spike. Independent recessive mutations in each of these genes caused cell wall thickening in a highly specific grain zone’, converting the brittle floral axis (the rachis) of the wild-type into a tough, ‘disarticulation form that promoted grain retention. The authors hypothize that anthropogenic selection operated in of mutations in two adjacent complementary dominant genes, the products of which are suggestive of a signal transducing receptor and its protein ligand. The two genes products, BRT1 and BRT2, act together to control the cell wall thickening in the disarticulation zone of the rachis node through a molecular mechanism using comparative DNA sequence information and archaeo botanical data. The authors demonstrated independent origin of barley domestication. Two zones’’ were found, where major frequency changes between and occur: the btr1- btr2-types ‘‘transition region between Iran and Afghanistan and the Levant and the southern part of the Mediterranean Sea. Besides these two transition zones, were found to predominate in India and Ethiopia. While possible that btr1-types and barleys may be better adapted to different eco-climatic zones, an alternative scenario is that btr1- btr2-type their current distribution is a direct result of human migration.
spike. Independent recessive mutations in each of these genes caused cell wall thickening in a highly specific grain ‘disarticulation zone’, converting the brittle floral axis (the rachis) of the wild-type into a tough, form that promoted grain retention. The authors hypothize that anthropogenic selection operated in of mutations in two adjacent complementary dominant genes, the products of which are suggestive of a signal transducing receptor and its protein ligand. The two genes products, BRT1 and BRT2, act together to control the cell wall thickening in the disarticulation zone of the rachis node through a molecular mechanism using comparative DNA sequence information and archaeo botanical data. The authors demonstrated independent origin of barley domestication. Two ‘‘transition zones’’ were found, where major frequency changes between btr1- and btr2-types occur: the region between Iran and Afghanistan and the Levant and the southern part of the Mediterranean Sea. Besides these two transition zones, btr1-types were found to predominate in India and Ethiopia. While possible that btr1- and btr2-type barleys may be better adapted to different eco-climatic zones, an alternative scenario is that their current distribution is a direct result of human migration.
udda2atxt_coordinators_reports_pp4-31.docx