Since " Allium " species are almost exclusively found in the Northern Hemisphere, with major centers of diversity in Central Asia and western North America, the biogeographical history of " Allium dregeanum " is of interest.
42.
The'cultigen'had most likely been spread by local people to the Caribbean and South America by 2500 BC . Strong supporting evidence was provided that the geographical zone postulated by Austin is the primary center of diversity.
43.
In 2009 the government of Mexico created a regulatory pathway for genetically modified maize, but because Mexico is the center of diversity for maize, gene flow could affect a large fraction of the world's maize strains.
44.
The contaminated seeds were collected from a region considered to be the world's center of diversity for corn _ exactly the kind of repository of genetic variation that environmentalists and many scientists had hoped to protect from contamination.
45.
Wild apple trees are still so prevalent in this so-called center of diversity that they constitute 40 percent of the native forest, said James Luby, an apple breeder and a professor of horticulture at the University of Minnesota.
46.
According to the current understanding of caiman evolutionary relationships, " Tsoabichi " is a basal member of Caimaninae and likely evolved after caimans dispersed into North America from northern and central South America, their main center of diversity in the Paleozoic.
47.
The oil-secreting lineages of Coryciinae are largely endemic to South Africa, with two centers of diversity : a summer-rainfall area centered in the Drakensberg range and a winter-rainfall area in the Western Cape province and Namaqualand ( Linder and Kurzweil 1999 ).
48.
In 2009 the government of Mexico created a regulatory pathway for approval of genetically modified maize, but because Mexico is the center of diversity for maize, concerns have been raised about the effect that genetically modified maize could have on local strains.
49.
The original study alarmed environmentalists because the native corn varieties were collected from a region considered to be the world's center of diversity for corn, exactly the kind of repository of genetic variation that many scientists had hoped to protect from genetically engineered DNA.
50.
Goodwin, a Department of Agriculture plant pathologist who teaches at Purdue University, had said that the potato family had two centers of diversity, one in Mexico and one in Peru, but that the blight itself was far more diverse in the Mexican center, so he theorized that it was likely to have evolved there.
