Gibson, Phil .
Interpopulation Differences in Heterocarpic Achene Germination in Grindelia lanceolata (narrowleaf gumweed).
Grindelia lanceolata (narrowleaf gumweed, Asteraceae) is a heterocarpic species that grows in open, rocky habitats of prairies and in cedar glades communities with limestone derived soils. Ray and disc achenes produced in the same capitulum are structurally and functionally dissimilar (heterocarpy). Differences in germination have been documented between achenes of this and other heterocarpic species, but there are few comparisons of germination behavior among populations. We compared germination of ray and disc achenes among seven populations. Populations varied in overall germination behavior and response to different light and temperature regimes. Results suggest that populations have unique germination ecology which reflect the germination characteristics of the founding individuals as well as response to regional climatic conditions.
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1 - University of Oklahoma, Botany and Microbiology, 730 Van Vleet Oval, University of Oklahoma, Norman, OK, 73019, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Boulevard A/Hilton
Date: Wednesday, July 11th, 2007
Time: 1:00 PM