Results 151 to 160 of about 1,836 (191)
Some of the next articles are maybe not open access.
Mechanisms of unreduced gamete formation in flowering plants
Russian Journal of Genetics, 2017Unreduced gametes play a fundamental role in speciation of flowering plants, asexual reproduction of plants, and restoration of fertility of distant hybrids used to produce new varieties with breeding-valuable traits. Unreduced gametes are formed as a result of meiotic restitution.
D. B. Loginova, O. G. Silkova
openaire +1 more source
How cytomixis can form unreduced gametes in tobacco
Plant Systematics and Evolution, 2014Cytomixis is migration of the nuclei between cells, widespread in various higher plant species. Most frequently, cytomixis takes place in microsporogenesis and is assumed to be a possible cause of unreduced gamete generation. In the present work the cytological mechanisms leading to a change in the cell chromosome number via cytomixis in tobacco ...
Sergey R. Mursalimov, Elena V. Deineko
openaire +1 more source
Unreduced gametes in diploid Medicago and their importance in alfalfa breeding
Theoretical and Applied Genetics, 1986In the genus Medicago, it is known that 2n gametes have been important in the evolution and breeding of cultivated alfalfa, which is a natural polysomic polyploid (2n=4x=32), however little is known on the frequency of male and female 2n gametes in diploid relatives of alfalfa.
VERONESI, Fabio +2 more
openaire +3 more sources
Production and viability of unreduced gametes in triploid interspecific blueberry hybrids
Theoretical and Applied Genetics, 1988Three triploid (2n=3x=36) blueberry hybrids were obtained by hand-pollinating approximately 7,000 flowers of tetraploid highbush blueberry cultivars (based on Vaccinium corymbosum L.) with pollen from the diploid species V. elliottii Chapm. Meiotic analysis of these triploids revealed trivalents, bivalents and univalents in all metaphase I cells, with ...
I M, Dweikat, P M, Lyrene
openaire +2 more sources
Numerically unreduced (2n) gametes and sexual polyploidization in Actinidia
Euphytica, 1997This is the first report on the production of numerically unreduced (2n) gametes in Actinidia species. Their occurrence was apparent from direct observations of microporogenesis in 2x, 3x, 4x and 6x plants and was inferred from ploidy analysis of progenies from 4x-2x and 2x-4x crosses. Both male and female plants were found to produce 2n gametes.
Guijun Yan +3 more
openaire +1 more source
Evidence of functional unreduced gametes in Trifolium repens L.
Euphytica, 1997The current research reports the first evidence of functional 2n gametes in megaspores of Trifolium repens L. Reciprocal backcrossing of a colchicine doubled hexaploid (2n = 6x = 48) T. repens × T. nigrescens (6x H-6909-5) F1 hybrid to T. repens produced four seeds from 1700 pollinations.
S.W. Hussain, W.M. Williams
openaire +1 more source
A new method for producing allohexaploid Brassica through unreduced gametes
Euphytica, 2011We trialled a two-step method of producing allohexaploid Brassica with three genomes (A, B, and C) derived from pair-wise crossing among three allotetraploid Brassica species. In the first step, the three allotetraploid Brassica species (Brassica juncea, AjAjBjBj; Brassica napus, AnAnCnCn; and Brassica carinata, BcBcCcCc) were intercrossed in pairs to ...
Mason, Annaliese S. +3 more
openaire +2 more sources
Reduced and unreduced gametes combine almost freely in a multiploidy system
Perspectives in Plant Ecology, Evolution and Systematics, 2016Abstract One of the key modes of plant speciation is polyploidy (duplication of all chromosomes), which can lead to sympatric speciation because it is often associated with limited gene flow and reproductive isolation. To understand the dynamics of sympatric mixed-ploidy systems, we examined the processes operating in them using a general gametic ...
Tomáš Herben +2 more
openaire +1 more source
Frequent occurrence of unreduced gametes in Triticum turgidum–Aegilops tauschii hybrids
Euphytica, 2009Spontaneous chromosome doubling via union of unreduced (2n) gametes has been thought to be the way that common wheat (Triticum aestivum L.) was originated from the hybridization of T. turgidum L. with Ae. tauschii Cosson. Previous works have observed unreduced gametes in F1 hybrids of Ae. tauschii with six of the eight T. turgidum subspecies. It is not
Lian-Quan Zhang +8 more
openaire +1 more source
Inheritance in doubled-diploid clementine and comparative study with SDR unreduced gametes of diploid clementine [PDF]
Plant Cell Reports, 2016 Tetraploid clementine displays mainly tetrasomic inheritance. Genetic structures of 2n SDR and 2 × gametes from DD clementine are complementary and will guides triploids citrus breeding strategies. Triploid breeding is developed worldwide to create new seedless cultivars.
Aleza, Pablo +4 more
openaire +3 more sources