Summary
Evidence is provided that hybridization of the tetraploid (2n=4x=48), self-fertile tuber-bearing species Solanum acaule Bitt. with the diploid (2n=2x=24), self-incompatible, tuber-bearing S. megistacrolobum Bitt. takes place in several localities of the province of Jujuy in the high, cold plateaux of the Argentine Puna. The triploid hybrids (2n=3x=36) closely resemble S. acaule in growth habit, leaf morphology and floral structures and for this reason they can be easily overlooked for that species in the field. Experimental data show that S. acaule can be crossed with S. megistacrolobum though the crossability is rather low and variable according to the particular cross considered. The artificial hybrid obtained compares well with the natural hybrid in morphology and chromosome number. The hybrids, though almost completely male sterile, are successful colonizers of disturbed areas around farmers' dwellings, cattle enclosures and other areas where the soil is rich in organic matter.
There is some evidence that the Tilcara material of S. acaule subsp. aemulans and the hybrids of S. acaule x S. megistacrolobum have some characters in common, which can be interpreted as having a similar origin.
It is postulated that S. acaule subsp. aemulans, in Jujuy at any rate, is not a primitive form of S. acaule as thought by Hawkes and Hjerting, but rather a fertile hybrid derivative of S. acaule x S. megistacrolobum through the functioning of 2n gametes.
We also provide evidence that S. bruecheri Correll should not be considered a hybrid of S. acaulle x S. megistacrolobum but a synonym for S. gourlayi Hawkes. The new name, S. x indunii Okada et Clausen, is proposed to designate this hybrid.
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References
Brücher, H., 1959. Kritische Betrachtungen zur Nomenklatur argentinischer wild Kartoffeln. V. Die Serie Acaulia. Züchter 29: 149–156.
Bukasov, S. M. & A. J. Kameraz, 1959. (bases of Potato Breeding). Moscow.
Cabrera, A. L., 1957. La vegetación de la Puna argentina. Revista Investigaciones Agrícolas, 11: 317–512.
Cabrare, A. L., 1971. Fitogeografia de la República Argentina. Boletín Sociedad Argentina Botánica. 14: 1–42.
Correll, D. S., 1961. New species and some nomenclatural changes in Section Tuberarium of Solanum. Wrightia 2: 169–197.
Correll, D. S., 1952. The potato and its wild relatives. Texas Research Foundation No 4.
Davis, P. H. & V. H., Heywood, 1963. Principles of Angiosperm taxonomy. Oliver and Boyd, Edinburg/London.
Hawkes, J. G. & J. P. Hjerting, 1969. The potatoes of Argentina, Brazil, Paraguay and Uruguay. Ann. Bot. Memoir No 3. Oxford.
Hawkes, J. G., 1979. Evolution and polyploidy in potato species. In: Hawkes, J. G., R. N. Lester & A. D. Skelding (Eds), Evolution and polyploidy in potato species. pp. 637–646. Linnean Society Symposium Series No 7.
Okada, K. A., 1976. Exploration, conservation and evaluation of potato germplasm in Argentina. Potato Research 19: 263–269.
Ruthsatz, B. & C. P., Movia, 1975. Relevamiento de las estepas andinas del noroeste de la provincia de Jujuy. Fundación Educación, Ciencia y Cultura, Buenos Aires.
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Okada, K.A., Clausen, A.M. Natural hybridization between Solanum acaule Bitt. and S. megistacrolobum Bitt. in the province of jujuy, Argentina. Euphytica 31, 817–835 (1982). https://doi.org/10.1007/BF00039223
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DOI: https://doi.org/10.1007/BF00039223