INVESTIGADORES
DELGADO Luciana
artículos
Título:
The mutants compacta ähnlich, Nitida and Grandiflora define developmental compartments and a compensation mechanism in floral development in Antirrhinum majus
Autor/es:
DELGADO BENARROCH, LUCIANA; WEISS, JULIA; EGEA-CORTINES, MARCOS
Revista:
JOURNAL OF PLANT RESEARCH
Editorial:
SPRIGER-JAPAN
Referencias:
Año: 2009 vol. 122 p. 559 - 569
ISSN:
0918-9440
Resumen:
In order to improve our understanding of floral
size control we characterised three mutants of Antirrhinum
majus with different macroscopic floral phenotypes. The
recessive mutant compacta a¨hnlich has smaller flowers
affected mainly in petal lobe expansion, the dominant
mutant Grandiflora has overall larger organs, whilst the
semidominant mutation Nitida exhibits smaller flowers in a
dose-dependent manner. We developed a cell map in order
to establish the cellular phenotypes of the mutants. Changes
in organ size were both organ- and region-specific.
Nitida and compacta a¨hnlich affected cell expansion in
proximal and distal petal regions, respectively, suggesting
differential regulation between petal lobe regions.
Although petal size was smaller in compacta a¨hnlich than
in wild type, conical cells were significantly bigger, suggesting
a compensation mechanism involved in petal
development. Grandiflora had larger cells in petals and
increased cell division in stamens and styles, suggesting a
relationship between genes controlling organ size and
organ identity. The level of ploidy in petals of Grandiflora
and coan was found to be equivalent to wild type petals and
leaves, ruling out an excess of growth via endoreduplication.
We discuss our results in terms of current models
about control of lateral organ size.