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Analyzing the proportions of stomatal (S L ), mesophyll conductance (MC L ) and biochemical limitations (B L ) imposed by potassium (K) deficit, and evaluating their relationships to leaf K status will be helpful to understand the mechanism underlying the inhibition of K deficiency on photosynthesis ( A ). A quantitative limitation analysis of K deficiency on photosynthesis was performed on leaf margins and centers under K deficiency and sufficient K supply treatments of  Brassica napus  L. Potassium deficiency decreased  A , stomatal ( g  s ) and mesophyll conductance ( g  m ) of margins, S L , MC L  and B L  accounted for 23.9%, 33.0% and 43.1% of the total limitations. While for leaf centers, relatively low limitations occurred. Nonlinear curve fitting analysis indicated that each limiting factor generated at same leaf K status (1.07%). Although MC L  was the main component of limitations when  A  began to fall, B L  replaced it at a leaf K concentration below 0.78%. Up-regulated MC L  was related to lower surface area of chloroplasts exposed to intercellular airspaces ( S  c / S ) and larger cytosol diffusion resistance but not the cell wall thickness. Our results highlighted that photosynthetic limitations appear simultaneously under K deficiency and vary with increasing K deficiency intensity.

Differences on photosynthetic limitations between leaf margins and leaf centers under potassium deficiency for Brassica napus L.