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The Good, The Bad, The Ugly: Using Naturally Occurring Terata To Distinguish The Possible From The Impossible In Orchid Floral Evolution, Richard M. Bateman, Paula J. Rudall
The Good, The Bad, The Ugly: Using Naturally Occurring Terata To Distinguish The Possible From The Impossible In Orchid Floral Evolution, Richard M. Bateman, Paula J. Rudall
Aliso: A Journal of Systematic and Floristic Botany
We interpret extensive field observations of terata in the context of recent insights into monocot phylogeny and evolutionary-developmental genetics to explore the evolution of the orchid flower. Our arguably typological classification of floral terata focuses on natural occurrences of three contrasting modes of peloria (restoration of actinomorphy in a formerly zygomorphic perianth) and three contrasting modes of pseudopeloria (lessening of the degree of zygomorphy shown by the evolutionarily preceding perianth). Dynamic evolutionary transitions in floral morphology are assigned to recently revised concepts of heterotopy (including homeosis: evolutionary transitions in position of expression) and heterochrony (evolutionary transitions in timing of expression), …
Molecular Basis Of Development In Petaloid Monocot Flowers, Bo Johansen, Signe Frederikson
Molecular Basis Of Development In Petaloid Monocot Flowers, Bo Johansen, Signe Frederikson
Aliso: A Journal of Systematic and Floristic Botany
and several studies have confirmed the extended ABC model as the molecular background of flower development in this plant group. The core eudicots are characterized as having one copy of each of the B-class genes and at least two copies of A-class genes: one is expressed in floral meristems, the other in inflorescence meristems. In monocots and non-core eudicots the validity of the ABC model is under discussion. Generally, more than one functional copy is found of at least one of the B-class genes. The A-class genes apparently are expressed in meristems of both flower and inflorescence. Morphologically petaloid stamens …