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(American Journal of Botany. 2006;93:226-233.)
© 2006 Botanical Society of America, Inc.

Reproductive Biology

Effect of flowering phenology on pollen flow distance and the consequences for spatial genetic structure within a population of Primula sieboldii (Primulaceae)1

Naoko Kitamoto2, Saneyoshi Ueno3, Akio Takenaka4, Yoshihiko Tsumura3, Izumi Washitani5 and Ryo Ohsawa2,6

2Laboratory of Plant Breeding, Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan; 3Genome Analysis Laboratory, Department of Forest Genetics, Forestry and Forest Products Research Institute, Tsukuba 305-8687, Japan; 4Environmental Biology Division, National Institute for Environmental Studies, Tsukuba 305-0053, Japan; 5Laboratory of Conservation Ecology, Department of Ecosystem Studies, Graduate School of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 311-8657, Japan

ABSTRACT

To evaluate the effects of flowering phenology on pollen flow distance and spatial genetic structure in a population of a bumblebee-pollinated herb, Primula sieboldii, we investigated the flowering phenology of 1712 flowers of 97 genets in a population in Nagano Prefecture, Japan, and constructed a mating model based on the observed mating pattern, which was revealed by paternity analysis using 11 microsatellite markers. The effects of flowering phenology were inferred by comparing estimated pollen flow distance and the level of heterozygosity in the next generation between two scenarios. In the first scenario, both the intergenet distance and flowering phenology influenced mating opportunity, while in the second scenario only intergenet distance influenced mating opportunity. Although the frequency distribution of pollen flow distance at the population level did not differ significantly between the two scenarios, the mean pollen flow distance of several flowers increased by more than 10 m as a result of variation in flowering phenology. Furthermore, accounting for flowering phenology predicted change in heterozygosity in the next generation from –0.04 to 0.07. The results showed that flowering phenology can affect pollen flow distance and spatial genetic structure.

Key Words: bumblebee • flowering time • heterostyly • mating model • microsatellite • Nagano Prefecture • paternity analysis • Primulaceae




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Flowering Newsletter bibliography for 2006
J. Exp. Bot., April 20, 2007; (2007) erm028v2.
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