Studying evolutionary constraints on an invariant floral trait in Wild Radish Raphanus raphanistrum
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Authors
Fergus, C. Emi
Issue Date
2002
Type
Presentation
Language
en_US
Keywords
Alternative Title
Abstract
Traits that are conserved through time and location are considered invariant characters. In the
flowering world, these floral traits are useful in classifying plants. Little is known about the
mechanisms that maintain these invariant traits.
There are three non-mutually exclusive hypotheses to explain restricted variability of traits: 1) Little
genetic variation; 2) Stabilizing selection; 3) Evolutionary constraints taking the form of physical,
chemical, or developmental constraints.
In the plant Raphanus raphanistrum (wild radish) there is a high correlation between filament height
and corolla tube length. The position of the anther is referred to as anther exsertion. Anther exsertion
can be calculated from the differences in filament height and corolla tube length. In natural
populations, anther exsertion is zero with the anthers positioned at the opening of the corolla tube.
Description
1 broadside ; ill.
Citation
Publisher
Kalamazoo College