Snow, Allison , Sweeney, P. M. , Wildova, R. , Goldberg, D. E. .
Is invasive Typha x glauca always an F1 hybrid in the north-central USA?
Spontaneous crosses between two common cattail species in North America has resulted in hybrid populations that may be more invasive than their parents. Typha latifolia L. (broad-leaved cattail) is native to North America, while T. angustifolia L. (narrow-leaved cattail) is considered to be invasive and is thought to have been introduced from Europe in the mid-nineteenth century. Putative sterile hybrids, which are known as Typha x glauca, can be difficult to identify based on morphological traits. Despite concerns about the competitiveness and rapid spread of T. x glauca, very little quantitative data has been published on its genetics, ecology, or relative invasiveness compared to either parent species. Previous molecular studies indicated that T. x glauca are first generation (F1 ) progeny between T. latifolia and T. angustifolia. In a pilot study, we screened 30 putative hybrids from a population in Cheboygan, MI, for the presence of three species-specific RAPD markers in 2004. Individuals were sampled at intervals of at least 10 m apart to reduce the likelihood of sampling more than one ramet from each clone. Three of the 30 plants were genetically distinct, advanced-generation hybrids, while the rest had a full complement of markers from both parents, as expected for F1 hybrids. This represents the first molecular evidence for possible introgression between T. latifolia and T. angustifolia. We hypothesize that partially fertile F1 hybrids can backcross with their parent taxa or produce self-pollinated F2 progeny. This process could have important implications for the evolution and invasiveness of both T. x glauca and T. angustifolia if the above scenario is supported further by our ongoing research.
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1 - Ohio State University, Department of Ecology, Evolution, & Organismal Biology, 300 Aronoff Laboratory, 318 W. 12Th Avenue, Columbus, Ohio, 43210-1293, USA
2 - University of Michigan, Department of Ecology & Evolutionary Biology, Ann Arbor, Michigan, 48109-1048, USA
Presentation Type: Oral Paper
Location: Salon A - Gov Ballroom/Hilton
Date: Monday, August 15th, 2005
Time: 11:30 AM