Klein, Laura .
Morphology and Introgressive Hybridization in North American Diphasiastrum.
Although interspecific hybridization in plants often results in sterility, occasionally hybrids show evidence of fertility. Because of their reproductive competence, such F1's have the ability to interbreed with each other and with their parents, forming introgressive offspring that are morphologically intermediate between the original parental forms.North American Diphasiastrum complanatum, D. digitatum, and D. tristachyum exhibit evidence of such introgressive hybridization. To test for introgression, morphological measurements for parental and putative hybrid taxa were collected and analyzed using principle components analyses and hybrid indices. Spore fertility was also analyzed within the study set. Results support the presence of introgression among all three pair combinations. Although not infrequent, the numbers of hybrid forms are far exceeded by parental forms and so there are no compelling reasons not to recognize these three taxa at the species level.
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1 - Saint Louis University, Department of Botany, 3507 Laclede Ave, Saint Louis, MO, 63108, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Melrose/Riverside Hilton
Date: Tuesday, July 30th, 2013
Time: 2:00 PM
Candidate for Awards:Edgar T. Wherry award