Abstract
Cytogeographical variability among 564 plants from 26 populations of Turnera sidoides subsp. pinnatifida in mountain ranges of central Argentina was analysed with meiotic chromosome counts and flow cytometry and is described at regional and local scales. Populations were primarily tetraploids (2n = 4x = 28), although diploid (2n = 2x = 14), hexaploid (2n = 2x = 42), and mixed populations of diploids and triploids (2n = 3x = 21) were also found. Diploids, triploids, and hexaploids were fewer in number and restricted to narrow areas, while tetraploids were the most common and geographically widespread cytotype. Diploids grew at higher altitudes and in colder and wet locations; tetraploids had the broadest ecological spectrum, while hexaploids occurred at the lowest altitudes and in drier conditions. The cytotypes were also spatially segregated at a microgeographical scale. Diploids grew in the piedmont, tetraploids were in the adjacent valley, and in the contact zone of both cytotypes, patches of diploids and triploids were found. At a regional scale, the distribution of the cytotypes may be governed by a combination of ecological and historical variables, while segregation in the contact zone may be independent of the selective environment because the cytotypes are unable to coexist as a result of reproductive exclusion. The role of triploids is also discussed.
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Acknowledgments
This research was partially supported by grants from the Agencia Nacional de Promoción Científica, Tecnológica y de Innovación (ANPCyT-FONCyT, PICT 01-14674, PICTO 07-90), CONICET (PIP 5998) and Secretaría General de Ciencia y Técnica (UNNE, PI-013/04). G. Elías and M. Sartor are Doctoral Fellows of the National Research Council of Argentina (CONICET), and V. G. Solís Neffa is a member of the Carrera del Investigador Científico of CONICET.
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Elías, G., Sartor, M. & Solís Neffa, V.G. Patterns of cytotype variation of Turnera sidoides subsp. pinnatifida (Turneraceae) in mountain ranges of central Argentina. J Plant Res 124, 25–34 (2011). https://doi.org/10.1007/s10265-010-0347-0
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DOI: https://doi.org/10.1007/s10265-010-0347-0