In situ hybridization of OsMADS13 and OsMADS3. A, Longitudinal section of a wild-type flower at early stage Sp8 showing the specific expression of OsMADS13 in ovule primordium. B, Transverse section of one wild-type flower at late stage Sp8 showing the expression of OsMADS13 in the ovule. C, The expression of OsMADS13 in osmads3-4 at stage Sp8. D, No detectable expression of OsMADS13 in dl-sup6. E, The expression of OsMADS3 in the wild-type stamen primordia at stage Sp6. F, At stage Sp8, there is detectable expression of OsMADS3 in the wild-type ovule. G, OsMADS3 transcripts were observed in the abnormal ovule in osmads13-3 at stage Sp8. H, OsMADS3 transcripts in ectopic stamens in dl-sup6 at stage Sp8. ca, Capel; es, ectopic stamen; fm, floral meristem; lo, lodicules; st, stamen. Bars = 100 μm except for 50 μm in E.