Summary
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1.
Distances have been calculated between thirty natural populations of Vicia faba.
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2.
The results strongly suggest the existence of a Central Nucleus from which different trends of evolution have arisen.
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3.
The Central Nucleus represents the equilibrium between different genetic tendencies; this equilibrium is postulated for the primitive populations of this species.
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4.
Disturbance of this balanced system can be produced by cycles of cross and self-fertilization; recombinations following these cycles are the origin of new genetic combinations so that a new equilibrium is reached with a new cycle of disturbance.
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5.
The Muratova classification is discussed. It is not possible to give a new classification based on these concepts, because of the great number of possible lines of evolution. The species must be considered as a whole, because there are no genetic barriers of isolation, only geographical ones and no sterility barriers have been produced between the subspecies.
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6.
A description of the Central Nucleus of Evolution is given.
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Communicated by W. Seyffert and H. Stubbe
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Cubero, J.I. Evolutionary trends in Vicia faba L.. Theoret. Appl. Genetics 43, 59–65 (1973). https://doi.org/10.1007/BF00274958
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DOI: https://doi.org/10.1007/BF00274958