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A triploid cytotype of Echinodorus tennellus
Costa, J.Y.; Forni-Martins, E.R. (2004). A triploid cytotype of Echinodorus tennellus. Aquat. Bot. 79(4): 325-332. dx.doi.org/10.1016/j.aquabot.2004.05.004
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770, more
Peer reviewed article  

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Keywords
    Chromosomes; Polyploidy; Alismataceae Vent. [WoRMS]; Echinodorus tennellus; ASW, Brazil, Sao Paulo [Marine Regions]

Authors  Top 
  • Costa, J.Y.
  • Forni-Martins, E.R., correspondent

Abstract
    We describe the existence of two Echinodorus tennellus cytotypes, with diploid populations, of 2n=22 chromosomes, and triploid ones, with 2n=33. Meiotic studies showed abnormalities and 50% pollen stainability in plants of triploid populations, but 100% pollen stainability in a diploid population. Data from C-banding and CMA/DAPI (Chromomycin A3/4,6-diamidino-2-phenylindole) fluorescent banding showed the diploid population has one CMA+/DAPI+ band, equivalent to the heterochromatic region of C-banding, while a triploid population has two CMA+/DAPI+ heterochromatic regions, suggesting an autopoliploid origin for the triploid cytotype. The autotriploid origin was also supported by the trivalent pairing of chromosomes and the presence of three sets of each chromosome in mitotic metaphase. Diploid and triploid cytotypes were easily maintained through vegetative propagation of this stoloniferous species.

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