Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Wheat as a model system.

Abstract

Wheat as a model system for studying chromosome manipulation and the evolution of polyploids is examined under these headings: the polyploid nature of wheat is an advantage in chromosome manipulation studies; strictly homologous chromosome pairing is controlled by specific sets of genes; chromosome manipulation in wheat is facilitated by its wide tolerance of aneuploidy; the addition of alien chromosomes to wheat has revealed unusual chromosome behaviour; the manipulation of chromosomes in wheat has been widely exploited for agronomic improvement; the genome structure of wheat includes a large number of repetitive DNA sequence families; the genetic mapping of hexaploid wheat; chromosome banding procedures provide landmarks that can be incorporated into genetic maps; mapping the large genome of wheat is made simpler by mapping diploid progenitor species; the evolution of wheat is closely linked to its domestication; the relatively recent evolution of wheat means that extant diploid progenitors can be identified; the adaptive value of polyploid wheats; the Rht [reduced height] genes were important in the more recent domestication of wheat; and wheat domestication - prospects.