Extensive pollen flow in two ecologically contrasting populations of Populus trichocarpa

Authors: SLAVOV, G. T.; LEONARDI, S.¹; BURCZYK, J.²; ADAMS, W. T.³; STRAUSS, S. H.; DIFAZIO, S. P.⁴

Source: Molecular Ecology, Volume 18, Number 2, January 2009 , pp. 357-373(17)

Buy & download fulltext article:

Price: $48.00 plus tax (Refund Policy)

Abstract:

Pollen-mediated gene flow was measured in two populations of black cottonwood using direct (paternity analysis) and indirect (correlated paternity) methods. The Marchel site was an area with an approximate radius of 250 m in a large continuous stand growing in a mesic habitat in western Oregon. In contrast, the Vinson site was an area with a radius of approximately 10 km and consisted of small, disjunct and isolated stands in the high desert of eastern Oregon. Pollen immigration was extensive in both populations, and was higher in the Marchel site (0.54 ± 0.02) than in the substantially larger and more isolated Vinson site (0.32 ± 0.02). Pollen pool differentiation among mothers was approximately five times stronger in the Vinson population (φ_FT = 0.253, N = 27 mothers) than in the Marchel population (φ_FT = 0.052, N = 5 mothers). Pollen dispersal was modelled using a mixed dispersal curve that incorporated pollen immigration. Predicted pollination frequencies generated based on this curve were substantially more accurate than those based on the widely used exponential power dispersal curve. Male neighbourhood sizes (sensu Wright 1946) estimated using paternity analysis and pollen pool differentiation were remarkably similar. They were three to five times smaller in the Vinson population, which reflected the substantial ecological and demographic differences between the two populations. When the same mathematical function was used, applying direct and indirect methods resulted in similar pollen dispersal curves, thus confirming the value of indirect methods as a viable lower-cost alternative to paternity analysis.

Keywords: black cottonwood; correlated paternity; gene flow; microsatellites; parentage analysis; Populus

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1365-294X.2008.04016.x

Affiliations: 1: Dipartimento di Scienze Ambientali, Università di Parma, 43100 Parma, Italy 2: Department of Genetics, Bydgoszcz University, Bydgoszcz, 85064, Poland 3: Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR 97331-5752, USA 4: Department of Biology, West Virginia University, Morgantown, WV 26506-6057, USA

Publication date: 2009-01-01

Extensive pollen flow in two ecologically contrasting populations of Populus trichocarpa

Buy & download fulltext article:

Tools

Key

Text size:

Useful pages