Summary
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1.
A comparative morphological, histological, and cytological study of the tumors caused by Bacterium tumefaciens, spontaneous tumors on hydrid plants and of the tumors produced by various chemicals is presented.
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2.
Some physiological moments have been also considered.
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3.
The tumors produced by Bacterium tumefaciens are similar in structure to the spontaneous tumors on hybrid plants and to those produced by various chemicals.
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4.
Bacterium tumefaciens causes polyploidy, therefore it is considered as an important agent participating in the process of the origin of species.
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5.
An attempt is made to interprete the etiology of tumors in connection with the studies presented here and in consideration of some previous investigations.
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Kostoff, D., Kendall, J. Studies on plant tumors and polyploidy produced by bacteria and other agents. Archiv. Mikrobiol. 4, 487–508 (1933). https://doi.org/10.1007/BF00407557
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DOI: https://doi.org/10.1007/BF00407557