Summary
Injection of exogenous barley donor DNA into grains of barley recipient plants at the milk maturity stage, with a specially designed syringe, led to the appearance of transformed plants. The transformation (in rare cases) was caused by the unsheared DNA since the DNA passing through the syringe needle remained relatively stable (106 to 107 daltons) as was confirmed by DNA sedimentation analysis.
14 plants grown from seeds injected with highly polymeric DNA containing close to 30 per cent protein had transformed pollen grains. In the 2nd generation only 2 plants from the 8 studied preserved these changes. In the progeny of these two plants, i.e., in the 3rd seed generation after injection, 82.1 per cent of plants preserved the transformed characters. The next, 4th generation, preserved a transformed phenotype in 89.6 per cent of plants.
It was also shown that reversion to a recipient-like state was not always constant. We found the reversion of transformed properties (i.e., normal starch and two-rowed spikes) in 40 per cent of the 4th generation descendants of one of the plants which had lost the phenotypical expression of these properties in the 3rd generation but had them in the 2nd generation.
The study of the morphological properties of transformed plants showed that with respect to phenotypic expression some characters were changed towards the donor type, some remained as in the recipients and some were of the intermediate type.
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Soyfer, V.N. Hereditary variability of plants under the action of exogenous DNA. Theoret. Appl. Genetics 58, 225–235 (1980). https://doi.org/10.1007/BF00288441
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DOI: https://doi.org/10.1007/BF00288441