Simultaneous production of triploid and haploid eggs by triploid Squalius alburnoides (Teleostei: Cyprinidae)

Journal of Experimental Zoology. Part A, Comparative Experimental Biology
M Judite AlvesMaria Manuela Coelho

Abstract

The hybrid minnow Squalius alburnoides comprises diploid and polyploid forms with altered modes of reproduction. In the present paper, we report a cross where a triploid female generated both large, triploid and small, haploid eggs simultaneously, which were fertilized with S. pyrenaicus sperm. Although the large eggs were rarer (15%), they originated offspring with higher survivorship, so that tetraploids were dominant among the surviving siblings. The cross yielded apparently all female progeny. Inheritance patterns were inferred using four microsatellite markers and NORs (Nucleolus Organizer Regions) phenotypes, and suggested that haploid eggs were probably produced by an atypical hybridogenesis, in which the elimination of the unmatched genome permitted random segregation and recombination between the homospecific genomes, while the triploid eggs were clonal. The present results suggest that the occurrence of triploid unreduced eggs may be a new route for the natural tetraploidization in the complex.

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Citations

Apr 22, 2006·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·Marta GromichoMaria João Collares-Pereira
Jun 5, 2008·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Carina CunhaMaria M Coelho
Apr 24, 2012·Evolution; International Journal of Organic Evolution·Noah D Charney
Jun 7, 2014·Journal of Fish Biology·M R Kimura-KawaguchiH Munehara
Sep 23, 2006·Zoology : Analysis of Complex Systems, ZACS·María E Crespo-LópezMaria M Coelho
Mar 14, 2007·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·Carla Sousa-SantosVitor Almada
Jun 3, 2017·Royal Society Open Science·Miguel Morgado-SantosMaria João Collares-Pereira
Jun 30, 2007·Molecular Phylogenetics and Evolution·C Sousa-SantosV Almada

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