Análisis de la meiosis y viabilidad del polen en morfotipos intraespecíficos de Cuscuta paradiana (Cuscutaceae)

Abstract

In family Cuscutaceae the Cuscuta genus comprises holo-parasitic plants that have cosmopolitan distribution. The genus includes three subgenera: Cuscuta , Monogyna and Grammica ; the last one is widely distributed in the American continent. In this work, flower morphology, meiotic studies and pollen viability of 4 natural populations of Cuscuta parodiana subgenus Grammica are presented. The flower morphology allow us to differentiate 4 morpho- types through corolla and gynoecium traits. Three entities analyzed were tetraploids (n = 30), and one was of them diploid (n = 15). Trivalent and tetravalent chromosomal configurations, chromatin bridges, chromosomes outside of metaphasic plate, cytomixis and extranuclear spherical bodies were observed during meiosis