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Abstract Detail

Population Genetics

Wang, Ting [1], Su, Yingjuan [2].

Population genetic structure of the invasive weed Mikania micrantha in southern China: interactions between reproductive mode, bottlenecks and multiple introductions.

Characterization of the population genetic bases over the course of plant invasion can further our undersanding of invasiveness and assist in management practice. Mikania micrantha is one of the world's most invasive weeds. In this study, twenty-eight populations across its entire introduced range in southern China were examined with amplified fragment length polymorphism (AFLP) markers. Population genetic parameters were estimated by Bayesian approaches as well as conventional methods. Bottleneck signature, multilocus linkage disequilibrium, character compatibility, and cluster analyses were conducted to assay the factors that may act to shape population variability. High levels of genetic variation and differentiation were detected in the introduced populations of M. micrantha. All populations experienced severe bottlenecks. Most (19 out of 28) of them demonstrated significant linkage disequilibrium and matrix compatibility. Populations were mainly clustered into two groups, and those from different regions intermingled in the UPGMA dendrogram. No geographical signature was found in the pattern of population genetic variation. This research indicates that during M. micrantha invasion, multiple introductions ameliorated the loss of genetic variation associated with bottlenecks. Nontheless, bottlenecks indeed enhance the population differentiation. Human mediated long-distance dispersal events of seeds or propagules explain the lack of geographic structure in genetic variation. Although asexual reproduction is the predominant mating mode in M. micrantha, it has little effect on the population genetic composition.
Supported by grants from Key Pilot Project of Department of Science and Technology of Guangdong Province, China (grant no. 2004B33301020) and the ¡°100 Talent Project¡± of the Chinese Academy of Sciences (grant no. 0729281F02).

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1 - Wuhan botanical garden, Chinese Academy of Sciences, Evolutionary genetics, Moshan, Wuhan, Hubei, 430074, China
2 - Sun Yat-sen University, Biochemistry Department, Xingang Xi Road 135, Guangzhou, Guangdong, 510275, China

Invasive plants
population genetic structure
Bayesian approach
multiple introductions
reproductive mode
Mikania micrantha.

Presentation Type: Oral Paper:Papers for Topics
Session: 32
Location: 214/216/SUB
Date: Tuesday, July 29th, 2008
Time: 9:00 AM
Number: 32005
Abstract ID:325

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