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Fig. 1. The roxy1 phenotype. (A) Wild-type flower. (B-D) Phenotypes of
roxy1-3 flowers. Petal number is reduced and the size often smaller,
forming an abnormal blade and base. Arrow in D marks a filament-like stalk of
a petal with a reduced blade. (E-L) SEM photographs of wild-type (E) and
roxy1-3 mutant flowers (F-L) after onset of organ differentiation
(stages 8-10) (Smyth et al.,
1990). Sepals were partially or completely removed to reveal inner
organs. Arrows indicate wild-type and abnormal petals in the second whorl
between the medial (ms) and lateral (ls) stamens. Petal primordia often fail
to be initiated, indicated by arrowheads (G,H). (I) roxy1-3 petal
showing abnormal folding at the tip. (J) Conical cells, similar to wild-type
cells, are formed in the inner petal epidermis at the tip of the folded
petals. (K,L) Occasionally, roxy1-3 second whorl organs form fused
(K) or filamentous structures that carry cells resembling stigmatic papillae
at their tips (L). Scale bar: 50 µm.
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