Journal
MOLECULAR ECOLOGY
Volume 11, Issue 9, Pages 1703-1715Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-294X.2002.01557.x
Keywords
Helianthus; hybridization; hybrid speciation; phylogeography; recurrent speciation; sunflowers
Funding
- NIGMS NIH HHS [GM59065] Funding Source: Medline
Ask authors/readers for more resources
The recurrent origin of diploid hybrid species is theoretically improbable because of the enormous diversity of hybrid genotypes generated by recombination. Recent greenhouse experiments, however, indicate that the genomic composition of hybrid lineages is shaped in part by deterministic forces, and that recurrent diploid hybrid speciation may be more feasible than previously believed. Here we use patterns of variation from chloroplast DNA (cpDNA), nuclear microsatellite loci, cross-viability and chromosome structure to assess whether a well-characterized diploid hybrid sunflower species, Helianthus anomalus , was derived on multiple occasions from its parental species, H. annuus and H. petiolaris . Chloroplast DNA and crossability data were most consistent with a scenario in which H. anomalus arose three times: three different H. anomalus fertility groups were discovered, each with a unique cpDNA haplotype. In contrast, there was no clear signature of multiple, independent origins from the microsatellite loci. Given the age of H. anomalus (> 100 000 years bp), it may be that microsatellite evidence for recurrent speciation has been eroded by mutation and gene flow through pollen.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available