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(American Journal of Botany. 2009;96:1138-1147.)
doi: 10.3732/ajb.0800173
© 2009 Botanical Society of America, Inc.
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Population Biology

Fine-scale genetic structure enhances biparental inbreeding by promoting mating events between more related individuals in wild soybean (Glycine soja; Fabaceae) populations1

Ru Zhao, Hanbing xia and Bao-rong Lu2

Ministry of Education, Key Laboratory for Biodiversity Science and Ecological Engineering, Department of Ecology and Evolutionary Biology, Fudan University, Handan Road 220, Shanghai 200433, China

ABSTRACT

Outcrossing between genetically distant individuals in a plant population enhances allelic heterozygosity—an important source for genetic diversity and adaptive evolution. Fine-scale spatial genetic structure (FSGS) can interfere with outcrossing by promoting mating between more related individuals. To test the influence of FSGS on outcrossing, FSGS and outcrossing rates were analyzed with four wild soybean (Glycine soja) populations from different habitats, using simple sequence repeat (SSR) fingerprints. Spatial autocorrelation analysis indicated variable FSGS (15.44–25.87 m) in all four populations. Multilocus mixed-mating analysis of 1605 progeny indicated substantial variation in single-locus outcrossing (Ts = 6.3–12.6%) although the total outcrossing rates as estimated by multilocus outcrossing (Tm = 12.8–17%) did not vary significantly among populations. The comparison between FSGS and outcrossing rates demonstrated that strong FSGS with large genetic patch size can enhance biparental inbreeding by promoting mating between more related individuals in a population. The results suggest that patch size management can aid in situ conservation by avoiding formation of strong FSGS and encouraging true outcrossing among individuals.

Key Words: Fabaceae • genetic diversity • Glycine soja • heterozygosity • mating pattern • microsatellite • spatial genetic structure • wild soybean

Received for publication 19 May 2008. Accepted for publication 20 February 2009.

FOOTNOTES

1 The authors acknowledge financial support from the Chinese Ministry of Science and Technology (973 Program, Grant No. 2006CB100205).

2 Author for correspondence (e-mail: brlu{at}fudan.edu.cn)


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