Leveraging the use of herbarium collections in modern systematics—examples from Pteridology
Barrington, David S. .
Recent progress in the quantitative analysis of form and color in fern hybrids.
Fern biologists have recently been using numbers to represent the variation in hybrid complexes, especially variation in leaf form and scale color. Both landmark and graphic approaches can be used to represent leaf form with the goal of discriminating between hybrids and their progenitors. In either case, multivariate analyses such as principal-components analysis provide insights into the relationships of the taxa as well as evidence of the characters that are most useful in distinguishing the hybrids from their progenitors. Similarly, color can be quantified using standard color chips with quantitative definition such as with reference to the Munsell color solid. These color data also behave well in multivariate analyses. With the advent of flow cytometry and nucleus size as convenient witnesses to genome size, discriminant function analyses can be used to test hypotheses for the fidelity of morphometric characters to genome characteristics. Analysis of low-copy nuclear DNA sequences from herbarium specimens provides additional clues to genome constitution, critical to the interpretation of morphometric relationships among hybrids and their progenitors. There remains the obdurate problem of scoring these characters in phylogenetic analyses of the progenitor diploids once their hybrids have been removed.
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1 - University of Vermont, Plant Biology Department, Jeffords Hall , 63 Carrigan Dr. , Burlington, VT, 05405, United States
Presentation Type: Symposium or Colloquium Presentation
Location: Ballroom C/Convention Center
Date: Tuesday, August 3rd, 2010
Time: 10:10 AM