(A) Leaf transverse sections and longitudinal section to show the mesophyll cell length, mesophyll cell lobing and mesophyll cell width in IR64 and three wild rice species: O. schlechteri, O. granulata, and O. meyeriana. The lobed/smooth line of the mesophyll cell wall (arrows) is false colored in green that is visible as a result of auto-fluorescence of the wall components. Scale bars show 10 μm distance for transverse sections and 20 μm distance for the longitudinal sections. (B) The graph shows the quantitative values (average ±SD) of MCL, MCW, and LBMC (secondary axis). MCL = mesophyll cell length, MCW = mesophyll cell width, LBMC = mesophyll cell lobing.