Figure 5.

ra2 Expression Marks the Position of Inflorescence Axillary Meristems.

(A) to (C) and (E) to (I) ra2 expression in wild-type tissue.

(A) Tassel.

(B) Ear.

(C) Longitudinal section of a tassel tip showing ra2 expression predicting the position of spikelet pair meristems.

(D) Detail of ra1 expression in spikelet pair meristems of a tassel.

(E) Detail of ra2 expression in the anlagen of spikelet meristem.

(F) Front view of a row of spikelet pair meristems in an ear.

(G) Expression in a tassel primordium that is just initiating branch meristems.

(H) Hybridization of a young tassel tip showing expression of ra2 in axillary meristem anlagen above the bract primordia (red arrows).

(I) Tip of a tassel of similar stage of development as in (A) showing hybridization with a gene-specific probe.

(J) and (K) ra2 expression in ra mutants: ra3 tassel (J); ra1 tassel branch (K).

Bars = 0.5 mm (A), (B), and (G) to (J) and 50 μm in (C) to (F) and (K).