Abstract
In the Japanese morning glory, there are various mutants not only in color or pattern of petal, but also in morphology of lateral organs. A classic morphological mutant, delicate (dl) has narrow leaves and separated flowers. We succeeded to isolate the responsible gene DL using STD (simplified transposon display) method. The DL encodes the ortholog of FILAMENTOUS FLOWER (FIL) in Arabidopsis and GLAMINIFOLIA (GRAM) in Antirrhinum. These genes are a member of YABBY family transcriptional factor expressing in the abaxial side of lateral organs and specify the abaxial identity. The collaborative expressions of adaxial/abaxial-specific transcriptional factors are known to be important for normal lamina growth, suggesting that a partial loss-of-abaxial identity in dl mutant causes narrow laminae.
