Meiotic studies and pollen viability in three species of Tibouchina (Melastomataceae)
Keywords:
Chromosomes, meiosis, polyploidy, Tibouchina alpestris, T. longifolia, T. paratropicaAbstract
Andrada, Aldo R.; Valeria de los A. Páez. 2014. “Meiotic studies and pollen viability in three species of Tibouchina (Melastomataceae)”. Lilloa 51 (2). The genus of the Melastomataceae family Tibouchina contains about 350 described species. The available cytogenetic information in this genus is related to chromosome counts in only 10% of its species. Several chromosome numbers have been proposed, with a probable basic number of x = 9, although x = 7 and x =12 cannot be ruled out. In this study a cytological analysis of three species of Tibouchina was made: T. alpestris, T. longifolia and T. paratropica. The chromosome complement, meiotic behavior during division of pollen mother cells and the estimation of the viability of the meiotic products were analyzed. The analysis performed by conventional cytogenetic techniques determined that T. alpestris is a diploid with n = 9, while T. paratropica and T. longifolia are tetraploids with n = 18. In the studied species the pollen viability was upper to 90%.
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