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Snapdragon as a Model Organism

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by

Elaine Cheung

on 26 April 2012

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Transcript of Snapdragon as a Model Organism

The Snapdragon as a Model Organism
Why study the snapdragon? Was cultivated in early
Roman settlements
due its large, attractive,
bilaterally symmetrical
flowers.  It emerged as a model organism during
early studies of inheritance and mutation
because of its ease of cultivation (three month generation time), ease of creating crosses,
and variation in morphology and flower color.  By the mid-nineteenth century, many
morphological and color variants were
available for biological study- including
but not limited to variants whose reproductive
organs were replaced with additional flower
petals, as well as some flowers with radial
symmetry.  Because A. majus diverged from the
more commonly used eudicot model
Arabidopsis thaliana early in the history
of flowering plants, it has proven to be
useful in comparative developmental studies. Uses of the A. majus model system? Biochemistry
Development
Ecology and Population Genetics
BIOCHEMISTRY
Mechanisms used to attract bees to flower?
1) SCENT:
What are the genes encoding the enzymes involved in floral scent production?
2) COLOR:
What is the basis for the color variation within Antirrhinum species? DEVELOPMENT
Contributed to the ABC model of floral organ speciation
Genes for leaf growth and development


ECOLOGY AND
POPULATION GENETICS
Close relatives of A. majus
form a monophyletic group of ~20 species, varied in habitat, morphology, ecology but can all form fertile hybrids with one another
Gametophytic
self-incompatibility results in obligate outbreeders
Sources:

Adams, S.R., M. Munir, V.M. Valdés, F.A. Langton, and S.D. Jackson. 2003. Using Flowering Times and Leaf Numbers to Model the Phases of Photoperiod Sensitivity in Antirrhinum majus L. Annals of Botany 92: 689-696.

Beck, C. 2003. The Snapdragon- A Valid Model Plant. Max Planck Research 4: 52-54.

Hudson, A., J. Critchley, and Y. Erasmus. 2008. The Genus Antirrhinum (Snapdragon): A Flowering Plant Model for Evolution and Development. Cold Harbor Spring Protocol: 1-8.

Schwarz-Sommer, Z., B. Davies, and A.Hudson. 2003. An Everlasting Pioneer: the Story of Antirrhinum Research. Nature 4: 655-664.

Suchet, C., L. Dormont, B. Schatz, M. Giurfa, V. Simon, C. Raynaud, and J. Chave. 2011. Floral Scent Variation in Two Antirrhinum majus subspecies influences the choice of naïve bumblebees. Behavioral Ecology and Sociobiology 65: 1015–1027.
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