Karyotype differentiation in three species of Tripogandra Raf. (Commelinaceae) with different ploidy levels
| Autor: | Fernando Roa, Marcelo Guerra, André Marques |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Tripogandra
food.ingredient lcsh:QH426-470 Heterochromatin Short Communication CMA/DAPI bands CMA Plant Genetics food Meiosis Botany Genetics meiosis Molecular Biology Cytotaxonomy cytotaxonomy biology Chromosome Karyotype Commelinaceae biology.organism_classification lcsh:Genetics Evolutionary biology rDNA sites Ploidy |
| Zdroj: | Genetics and Molecular Biology, Volume: 33, Issue: 4, Pages: 731-738, Published: 15 OCT 2010 Genetics and Molecular Biology Genetics and Molecular Biology, Vol 33, Iss 4, Pp 731-738 (2010) Genetics and Molecular Biology v.33 n.4 2010 Sociedade Brasileira de Genética (SBG) instacron:SBG |
| ISSN: | 1678-4685 1415-4757 |
| DOI: | 10.1590/s1415-47572010005000085 |
| Popis: | Most species of the genus Tripogandra (Commelinaceae) are taxonomically poorly circumscribed, in spite of having a relatively stable basic number x = 8. Aiming to estimate the cytological variation among Tripogandra species carrying this base number, several structural karyotypic characters were investigated in the diploid T. glandulosa, the hexaploid T. serrulata, and the octoploid T. diuretica. A careful evaluation of chromosome size and morphology did not reveal clear chromosome homeologies among karyotypes. The mean chromosome size was strongly reduced in the octoploid species, but not in the hexaploid species. They also differed largely in the CMA(+) banding pattern and in the number of 5S and 45S rDNA sites per monoploid chromosome complement. All three species showed proximal DAPI (+) heterochromatin, although in T. serrulata this kind of heterochromatin was only visible after FISH. Further, the meiosis in T. serrulata was highly irregular, suggesting that this species has a hybrid origin. The data indicate that, in spite of the conservation of the base number, these species are karyologically quite different from each other. |
| Databáze: | OpenAIRE |
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