The petal phenotype caused by Pro35S:SPL/NZZ may require a functional AG. A, A Pro35S:SPL/NZZ young flower showing unclosed sepals and small petals. B, A Pro35S:SPL/NZZ flower showing four narrow petals. C, An ag-1 Pro35S:SPL/NZZ young flower. D, An ag-1 Pro35S:SPL/NZZ flower showing normal petals in the second whorl. E, An ag-1 flower. Bars = 0.5 mm.