INTRODUCTIONThe Antirrhinum species group comprises approximately 20 morphologically diverse members that are able to form fertile hybrids. It includes the cultivated snapdragon Antirrhinum majus, which has been used as a model for biochemical and developmental genetics for more than 75 yr. The research infrastructure for A. majus, together with the interfertility of the species group, allows A...

As a model system in classical plant genetics, the genus Antirrhinum has been well studied, especially in gametophytic self-incompatibility, flower development biology, and transposon-induced mutation. In contrast to the advances in genetic and molecular studies, little is known about Antirrhinum cytogenetics. In this study, we isolated two tandem repetitive sequences, CentA1 and CentA2, from t...

Antirrhinum majus, Flavonoid Biosynthesis, Flavanone Oxidase, Apigenin, Luteolin Enzyme preparations from flowers of Antirrhinum majus catalysed the oxidation of naringenin to apigenin and of eriodictyol to luteolin. Enzyme activity was found to be localized in the microsomal fraction. The reaction required NADPH as cofactor and had a pH optimum of about 7.0. The NADPH-dependent microsomal enzy...

A striking aspect of flowering plant (angiosperm) diversity is variation in flower symmetry. From an ancestral form of radial symmetry (polysymmetry, actinomorphy), multiple evolutionary transitions have contributed to instances of non-radial forms, including bilateral symmetry (monosymmetry, zygomorphy) and asymmetry. Advances in flowering plant molecular phylogenetic research and studies of c...

A positive regulatory element directing maximal expression of the Antirrhinum majus chalcone synthase promoter was characterized by protein-DNA-interaction studies and cis deletion analysis. The positive regulatory element consists of a 47 base pair direct repeat between positions -564 and -670 and provides three binding sites for nuclear protein factors from Nicotiana tabacum and Antirrhinum m...

Genetic and molecular analyses in two eudicot plants, Hong Ma* and Claude dePamphilis Department of Biology and Arabidopsis thaliana and Antirrhinum majus, have idenThe Life Sciences Consortium tified several genes that specify floral organ identity. Penn State University These studies led to the proposal of the ABC model University Park, Pennsylvania 16802 (Coen and Meyerowitz, 1991; Ma, 1994)...