scholarly journals Cell fusion as the formation mechanism of unreduced gametes in the gynogenetic diploid hybrid fish

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Jing Wang ◽  
Qingfeng Liu ◽  
Kaikun Luo ◽  
Xuan Chen ◽  
Jun Xiao ◽  
...  
Keyword(s):  
Cell Fusion ◽  
Formation Mechanism ◽  
Unreduced Gametes ◽  
Diploid Hybrid ◽  
Gynogenetic Diploid ◽  
Hybrid Fish

Gynogenetic diploids, tetraploids, or octoploids, and a path to polyploidy in Anuran Amphibians

Genome ◽  
2021 ◽  
Author(s):  
James P. Bogart
Keyword(s):  
Unreduced Gametes ◽  
Hyla Chrysoscelis ◽  
Polyploid Species ◽  
Chromosome Counts ◽  
Diploid Males ◽  
Ploidy Levels ◽  
Anuran Amphibians ◽  
Tadpole Tail ◽  
Gynogenetic Diploid ◽  
Tail Tip

Unreduced gametes have been implicated in the evolution of polyploid species of plants and animals and are normally produced by female anuran amphibians. Such eggs may initiate the evolution of polyploid species that have independently arisen in several anuran families. Polyploid females could also produce unreduced eggs that might lead to species with higher ploidy levels or their eggs may develop gynogenetically to reduce the ploidy level. Diploid Hyla chrysoscelis (2n=24) and tetraploid H. versicolor (4n=48) are sibling cryptic species of North American Grey Treefrogs. Artificial crosses using H. versicolor females and genetically distant diploid males were performed to produce haploid H. versicolor and to assess the production of unreduced eggs in this tetraploid species. Gynogenetic diploid (haploid H. versicolor), allotriploid, gynogenetic tetraploid, allopentaploid, autohexaploid, and gynogenetic octoploid tadpoles were confirmed using chromosome counts from tadpole tail tip squashes. Transformation and survival of the different ploidies varied. Gynogenetic diploids transformed but expressed aspects of the haploid syndrome and died before or shortly after transformation.

scholarly journals Diploid hybrid fish derived from the cross between female Bleeker’s yellow tail and male topmouth culter, two cyprinid fishes belonging to different subfamilies

BMC Genetics ◽  
2019 ◽  
Vol 20 (1) ◽  
Author(s):  
Shengnan Li ◽  
Lihua Xie ◽  
Jun Xiao ◽  
Liujiao Yuan ◽  
Tian Zhou ◽  
...  
Keyword(s):  
5S Rdna ◽  
Reproductive Traits ◽  
Gonadal Development ◽  
Diploid Hybrid ◽  
Distant Hybridization ◽  
High Quality ◽  
Genetic Breeding ◽  
Fertile Female ◽  
Hybrid Fish ◽  
Fish Genetic Breeding

Abstract Background Bleeker’s yellow tail (Xenocypris davidi Bleeker, YT) and topmouth culter (Culter alburnus Basilewsky, TC) are both famous and important economic freshwater fish in China. YT, a kind of omnivorous fish, has strong resistance. TC, a kind of carnivorous fish, has high-quality meat but poor resistance. Distant hybridization can integrate the advantages of both parents. There has been no previous report regarding hybrid fish derived from female YT × male TC. It is expected that hybridization of these two kinds of fish will result in F1 hybrids with improved characteristics, such as faster growth rate, stronger resistance, and high-quality meat, which are of great significance in fish genetic breeding. Results In this study, we investigated the main biological characteristics of diploid hybrid fish derived from female YT × male TC. The hybrids had an intermediate number of upper lateral line scales between those for YT and TC. The hybrids were diploids with 48 chromosomes and had the same karyotype formula as their parents. The hybrids generated variations in 5S rDNA (designated class IV: 212 bp) and lost specific 5S rDNA derived from the maternal parent (designated class II: 221 bp), which might be related to hybridization. In terms of reproductive traits, all the tested female hybrids exhibited normal gonadal development, and the two-year-old F1 females produced mature eggs. However, all the tested testes of the male hybrids could not produce mature sperm. It is possible that the hybrid lineage will be established by back-crossing the fertile female hybrids and their parents. Conclusions Obtaining a fertile female hybrid fish made the creation of a new type of fish possible, which was significant in fish genetic breeding.

Antibacterial and immunoregulatory activity of a novel hepcidin homologue in diploid hybrid fish (Carassius auratus cuvieri ♀ × Carassius auratus red var ♂)

2020 ◽  
Vol 98 ◽  
pp. 551-563 ◽  
Author(s):  
Sheng-Wei Luo ◽  
Zi-Ye Luo ◽  
Teng Yan ◽  
Kai-Kun Luo ◽  
Ping-Hui Feng ◽  
...  
Keyword(s):  
Carassius Auratus ◽  
Diploid Hybrid ◽  
Hybrid Fish

scholarly journals Identification of the High Frequency of Triploid Potato Resulting from Tetraploid × Diploid Crosses

HortScience ◽  
2019 ◽  
Vol 54 (7) ◽  
pp. 1159-1163
Author(s):  
Ryan C. Graebner ◽  
Hsuan Chen ◽  
Ryan N. Contreras ◽  
Kathleen G. Haynes ◽  
Vidyasagar Sathuvalli
Keyword(s):  
High Frequency ◽  
Potato Breeding ◽  
Unreduced Gametes ◽  
Hybrid Population ◽  
Development Programs ◽  
Diploid Hybrid ◽  
Diploid Parent ◽  
Genomic Studies ◽  
Triploid Block ◽  
Triploid Clones

Conventional wisdom regarding potato breeding indicates that a strong triploid block prevents the development of viable triploid seeds from crosses between tetraploid and diploid clones. However, in a recent set of crosses between elite tetraploid potatoes and an improved diploid hybrid population derived from group Stenotomum and group Phureja, 61.5% of the resulting clones were found to be triploid. If clones derived from one diploid parent suspected of producing a high frequency of unreduced gametes were excluded, then the frequency of triploid clones increased to 74.4%. Tubers of these triploids are generally intermediates of the two parental groups. Our findings indicate the possibility of using triploid potatoes in potato variety development programs and in genetic and genomic studies.

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