Fig. 1. Ovule development in wild type (A-D), nzz-2 (E-H), ats (I-L), nzz-2 ats (M-P) and sup-5 (Q-T). Stages: (A,E,I,M) 2-I; (B,F,J,N,Q) 2-III; (R) 2-IV; (C,G,K,O,S) 3-IV; (D,H,L,P,T) 4-IV. The outer integument initiates earlier than the inner integument and is visible before the inner integument in nzz-2 (arrow in F). Adaxial growth of the outer integument can be seen in nzz ats (arrows in O and P). Abaxial initiation of the outer integument (arrows in Q and R) and the abnormal growth (arrows S and T) on the adaxial side can be seen in sup-5. nu, nucellus; ii, inner integument; oi, outer integument; fu, funiculus; mp, micropile; pt, pollen tube; ad, adaxial; ab, abaxial. Scale bars: 20 µm.

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