| 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 |
| impact of combining planting date and chemical control to reduce larval densities of stem-infesting pests of sunflower in the central plains. | the guild of stem-infesting insect pests of sunflower, helianthus annuus l., within the central plains is a concern to producers chiefly due to losses caused by plant lodging from the sunflower stem weevil, cylindrocopturus adspersus (leconte) (coleoptera: curculionidae), and dectes texanus texanus leconte (coleoptera: cerambycidae). the incidence of a root boring moth, pelochrista womonana (kearfott) (lepidoptera: tortricidae), also has increased. experiments were conducted in three locations i ... | 2007 | 17849877 |