Leaf anatomy in wild-type plants and three independently generated <i>PRORP1</i> RNAi mutants (RNAi-2, RNAi-5 and RNAi-12).

<p>Cross sections of 15-day-old leaves stained with toluidine blue O are shown. Note reduced spongy mesophyll cell layers and increased size of cylindrical palisade cells in the RNAi plants. E: epidermis; P: palisade parenchyma; S: spongy mesophyll. Scale bars: 200 μm.