부산대학교 도서관

ABSTRACTThe hooded (hdd)floral mutant of sweet pea (Lathyrus odoratusL.) is apparently caused by loss of function of the floral developmental gene CYCLOIDEA(CYC). It has a concavely folded dorsal petal (standard) compared to the more or less flat standard of the wild type. To examine localised growth differences in wild type and hddflowers, we printed fine-scale grids on the surfaces of sweet pea buds using inkjet technology. Wild-type standard petals have a more uniform rate of growth, whereas hddstandard petals show increased growth at their margins. The resultant lamina/margin growth differential leads to negative Gaussian curvature and can account for the differences in curvature between wild-type and hddpetals. We conclude that CYChas a role in the negative regulation of marginal petal growth in Lathyrusin order to maintain dorsal petal flatness. Differences in CYCexpression and activity could possibly contribute to the range of dorsal petal form seen throughout the Fabaceae.