| life form-specific gradients in compound-specific hydrogen isotope ratios of modern leaf waxes along a north american monsoonal transect. | the use of hydrogen isotope ratios (δ(2)h) of sedimentary n-alkanes from leaf waxes has become an important tool for reconstructing paleoenvironmental and ancient hydrologic conditions. studies of modern plant waxes can elucidate driving ecological mechanisms behind geologic deposits. here, we used a transect across the north american monsoon region of the western usa from tucson, arizona to salt lake city, utah to study variations in leaf wax δ(2)h among co-occurring plants. three co-occurring ... | 2015 | 26310435 |
| natural variation in gene expression between wild and weedy populations of helianthus annuus. | the molecular genetic changes underlying the transformation of wild plants into agricultural weeds are poorly understood. here we use a sunflower cdna microarray to detect variation in gene expression between two wild (non-weedy) helianthus annuus populations from utah and kansas and four weedy h. annuus populations collected from agricultural fields in utah, kansas, indiana, and california. when grown in a common growth chamber environment, populations differed substantially in their gene expre ... | 2008 | 18689879 |
| selective sweeps reveal candidate genes for adaptation to drought and salt tolerance in common sunflower, helianthus annuus. | here we report the results of an analysis of variation at 128 est-based microsatellites in wild helianthus annuus, using populations from the species' typical plains habitat in kansas and colorado, as well as two arid desert and two distinct brackish marsh areas in utah. the test statistics lnrv and lnrh were used to find regions of the genome that were significantly less variable in one population relative to the others and thus are likely to contain genes under selection. a small but detectabl ... | 2007 | 17237516 |