Fig. 6. Micrographs of the spw1-1 dl-sup1 double mutant. (A) A spw1 dl-sup1 flower. Palea-like organs with trichomes are formed in whorl 2 (arrowhead). Three ectopic palea-like organs (arrows) were removed to show the inside of the flower. (B) An organ of undefined identity. Long hairs are indicated by arrowheads. (C) Enlargement of the hairs (arrowheads) formed at the margin of the organ in B. (D) A vertical view of the flower. Bifurcated floral meristems (arrowheads), producing organ primordia (arrows) indeterminately. (E) A longitudinal section of an organ of unknown identity (arrowhead) showing no apparent differentiation of gametophytic tissues inside. (F-I) Scanning electron micrographs showing early development of spw1-1 dl-sup1 flowers. (F) A spw1-1 dl-sup1 flower producing six organ primordia (one primordium is covered by the lemma) in whorl 3 (arrowheads). (G) Six primordia in whorl 3 develop into structures that are not found in the wild type (arrows), and the floral meristem becomes enlarged in the lemma-palea direction (arrowhead). (H) The central floral meristem proliferates to form a number of apices (arrowheads). (I) Additional organs (arrowheads) are formed in an irregular arrangement from each meristematic apex. Bars: 500 µm (A,B,E), and 50 µm (C,D,F-I).

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