TY - JOUR
T1 - Genetic variation in Bromus tectorum (Poaceae)
T2 - population differentiation in its North American range
AU - Novak, S. J.
AU - Mack, R. N.
AU - Soltis, D. E.
PY - 1991
Y1 - 1991
N2 - Allelic variation in seedlings from 60 North American populations of the alien annual grass Bromus tectorum was determined at 25 loci. Populations were collected from E of the Rocky Mountains, Nevada/California, the Intermountain West, and British Columbia. Compared to other diploid seed plants, genetic variation within these populations of B. tectorum is low: 4.60% of loci are polymorphic per population, with an average of 1.05 alleles per locus and a mean expected heterozygosity of 0.012. No heterozygous individuals were detected. The mean genetic identity (Nei's I) between population pairs was 0.980 and indicates a high level of overall genetic similarity among populations. The among-population component of the total gene diversity is high (GST = 0.478), indicating substantial genetic differentiation among populations. Results are consistent with previous reports for highly self-pollinating plants of low genetic variation and substantial genetic differentiation among populations. Despite the lack of genetic variation, this weedy grass has become exceedingly abundant in a diverse array of arid environments throughout much of W North America, perhaps due to phenotypic plasticity. -from Authors
AB - Allelic variation in seedlings from 60 North American populations of the alien annual grass Bromus tectorum was determined at 25 loci. Populations were collected from E of the Rocky Mountains, Nevada/California, the Intermountain West, and British Columbia. Compared to other diploid seed plants, genetic variation within these populations of B. tectorum is low: 4.60% of loci are polymorphic per population, with an average of 1.05 alleles per locus and a mean expected heterozygosity of 0.012. No heterozygous individuals were detected. The mean genetic identity (Nei's I) between population pairs was 0.980 and indicates a high level of overall genetic similarity among populations. The among-population component of the total gene diversity is high (GST = 0.478), indicating substantial genetic differentiation among populations. Results are consistent with previous reports for highly self-pollinating plants of low genetic variation and substantial genetic differentiation among populations. Despite the lack of genetic variation, this weedy grass has become exceedingly abundant in a diverse array of arid environments throughout much of W North America, perhaps due to phenotypic plasticity. -from Authors
UR - http://www.scopus.com/inward/record.url?scp=0026345550&partnerID=8YFLogxK
U2 - 10.2307/2444902
DO - 10.2307/2444902
M3 - Article
AN - SCOPUS:0026345550
SN - 0002-9122
VL - 78
SP - 1150
EP - 1161
JO - American Journal of Botany
JF - American Journal of Botany
IS - 8
ER -