Evolutionary implications of C3-C4intermediates in the grassAlloteropsis semialata
| Autor: | Colin P. Osborne, Brad S. Ripley, Marjorie R. Lundgren, Richard C. Leegood, Christine M. Long, Pascal-Antoine Christin, Emmanuel Gonzalez Escobar, Guillaume Besnard, Roger P. Ellis, Paul W. Hattersley |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
0301 basic medicine Adaptive value Natural selection Phylogenetic tree Physiology Lineage (evolution) Plant Science 15. Life on land Biology Photosynthesis 01 natural sciences 03 medical and health sciences 030104 developmental biology Compensation point Phylogenetics Botany 010606 plant biology & botany Hybrid |
| Zdroj: | Plant, Cell & Environment. 39:1874-1885 |
| ISSN: | 0140-7791 |
| Popis: | C4 photosynthesis is a complex trait resulting from a series of anatomical and biochemical modifications to the ancestral C3 pathway. It is thought to evolve in a stepwise manner, creating intermediates with different combinations of C4 -like components. Determining the adaptive value of these components is key to understanding how C4 photosynthesis can gradually assemble through natural selection. Here, we decompose the photosynthetic phenotypes of numerous individuals of the grass Alloteropsis semialata, the only species known to include both C3 and C4 genotypes. Analyses of δ(13) C, physiology and leaf anatomy demonstrate for the first time the existence of physiological C3 -C4 intermediate individuals in the species. Based on previous phylogenetic analyses, the C3 -C4 individuals are not hybrids between the C3 and C4 genotypes analysed, but instead belong to a distinct genetic lineage, and might have given rise to C4 descendants. C3 A. semialata, present in colder climates, likely represents a reversal from a C3 -C4 intermediate state, indicating that, unlike C4 photosynthesis, evolution of the C3 -C4 phenotype is not irreversible. |
| Databáze: | OpenAIRE |
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