Exploring molecular evolution of Rubisco in C₃ and CAM Orchidaceae and Bromeliaceae.

ABSTRACT:

Background

The CO₂-concentrating mechanism associated to Crassulacean acid metabolism (CAM) alters the catalytic context for Rubisco by increasing CO₂ availability and provides an advantage in particular ecological conditions. We hypothesized about the existence of molecular changes linked to these particular adaptations in CAM Rubisco. We investigated molecular evolution of the Rubisco large (L-) subunit in 78 orchids and 144 bromeliads with C₃ and CAM photosynthetic pathways. The sequence analyses were complemented with measurements of Rubisco kinetics in some species with contrasting photosynthetic mechanism and differing in the L-subunit sequence.

Results

We identified potential positively selected sites and residues with signatures of co

SUBMITTER: Hermida-Carrera C 

PROVIDER: S-EPMC6977233 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature