Molecular basis of development in petaloid monocot flowers

Autor: Johansen, Bo, Frederiksen, Signe, Skipper, Martin
Jazyk: angličtina
Rok vydání: 2006
Zdroj: Johansen, B, Frederiksen, S & Skipper, M 2006, ' Molecular basis of development in petaloid monocot flowers ', Aliso, no. 22, pp. 151-158 .
Popis: The molecular background of flower development has been intensively studied within core eudicots,and several studies have confirmed the extended ABC model as the molecular background of flowerdevelopment in this plant group. The core eudicots are characterized as having one copy of each ofthe B-class genes and at least two copies of A-class genes: one is expressed in floral meristems, theother in inflorescence meristems. In monocots and non-core eudicots the validity of the ABC modelis under discussion. Generally, more than one functional copy is found of at least one of the B-classgenes. The A-class genes apparently are expressed in meristems of both flower and inflorescence.Morphologically petaloid stamens and styles are well known within the petaloid monocots, whereasthe phenomenon is rare in core eudicots. A simple model based on the extra copies of B-class genescan explain the molecular background of petaloid stamens in the monocots; the only requirement isthat two copies of the same gene have different expression patterns and are responsible for developmentof petals and stamens, respectively. The formation of petaloid styles can be explained in thesame way, but this hypothesis requires that A- and C-class gene expression is not mutually exclusivein monocots. The difference in expression of the A-class genes outside the floral organs shows afundamental difference between monocot and core eudicot flowers.
Databáze: OpenAIRE
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