Results 161 to 170 of about 1,836 (191)
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Plant Reproduction, 2015
Meiosis and unreduced gametes. Sexual flowering plants produce meiotically derived cells that give rise to the male and female haploid gametophytic phase. In the ovule, usually a single precursor (the megaspore mother cell) undergoes meiosis to form four haploid megaspores; however, numerous mutants result in the formation of unreduced gametes ...
Arnaud, Ronceret +1 more
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Meiosis and unreduced gametes. Sexual flowering plants produce meiotically derived cells that give rise to the male and female haploid gametophytic phase. In the ovule, usually a single precursor (the megaspore mother cell) undergoes meiosis to form four haploid megaspores; however, numerous mutants result in the formation of unreduced gametes ...
Arnaud, Ronceret +1 more
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Unreduced gamete formation in Curculigo capitulata (Amaryllidaceae)
Curuculigo capitulata is a perennial species from tropical Asia. The rhizomes have medicinal value and several chemical compounds were isolated from rhizomes. Only a few cytogenetic studies have been developed on this species. The presente study reports the formation of reduced gametes in plants of two Brasilian populations and confirms the chromosome ...Neide da Silva +6 more
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Evidence for the production of unreduced gametes by tetraploid Rosa hybrida L.
Euphytica, 2003Dihaploid roses, parthenogenetically derived from Rosa hybrida L. tetraploid cultivars, were recently shown to produce unreduced male and female gametes. On the occasion of an attempt to obtain new dihaploids, the gametic behaviour of some tetraploid R.
L. Crespel, S. Gudin
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Unreduced gamete in interspecific hybrids in the Festuca/Lolium complex
Plant Breeding, 1995AbstractSelf‐sterile interspecific hybrids between diploid Lolium perenne and either Festuca arundinacea or F. gigantea (both hexaploids) set some seeds when subjected to a heavy pollen cloud from the amphiploids derived from the hybrids. All the progeny were octoploid and were formed from the fertilization of unreduced gametes in the F1 hybrid by ...
W. G. Morgan +2 more
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American Journal of Botany
AbstractPremiseUnreduced gametes are the primary mechanism of neopolyploid formation. Their production in diploid populations is arguably maladaptive, but the magnitude and patterns of genetically based variation maintained in natural populations are poorly understood.MethodsWe examined variation in male and female unreduced gamete production among ...
Sarah DeVries +2 more
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AbstractPremiseUnreduced gametes are the primary mechanism of neopolyploid formation. Their production in diploid populations is arguably maladaptive, but the magnitude and patterns of genetically based variation maintained in natural populations are poorly understood.MethodsWe examined variation in male and female unreduced gamete production among ...
Sarah DeVries +2 more
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Journal of Genetics, 2016
Allohexaploid wheat was derived from interspecific hybridization, followed by spontaneous chromosome doubling. Newly synthesized hexaploid wheat by crossing Triticum turgidum and Aegilops tauschii provides a classical model to understand the mechanisms of allohexaploidization in wheat.
HAO LI +5 more
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Allohexaploid wheat was derived from interspecific hybridization, followed by spontaneous chromosome doubling. Newly synthesized hexaploid wheat by crossing Triticum turgidum and Aegilops tauschii provides a classical model to understand the mechanisms of allohexaploidization in wheat.
HAO LI +5 more
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Genetics and cytology of unreduced gametes in cultivated rye (Secale cereale L.)
Genome, 1987An inbred genotype of cultivated rye was found that produces unreduced gametes in a very regular fashion. In the cross progeny of this line with another inbred line, which did not show unreduced gametes, the inheritance of this phenomenon was studied.
T. Lelley, A. A. Mahmoud, V. Lein
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Euphytica, 2003
The F1 hybrids of seven diploid Alstroemeria species (2n=2x=16) were investigated for the production of numerically unreduced (2n) gametes and their mode of origin. Based on a survey of 17 interspecific hybrid combinations,consisting of 119 genotypes, it was found that the F1 hybrids of Chilean-Brazilian species mostly produced first division ...
Ramanna, M.S., Kuipers, G., Jacobsen, E.
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The F1 hybrids of seven diploid Alstroemeria species (2n=2x=16) were investigated for the production of numerically unreduced (2n) gametes and their mode of origin. Based on a survey of 17 interspecific hybrid combinations,consisting of 119 genotypes, it was found that the F1 hybrids of Chilean-Brazilian species mostly produced first division ...
Ramanna, M.S., Kuipers, G., Jacobsen, E.
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Biology of reproduction, 2012
Most individuals of the loach Misgurnus anguillicaudatus reproduce bisexually, but cryptic clonal lineages reproduce by natural gynogenesis of unreduced diploid eggs that are genetically identical to maternal somatic cells. Triploid progeny often occur by the accidental incorporation of a sperm nucleus into diploid eggs.
Kagayaki, Morishima +2 more
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Most individuals of the loach Misgurnus anguillicaudatus reproduce bisexually, but cryptic clonal lineages reproduce by natural gynogenesis of unreduced diploid eggs that are genetically identical to maternal somatic cells. Triploid progeny often occur by the accidental incorporation of a sperm nucleus into diploid eggs.
Kagayaki, Morishima +2 more
openaire +1 more source