Photorespiration differs among Arabidopsis thaliana ecotypes and is correlated with photosynthesis.

摘要: A greater understanding of natural variation in photosynthesis will inform strategies for crop improvement by revealing overlooked opportunities. We use Arabidopsis thaliana ecotypes as a model system to assess (i) how and photorespiration covary (ii) mesophyll conductance influences water efficiency (WUE). Phenotypic photorespiratory CO2 efflux was correlated with assimilation rates two metrics photosynthetic capacity (i.e. VCmax Jmax); however, genetic correlations were not detected between photorespiration. found standing variation-as broad-sense heritability-for most traits, including Genetic correlation electron transport carboxylation capacities indicates that these traits are genetically constrained. Winter had conductance, maximum capacity, leaf structural robustness when compared spring ecotypes. Stomatal varied little winter ecotypes, leading positive integrated WUE conductance. Thus, can modulate among A. without significant loss assimilation. supplying energy carbon the Calvin-Benson cycle consistent biochemical models, suggesting selection on either would improve all them. Similarly, lack suggests scaling be broken.