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(American Journal of Botany. 2002;89:551-558.)
© 2002 Botanical Society of America, Inc.

Genetics and Molecular Biology

Karyotypic studies in Turnera sidoides complex (Turneraceae, Leiocarpae)1

Viviana G. Solís Neffa2,3,5 and Aveliano Fernández2,4

2Instituto de Botánica del Nordeste (UNNE–CONICET), Casilla de Correo 209, 3400 Corrientes, Corrientes Province, Argentina; 3Facultad de Ciencias Agrarias (UNNE) 4Miembro de la Carrera del Investigador Científico (CONICET), Facultad de Ciencias Exactas y Naturales y Agrimensura (UNNE), Corrientes, Corrientes Province, Argentina

Turnera sidoides, with the most southerly distribution of all Turnera species in America, is a complex of obligately outcrossing perennial herbs. Karyotypes of the five subspecies of T. sidoides (x = 7) are described for the first time utilizing root-tip mitotic metaphases. Different ploidy levels were found for all of the subspecies, ranging from diploid to octoploid. The results obtained, coupled with available meiotic and preliminary biosystematic data, support the hypothesis of autopolyploidy within this species complex. Although detailed karyotype analysis shows a high degree of intraspecific uniformity, subspecies may be differentiated by the number, type, and position of satellites, suggesting that chromosome rearrangements may also be involved in the karyotypic evolution of T. sidoides. Karyotype data, coupled with morphological and anatomical features, suggest the removal of T. sidoides from series Leiocarpae.

Key Words: autopolyploidy • karyotype evolution • Leiocarpae • taxonomy • Turnera • Turneraceae




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S. Truyens, M. M. Arbo, and J. S. Shore
Phylogenetic relationships, chromosome and breeding system evolution in Turnera (Turneraceae): inferences from its sequence data
Am. J. Botany, October 1, 2005; 92(10): 1749 - 1758.
[Abstract] [Full Text] [PDF]


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