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Abstract Detail

Population Genetics

Barriball, Kelly [1], Goodell, Karen [2], Rocha, Oscar [1].

Mating Structure of the invasive shrub Lonicera Maackii: a comparison of shrubs in the edge and the interior of woodlots.

It has been documented that the abundance and composition of insect communities visiting flowers of the invasive shrub Lonicera maackii differ between plants growing along the edge of a woodlot and those growing in the interior of invaded woodlots. Higher visitation and pollen deposition to flowers along the edge than interior, but similar levels of pollen limitation in the two habitats suggest a predominantly outcrossing plant in which seed production is limited by pollen quality along the woodlot edges. In order to determine how differences in the pollinator communities affect the reproduction of L.maackii, we compared the mating structure of plants growing along the edge and in the interior of invaded woodlots. Five microsatellite marker loci were used to determine the outcrossing rate, level of biparental inbreeding, and the effective number of pollen donors siring the seed crop of this species. Our findings support the notion that L. maackii is a predominantly outcrossing plant (tm = 0.97), and there are no significant differences between the outcrossing rates among edge and interior plants. In addition, we found similar levels of biparental inbreeding among edge and interior plants (tm-ts = 0.124 ±0.016, tm-ts = 0.140 ± 0.019, respectively). However, there were significant differences in the correlation of paternity among progeny of? edge and interior plants (rp = 0.175 ± 0.020, rp = 0.120 ± 0.020, respectively), suggesting differences in the average number of pollen donors siring their seed crop. The effective number of pollen donors (Nep) was lower for edge than interior plants (AOV, F1, 35 = 9.80, p < 0.035), where Nep ranged between 1.78 to 12.01 (average Nep = 7.42 ± 0.66) for edge plants and between 3.54 to 34.09 (average Nep = 12.02 ± 1.89) for interior plants. We also found significant heterogeneity in allele frequencies among pollen and ovule for both edge and interior plants. Moreover, pollen pool frequency estimates for edge plants were significantly different from those of interior plants, suggesting habitat-specific pollen flow? We argue that in pollen frequencies and number of sires are most likely due to the disparities in visitor community, the time and intensity of flower anthesis among pollen donors, and non-random mating of genotypes during outcrossing events. We discussed the impacts of these findings on the reproductive biology of this invasive species, and we also examined the consequences of our results in light of the genetic structure and diversity of L.maackii populations.

Broader Impacts:

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1 - KENT STATE UNIVERSITY, Department Of Biological Sciences, 256 CUNNINGHAM HALL, KENT, OH, 44242, USA
2 - Ohio State University, Department of Evolution, Ecology and Organismal Biology, 1179 University Drive, Newark,, OH, 43055, USA

plant mating systems
genetic diversity
fruit abortion
invasive species
pollen limitation.

Presentation Type: Oral Paper:Papers for Topics
Session: 28
Location: Delaware B/Hyatt
Date: Tuesday, July 10th, 2012
Time: 11:15 AM
Number: 28011
Abstract ID:986

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