Chloroplast-mediated regulation of CO2-concentrating mechanism by Ca2+-binding protein CAS in the green alga Chlamydomonas reinhardtii.

ABSTRACT: Aquatic photosynthetic organisms, including the green alga Chlamydomonas reinhardtii, induce a CO₂-concentrating mechanism (CCM) to maintain photosynthetic activity in CO₂-limiting conditions by sensing environmental CO₂ and light availability. Previously, a novel high-CO₂-requiring mutant, H82, defective in the induction of the CCM, was isolated. A homolog of calcium (Ca²⁺)-binding protein CAS, originally found in Arabidopsis thaliana, was disrupted in H82 cells. Although Arabidopsis CAS is reported to be associated with stomatal closure or immune responses via a chloroplast-mediated retrograde signal, the relationship between a Ca²⁺ signal and the CCM associated with the function of CAS in an aquatic environment is still u

SUBMITTER: Wang L 

PROVIDER: S-EPMC5098658 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature