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Abstract Detail


Molecular Ecology and Evolution

Miller, Jill S. [1], Dhond, Mukta [1], Bernardello, Gabriel [2].

Gametophytic self-incompatibility in Lycium cestroides (Solanaceae) from Argentina.

Genetically controlled self-incompatibility systems have evolved repeatedly among angiosperm species and are well established as mechanisms to avoid self-fertilization and prevent inbreeding depression. In gametophytic self-incompatibility (GSI), two separate but tightly linked genes at the S-locus control the recognition reaction. The first is the S-RNase gene, which is expressed in the pistil. The second, more recently described gene is the SLF gene and it is expressed in the haploid pollen grain. When the haploid S-genotype of the pollen grain matches that of either of the two S-RNases expressed in the pistil of the maternal parent, pollen tube growth is terminated and fertilization fails. Given this genetic control, offspring following successful fertilization are necessarily heterozygous. Further, negative frequency-dependence shelters rare alleles from extinction and creates strong selection for novel alleles; both of these factors result in the maintenance of large numbers of S-alleles within self-incompatible populations. Here, we characterize allelic diversity at the S-RNase gene in two populations of Lycium cestroides Schltdl. (Solanaceae), a South American member of this cosmopolitan genus. Specifically, we genotype individuals and assess heterozygosity within populations, compare allelic diversity among populations, and investigate patterns of molecular evolution at theS-RNase locus. We also confirm allele specificities between plants of known S-RNase genotypes using controlled crosses in natural populations.


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Miller lab website


1 - Amherst College, Department of Biology, Mcguire Life Sciences Building, Amherst, Massachusetts, 01002, USA
2 - Universidad De Cordoba, Instituto Multidisciplinario De Biologia Vegetal (Imbiv), Museo Botanico, Casilla De Correo 495, Cordoba, 5000, Argentina

Keywords:
self-incompatibility
Lycium
mating systems
Solanaceae
S-RNase.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P74007
Abstract ID:2024


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