Calendrier des sporogénèses et gamétogénèses femelles chez le diploïde et le tétraploïde induit de Brachiaria ruziziensis (Graminée)

1982 ◽  
Vol 60 (10) ◽  
pp. 2032-2036 ◽  
Author(s):  
J. Gobbe ◽  
Béatrice Longly ◽  
B.-P. Louant
Keyword(s):  
Interspecific Hybridization ◽  
Tetraploid Form ◽  
Sexual Species ◽  
Brachiaria Ruziziensis

The processes leading to the formation of the gametes are described in two sexual forms of Brachiaria ruziziensis Germain et Evrard: the natural diploid and an induced autotetraploid. This description comes within the framework of an interspecific hybridization program in the genus Brachiaria aiming at the transfer of the genes responsible for apomixis from polyploid apomictic to diploid sexual species. A "reproductive calendar" is established where microsporogenesis and microgametogenesis are used as reference scales for the concomitant events of megasporogenesis and megagametogenesis of the two forms. This calendar will be compared with similar ones which have to be established for B. decumbens Stapf. and B. brizantha (Hochst) Stapf., natural tetraploid apomicts. Differences were noticed between the original diploid and the induced tetraploid form.

Natural interspecific hybridization between sexual and apogamous species of the beech fern genus Phegopteris Fée

1972 ◽  
Vol 50 (6) ◽  
pp. 1295-1300 ◽  
Author(s):  
Gerald A. Mulligan ◽  
Lionel Cinq-Mars ◽  
William J. Cody
Keyword(s):  
North America ◽  
Interspecific Hybridization ◽  
Interspecific Hybrid ◽  
Genetic Material ◽  
Female Gamete ◽  
Eastern North America ◽  
Natural Hybrid ◽  
Sexual Species

A clone of beech fern found growing on a mountain near Rougemont in Rouville County of Quebec is shown to be a natural hybrid between two species of Phegopteris that grow together at that location, the circumboreal species P. polypodioides Fée and a species endemic to eastern North America, P. hexagonoptera (Michx.) Fée. Phegopteris polypodioides is shown to be an apogamous triploid (2n = 90), P. hexagonoptera a sexual diploid (2n = 60), and the interspecific hybrid between these two species an apogamous tetraploid (2n = 120). It was concluded that the natural hybrid was produced by the union of a motile gamete, containing 90 chromosomes, from an antheridium on a prothallus of apogamous P. polypodioides with a female gamete, containing 30 chromosomes, on a prothallus of sexual P. hexagonoptera. This is the second report of interspecific hybridization between sexual and apogamous species of ferns. The morphology of both parents and the hybrid supports the conclusion that the apogamous species contributed more genetic material to the hybrid than did the sexual species. It is suggested that this hybrid probably occurs at other locations where the ranges of P. polypodioides and P. hexagonoptera overlap.

Interspecific Hybridization between Banksia hookeriana Meisn. and Banksia prionotes Lindl. (Proteaceae)

1996 ◽  
Vol 157 (5) ◽  
pp. 638-643 ◽  
Author(s):  
M. Sedgley ◽  
M. G. Wirthensohn ◽  
K. L. Delaporte
Keyword(s):  
Interspecific Hybridization

Pentaploid Apomicts by Interspecific Hybridization between Diploid Urochloa ruziziensis and Tetraploid Apomictic U. decumbens

Crop Science ◽  
2019 ◽  
Vol 59 (4) ◽  
pp. 1648-1656
Author(s):  
Pattama Nitthaisong ◽  
Genki Ishigaki ◽  
Kazuhino Suenaga ◽  
Melody Muguerza ◽  
Hidenori Tanaka ◽  
...  
Keyword(s):  
Interspecific Hybridization

scholarly journals Mitochondrial DNA duplication, recombination, and introgression during interspecific hybridization

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Silvia Bágeľová Poláková ◽  
Žaneta Lichtner ◽  
Tomáš Szemes ◽  
Martina Smolejová ◽  
Pavol Sulo
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Mitochondrial Dna ◽  
Interspecific Hybridization ◽  
Mobile Elements ◽  
Variable Length ◽  
Mitochondrial Genomes ◽  
Free Standing ◽  
Saccharomyces Paradoxus ◽  
Mtdna Recombination

AbstractmtDNA recombination events in yeasts are known, but altered mitochondrial genomes were not completed. Therefore, we analyzed recombined mtDNAs in six Saccharomyces cerevisiae × Saccharomyces paradoxus hybrids in detail. Assembled molecules contain mostly segments with variable length introgressed to other mtDNA. All recombination sites are in the vicinity of the mobile elements, introns in cox1, cob genes and free standing ORF1, ORF4. The transplaced regions involve co-converted proximal exon regions. Thus, these selfish elements are beneficial to the host if the mother molecule is challenged with another molecule for transmission to the progeny. They trigger mtDNA recombination ensuring the transfer of adjacent regions, into the progeny of recombinant molecules. The recombination of the large segments may result in mitotically stable duplication of several genes.

Cytogenetic analysis of interspecific hybridization in oil-tea (Camellia oleifera)

Euphytica ◽  
2021 ◽  
Vol 217 (2) ◽  
Author(s):  
Yanmin Li ◽  
Tianwen Ye ◽  
Chunxia Han ◽  
Zhihua Ye ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Interspecific Hybridization ◽  
Cytogenetic Analysis ◽  
Camellia Oleifera
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