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Genetic Relationship between Cultivated and Feral Creeping Bentgrass (Agrostis stolonifera) in a Cultural Landscape

Published online by Cambridge University Press:  20 January 2017

Collin W. Ahrens  and
Carol A. Auer
Collin W. Ahrens*
Affiliation:
Department of Plant Science, University of Connecticut, Agricultural Biotechnology Lab, 1390 Storrs Road, Unit 4163, Storrs, CT 06269
Carol A. Auer
Affiliation:
Department of Plant Science, University of Connecticut, Agricultural Biotechnology Lab, 1390 Storrs Road, Unit 4163, Storrs, CT 06269
*
Corresponding author's E-mail: collinwahrens@gmail.com
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Abstract

Gene flow is an important consideration in the adoption of crops with novel traits or transgenes when sexually compatible relatives occur in the landscape. Unfortunately, gene flow and its long-term environmental impacts are very difficult to predict without releasing and studying the novel genotype. This project uses a retrospective population genetics approach to characterize the relationship between cultivated creeping bentgrass (CB) on a golf course and the same species in five feral populations nearby. CB plants were collected from an 8-yr-old golf course, five weedy populations up to 1,020 m from the golf course, and four modern CB cultivars. Using microsatellite markers and Bayesian inference, two major genetic clusters were distinguished: (1) CB cultivars and individuals from the golf course (cultivar genotype), and (2) the majority of individuals (62%) from the five feral populations (feral genotype). Two feral CB individuals (3.3% of all feral plants) were partially assigned to the cultivar genotype. Principal coordinates analysis agreed with this assignment, suggesting that an intraspecific hybridization event may have occurred. Plants in four feral populations showed a high degree of genetic similarity, but one feral population (Reservoir) was heterogeneous indicating that genetically complex CB populations can develop in cultural landscapes. While recognizing the limitations inherent in a single study of CB population genetics, these results add to the relevant knowledge for predictive ecological risk assessment.

Keywords

Creeping bentgrass, Agrostis stolonifera LMicrosatellite markerspopulation geneticsgene flowecological risk assessment
Type
Weed Biology and Ecology
Information
Weed Science , Volume 60 , Issue 4 , December 2012 , pp. 583 - 588
Copyright
Copyright © Weed Science Society of America 

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