Abstract
The environment has been shown to induce heritable changes in three plant systems, namely flax, Nicotiana rustica, and soybean cell suspension cultures. Changes in nuclear DNA sequences associated with the induction phenomenon have been demonstrated in both flax and soybean. In flax, which has been most extensively studied, the overall variation in the nuclear DNA is described together with a number of transcribed and nontranscribed sequences which have been shown to vary. Possible mechanisms by which the observed DNA changes could arise are discussed and the phenomenon of environmentally induced DNA variation compared with examples of gene amplification or deletion in other systems.
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