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Environmentally driven evolution of Rubisco and improved photosynthesis and growth within the C3 genus Limonium (Plumbaginaceae).
- Source :
- New Phytologist; Aug2014, Vol. 203 Issue 3, p989-999, 11p, 1 Diagram, 1 Chart, 4 Graphs, 1 Map
- Publication Year :
- 2014
-
Abstract
- • Carbon assimilation by most ecosystems requires ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco). Its kinetic parameters are likely to have evolved in parallel with intracellular CO<subscript>2</subscript> availability, with the result that faster forms of Rubisco occur in species with CO<subscript>2</subscript>-concentrating mechanisms. • The Rubisco catalytic properties were determined and evaluated in relation to growth and carbon assimilation capacity in Mediterranean Limonium species, inhabiting severe stress environments. • Significant kinetic differences between closely related species depended on two amino acid substitutions at functionally important residues 309 and 328 within the Rubisco large subunit. The Rubisco of species facing the largest CO<subscript>2</subscript> restrictions during drought had relatively high affinity for CO<subscript>2</subscript> (low Michaelis-Menten constant for CO<subscript>2</subscript> (K<subscript>c</subscript>)) but low maximum rates of carboxylation (k<superscript>c</superscript><subscript>cat</subscript>), while the opposite was found for species that maintained higher CO<subscript>2</subscript> concentrations under similar conditions. Rubisco kinetic characteristics were correlated with photosynthetic rate in both well-watered and drought-stressed plants. Moreover, the drought-mediated decrease in plant biomass accumulation was consistently lower in species with higher Rubisco carboxylase catalytic efficiency (k<superscript>c</superscript><subscript>cat</subscript>/K<subscript>c</subscript>). • The present study is the first demonstration of Rubisco adaptation during species diversification within closely related C<subscript>3</subscript> plants, revealing a direct relationship between Rubisco molecular evolution and the biomass accumulation of closely related species subjected to unfavourable conditions. [ABSTRACT FROM AUTHOR]
- Subjects :
- PHOTOSYNTHESIS
LIMONIUM
PLANT growth
PLUMBAGINACEAE
PHOTOADDITION
PLANT species
Subjects
Details
- Language :
- English
- ISSN :
- 0028646X
- Volume :
- 203
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- New Phytologist
- Publication Type :
- Academic Journal
- Accession number :
- 102079635
- Full Text :
- https://doi.org/10.1111/nph.12858