Insights from transcriptome profiling on the non-photosynthetic and stomatal signaling response of maize carbonic anhydrase mutants to low CO₂.

ABSTRACT:

Background

Carbonic anhydrase (CA) catalyzes the hydration of CO₂ in the first biochemical step of C₄ photosynthesis, and has been considered a potentially rate-limiting step when CO₂ availability within a leaf is low. Previous work in Zea mays (maize) with a double knockout of the two highest-expressed β-CA genes, CA1 and CA2, reduced total leaf CA activity to less than 3% of wild-type. Surprisingly, this did not limit photosynthesis in maize at ambient or higher CO₂concentrations. However, the ca1ca2 mutants exhibited reduced rates of photosynthesis at sub-ambient CO₂, and accumulated less biomass when grown under sub-ambient CO₂ (9.2 Pa). To further clarify the importance of CA for C₄ photosynthesis, we

SUBMITTER: Kolbe AR 

PROVIDER: S-EPMC6377783 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature