Farrar, Donald , Stensvold, Mary Clay .
Genotype influences migratory ability in Botrychium.
European and American genotypes of Botrychium lunaria sl are fixed for different alleles at 4 of 22 loci as determined by enzyme electrophoresis. The European genotype ranges across Eurasia and into the Aleutian Islands, interior Alaska and Yukon Territory where it overlaps the range of the American genotype. A secondary zone of sympatry in far eastern Canada possibly results from migration of the European genotype from Greenland. F1 hybrids between the two genotypes are rare, but in both sympatric areas introgressed populations indicate that hybridization has occurred. Segregation from F1 hybrids followed by intragametophytic selfing results in plants that display interlocus heterozygosity but intralocus homozygosity. With regard to the 4 unshared alleles, 13 of 14 possible interlocus heterozygotes have been detected within the zones of sympatry. Plants of all genotypes appear robust and produce apparently viable spores of the same size, but only three genotypes are common and only two have migrated significantly beyond the zones of sympatry. Surprisingly, one of these genotypes has become the most widespread of all Botrychium taxa and the only taxon to have migrated to the southern hemisphere. We conclude that in these plants, genotype strongly influences migratory ability, either through restricted adaptability to new environments or through altering physiological tolerance of the rigors of long distance transport.
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1 - Iowa State University, Department of Ecology, Evolution & Organismal Biology, 253 Bessey Hall, Ames, Iowa, 50011-1020, USA
2 - USDA Forest Service, Alaska Region, 204 Siginaka Way, Sitka, Alaska, 99835, U.S.A.
Presentation Type: Oral Paper:Papers for Sections
Date: Monday, July 28th, 2008
Time: 9:45 AM