute of Plant Biochemistry, Cluster of Excellence for Plant Sciences (CEPLAS), Heinrich Heine University, Universitätsstr. 1, D-40225 Düsseldorf, Germany.
Jazyk:	angličtina
Zdroj:	Journal of experimental botany [J Exp Bot] 2023 Nov 21; Vol. 74 (21), pp. 6631-6649.
DOI:	10.1093/jxb/erad250
Abstrakt:	Carbon-concentrating mechanisms enhance the carboxylase efficiency of Rubisco by providing supra-atmospheric concentrations of CO2 in its surroundings. Beside the C4 photosynthesis pathway, carbon concentration can also be achieved by the photorespiratory glycine shuttle which requires fewer and less complex modifications. Plants displaying CO2 compensation points between 10 ppm and 40 ppm are often considered to utilize such a photorespiratory shuttle and are termed 'C3-C4 intermediates'. In the present study, we perform a physiological, biochemical, and anatomical survey of a large number of Brassicaceae species to better understand the C3-C4 intermediate phenotype, including its basic components and its plasticity. Our phylogenetic analysis suggested that C3-C4 metabolism evolved up to five times independently in the Brassicaceae. The efficiency of the pathway showed considerable variation. Centripetal accumulation of organelles in the bundle sheath was consistently observed in all C3-C4-classified taxa, indicating a crucial role for anatomical features in CO2-concentrating pathways. Leaf metabolite patterns were strongly influenced by the individual species, but accumulation of photorespiratory shuttle metabolites glycine and serine was generally observed. Analysis of phosphoenolpyruvate carboxylase activities suggested that C4-like shuttles have not evolved in the investigated Brassicaceae. Convergent evolution of the photorespiratory shuttle indicates that it represents a distinct photosynthesis type that is beneficial in some environments. (© The Author(s) 2023. Published by Oxford University Press on behalf of the Society for Experimental Biology.)
Databáze:	MEDLINE
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