Effects of 35S:MtCLE13 on nodulation in the supernodulating pea mutants sym29, sym28, and nod3. A to D, Examples of the nodulation phenotype of GFP-positive transgenic roots carrying the 35S:GUS (control) or 35S:MtCLE13 construct on Frisson (A and B) and Rondo (C and D) wild-type plants. E to J, Examples of the nodulation phenotype of GFP-positive transgenic roots carrying the 35S:GUS (control) or 35S:MtCLE13 construct on the sym29 (E and F), sym28 (G and H), and nod3 (I and J) mutants. Approximately 18 to 25 plants were analyzed with similar results. Bars = 1,000 μm.