Pollen-style compatibility relations in natural populations of the wild diploid potato species Solanum spegazzinii Bitt. |
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Authors: | Luis Ernesto Erazzú Elsa Lucila Camadro Andrea Martina Clausen |
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Institution: | (1) Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), C.C. 9, 4101 Las Talitas, Tucumán, Argentina;(2) Estación Experimental Agropecuaria (EEA) Balcarce, Instituto Nacional de Tecnología Agropecuaria (INTA) – Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata (UNMdP), and CONICET, C.C. 256, 7620 Balcarce Buenos Aires, Argentina;(3) EEA Balcarce, INTA, C.C. 256, 7620 Balcarce, Buenos Aires, Argentina |
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Abstract: | Solanum spegazzinii Bitt., a wild diploid potato species endemic to Argentina, possesses resistance to adverse biotic and
abiotic agents. Northwestern Argentinean populations grouped according to their morphological variability (G1 = localities
East of the Calchaquí Valley, G2 = Calchaquí Valley and G3 = locality Belén) presented problems in seed set following controlled
crosses. Thus, to evaluate if the morphological variability previously reported was sustained on a genetic basis, three introductions
per group and five plants per introduction were used in controlled crosses (genotypic combinations). These were classified
according to the number of seeds produced per fruit. Pollen-style compatibility relations were studied in those crosses that
did not set seeds or that produced less than 30 seeds each. Within groups, G1 produced seeds normally, whereas hybridization
barriers were found in 71.4% and 50.0% of the combinations within G2 and G3, respectively; on the other hand, from 46.7% to
73.3% of the combinations among groups exhibited similar barriers. Variability in the expression of the sites of pollen tube
inhibition in the style was observed both within and among groups. Speculations are made on the possible hybrid origin of
the populations.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | pollen-style compatibility sexual polyploidization Solanum spegazzinii wild potato germplasm |
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