Abstract
The occurrence of environmentally induced heritable changes in certain flax varieties has been shown to be accompanied by changes in the genomic DNA. A large difference in nuclear DNA contents has been characterized between the extreme types, termed genotrophs. The genomic variation between a series of genotrophs has been studied by the polymerase chain reaction using random arbitrary oligonucleotide primers. A total of 320 primers were used in the reactions and 253 polymorphic bands observed. The polymorphic bands were derived from all parts of the genome, namely the highly repetitive, middle-repetitive and low-copy-number sequences. They were also shown to be distributed thoughout the genome. In one group of genotrophs, all of which were induced by temperature treatment, there was a clustering of the polymorphisms with a high degree of shared polymorphisms. These results are in agreement with earlier studies showing that a dispersed fraction of the genome is susceptible to variation when environmentally induced heritable changes occur.
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Cullis, C.A., Swami, S. & Song, Y. RAPD polymorphisms detected among the flax genotrophs. Plant Mol Biol 41, 795–800 (1999). https://doi.org/10.1023/A:1006385606163
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DOI: https://doi.org/10.1023/A:1006385606163