Developmental and Structural Section
Bray, Rebecca D , Alarid, Khalid M .
The effect of interspecific hybridization and chromosome doubling on spore morphology, orbicule typology, sporangial wall ornamentation and velum coverage in Isoetes .
BASED on morphology and distribution, Isoetes appalachiana (2n = 4x = 44) has been suspected to be the allotetraploid derivative of two basic diploids (2N = 2x = 22) I. engelmannii and I. valida. In western Virginia, the interspecific hybrid between I. engelmannii and I. valida, I. Xaltonharvillii has been discovered where its parents co-occur. These interspecific relationships have been verified by comparison of the second intron of a LFY homolog for these taxa. The current study of these 4 taxa examines morphology of spores, sporangial wall pigmentation, velum coverage, orbicule typology and stomatal character states to determine if morphological data mirrors molecular data.
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1 - Old Dominion University, Department of Biological Sciences, Mills Godwin Building, 45th Street, Norfolk, Virginia, 23529-0266, USA
Presentation Type: Oral Paper:Papers for Sections
Location: 303/Bell Memorial Union
Date: Wednesday, August 2nd, 2006
Time: 10:30 AM