First, genetic diversity is a general characteristic of nature and its organisms that seems to be a security for the future, a means for the adaptation to changing environmental conditions. Genetic diversity in general can be divided into the diversity between species and the diversity within species.
Genetic diversity is also a constituent of agricultural systems all over the world.
Regional breeds and plant landraces are more or less a result of human and natural selection processes over thousands of years. In many cases this threat is caused by the success of green revolution. This loss of genetic diversity, called genetic erosion , has reduced the diversity between as well as within many of the crop species. The problem was strengthened by the farm specialization. Together with the wild relatives of our breeds and crops all over the world, this diversity forms the pool of genetic resources .