Chromosome numbers and meiotic analysis in three species of Tropaeolum (Tropaeolaceae)
Tropaeolum (Tropaeolaceae) comprises approximately 100 species mainly distributed from México to South of Argentina and Chile. Fifteen species inhabit in Argentina at 700-3500 m altitude. Chromosome counts in this genus indicate a constant basic chromosome number x = 14. In this paper, three species widespread in the Northwestern of Argentina were cytogenetically studied: T. argentinum, T. atrocapillare and T. capillare. Flower buds were treated by classical cytogenetical techniques. The gametophytic chromosome number from the three species here analysed was n = x = 14. During cell division, secondary chromosomic associations and a lot of irregularities were observed such as lagging chromosomes, chromatin bridges and unbalanced segregations. Our results, which highlight the diploid character in taxa from this region, disclose the first cytological studies of these species.
Copyright (c) 2019 Aldo Rubén Andrada, Valeria de los Ángeles Páez, Eva Bulacio
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication.
- The articles in this journal are published under Creative Commons Attribution-NonCommercial 4.0 International License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories, on their website or ResearchGate) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (SeeThe Effect of Open Access).