Karyotypes of South American species of the Morelloid and Dulcamaroid clades (Solanum, Solanaceae).

MOYETTA, NATALIA R.; STIEFKENS, LAURA B.; BERNARDELLO, G

UNIV FLORENCE BOTANY INST

Lugar: Florencia; Año: 2013 p. 1 - 1

bstract: A karyotypic study on South American representatives of the Morelloid and Dulcamaroid clades of Solanum was conducted to contribute to a better understanding of their relationships. Mitotic chromosomes of 26 species were examined (16 of which were previously unknown). All taxa presented 2n=2x=24 and had small chromosomes (less than 4 µm long). Most species displayed symmetrical karyotypes, being 78% and 69% m, 19% and 25% sm or 3% and 6% st for the Morelloid and Dulcamaroid clades, respectively. Solanum crispum (Dulcamaroid clade) was unique by having mostly sm chromosomes and S. sinuatirecurvum (Morelloid clade) stood out with 4 st pairs and an exclusive pair of satellites in long arms. Solanum tripartitum was the sole entity exhibiting a sm pair with satellites. The cytogenetic characterization of Morelloid and Dulcamaroid clades is discussed and can reinforce the systematic arrangement of the taxa based on morphological and molecular studies.