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Mesophyll conductance ( g  m ) limits CO 2 diffusion from sub-stomatal internal cavities to the sites of RuBP carboxylation. However, the response of g  m to light intensity remains controversial. Furthermore, little is known about the light response of relative mesophyll conductance limitation ( l  m ) and its effect on photosynthesis. In this study, we measured chlorophyll fluorescence and gas exchange in nine evergreen sclerophyllous Rhododendron species. g  m was maintained stable across light intensities from 300 to 1500 μmol photons m -2 s -1 in all these species, indicating that g  m did not respond to the change in illumination in them. With an increase in light intensity, l  m gradually increased, making g  m the major limiting factor for area-based photosynthesis ( A  N ) under saturating light. A strong negative relationship between l  m and A  N was found at 300 μmol photons m -2 s -1 but disappeared at 1500 μmol photons m -2 s -1 , suggesting an important role for l  m in determining A  N at sub-saturating light. Furthermore, the light-dependent increase in l  m led to a decrease in chloroplast CO 2 concentration ( C  c ), inducing the gradual increase of photorespiration. A higher l  m under saturating light made A  N more limited by RuBP carboxylation. These results indicate that the light response of l  m plays significant roles in determining C  c , photorespiration, and the rate-limiting step of A  N .

The Light Dependence of Mesophyll Conductance and Relative Limitations on Photosynthesis in Evergreen Sclerophyllous Rhododendron Species