World\92s major cereals share common ancestry
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CTA. 1994. World?s major cereals share common ancestry . Spore 52. CTA, Wageningen, The Netherlands.
Permanent link to this item: http://hdl.handle.net/10568/49440
Work in Britain and Japan has shown that the order of the genes of the chromosomes of wheat and rice, which diverged some 60 million years ago, is essentially the same. Preparing gene maps is a very costly exercise with no certain outcome, but this...
Work in Britain and Japan has shown that the order of the genes of the chromosomes of wheat and rice, which diverged some 60 million years ago, is essentially the same. Preparing gene maps is a very costly exercise with no certain outcome, but this particular finding is of immense importance. Less than half of the small genome of rice consist of repeated DNA sequences; but 90% of the huge wheat genome which is many times the size of the human genome, has been found to consist of repeats. Six of wheat\92s seven chromosomes in rice. The remaining four chromosomes in rice can all be rived from wheat chromosomes. The ancestral cereal genome of some 60 million years ago can now be reconstructed, and it has been shown that the genes of all the major cereals including rice, wheat, sorghum, maize, rye, oats and barley, can be placed on a single map. This suggests that genes for disease resistance, photoperiodism, drought tolerance and storage proteins, for instance, can be transferred among and between all the major cereals. There is a possibility that generic disease resistance breeding. It seems certain that possibilities that are now being opened up for transferring genes and knowledge between species will eventually give rise to more stable yields in all the major cereal crops of the world. 'New Scientist' no. 1918 (26 March 1994) IPC Specialist Group King\92s Reach Tower, Stamford Street London SE1 9LS, UK