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Fig. 1. lbl1 and Rld1-O mutually suppress each other. Relative to wild-type B73 (A), weak lbl1-ref (B) and severe lbl1-rgd1 (C) mutants have a reduced stature and develop a variety of leaf phenotypes with the most severe leaves being thread-like and abaxialized. Rld1-O/+ plants (D) have a normal stature but their leaves are curled upwards because of a partial inversion of adaxial/abaxial polarity. lbl1-ref Rld1-O double mutant leaves (E,F) appear normal or display very mild lbl1- or Rld1-O-like phenotypes, but their subtending internodes elongate normally. The lbl1-rgd1 Rld1-O phenotypes (G) are also less severe than either single mutant and frequently resemble the weaker phenotypes of lbl1-ref. Detached leaves (H) illustrate the range of leaf phenotypes observed. (H1) wild type; (H2) lbl1-ref; (H3) Rld1-O; (H4) lbl1-ref Rld1-O, note the reduced rolling of the proximal leaf blade near the ligule/auricle when compared with the Rld1-O leaf; (H5) lbl1-rgd1 Rld1-O, note the morphological similarity to the lbl1-ref leaf. Scale bar: 7.5 inches (190.5 mm).





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