Antibodies to neoxanthin agglutinate stroma-free swellable chloroplasts from tobacco (Nicotiana tabacum var. John William's Broadleaf) and Antirrhinum (Antirrhinum majus) whereas stroma-freed chloroplasts, which have lost the swellability are not agglutinated despite the fact that antibodies to neoxanthin are specifically absorbed. In this latter case the agglutination is hindered for sterical ...

In the last 15 years, knowledge of the molecular and genetic mechanisms that underlie floral induction, floral patterning, and floral organ identity has exploded. Elucidation of basic mechanisms has derived primarily from work in three dicot species: Antirrhinum majus, Arabidopsis thaliana, and Petunia hybrida. Although Antirrhinum and petunia have contributed fundamental breakthroughs to our u...

To understand better the mechanisms that lead to dorsoventrality in the lateral organs of plants, mutants at the phantastica (phan) locus of Antirrhinum majus have been identified and characterised. The leaves, bracts and petal lobes of phan mutants show varying degrees of reduction in dorsal tissues, indicating that phan is required for establishing dorsal cell identity. Each phan mutant produ...