Greater mesophyll conductance and leaf photosynthesis in the field through modified cell wall porosity and thickness via AtCGR3 expression in tobacco.

ABSTRACT: Mesophyll conductance (g_m) describes the ease with which CO₂ passes from the sub-stomatal cavities of the leaf to the primary carboxylase of photosynthesis, Rubisco. Increasing g_m is suggested as a means to engineer increases in photosynthesis by increasing [CO₂] at Rubisco, inhibiting oxygenation and accelerating carboxylation. Here, tobacco was transgenically up-regulated with Arabidopsis Cotton Golgi-related 3 (CGR3), a gene controlling methylesterification of pectin, as a strategy to increase CO₂ diffusion across the cell wall and thereby increase g_m. Across three independent events in tobacco strongly expressing AtCGR3, mesophyll cell wall thickness was decreased by 7%-13%, wall porosity increased by 75% and g_m

SUBMITTER: Salesse-Smith CE 

PROVIDER: S-EPMC11331791 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature