Results 171 to 180 of about 144,774 (218)

Heterozygosity in 2n gametes of potato evaluated by RFLP markers

Theoretical and Applied Genetics, 1995
The heterozygosity transmitted through 2n gametes in potato was evaluated by following the segregation of RFLP markers in tetraploid progeny from bilateral sexual polyploidization in a cross between two diploid (2x) interspecific hybrids which produce 2n SDR eggs or 2n FDR pollen.
Amalia Barone, Christiane Gebhardt, L. Frusciante   +2 more
semanticscholar   +4 more sources

2n gametes in potato species and their function in sexual polyploidization

Euphytica, 1977
The extent and pattern of polyploidy in the tuber-bearing Solanums varies among the many taxanomic series that have been identified in this subsection of Solanum. While several series appear to be entirely diploid, others exhibit a range of ploidy levels from 2x to 6x, and some contain only polyploid species.
T. D. Nijs, S. Peloquin
semanticscholar   +2 more sources

2n gametes inSolanum tuberosum dihaploids

American Journal of Potato Research, 1999
Pollen stainability over two years and microsporogenesis were investigated in seven dihaploids extracted fromSolanum tuberosum tetraploids (AVRDC-1287.19, Conchita, Merrimack and W231). Two dihaploids proved to be male-sterile and male gamete abortion is likely to be post-meiotic because a regular meiosis occurred.
Alfano F, Cammareri M, Errico A, Frusciante L, Conicella C   +4 more
openaire   +3 more sources

Numerically unreduced (2n) gametes and sexual polyploidization in Actinidia

Euphytica, 1997
This 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.
G. Yan, A. Ferguson, M. McNeilage, B. Murray   +3 more
semanticscholar   +2 more sources

Origin and evolution of cultivated tetraploid potatoes via 2n gametes

Theoretical and Applied Genetics, 1982
A high gene frequency for ps (parallel spindles) is expected in cultivated tetraploid potatoes, S. tuberosum Group Tuberosum, if 2n pollen produced by ancestral diploid plants which were psps was involved in the origin and evolution of the potato. Fifty-six North American cultivars (varieties and advanced selections) were pollinated by diploid clones ...
M, Iwanaga, S J, Peloquin
openaire   +2 more sources

Formation of 2n gametes in durum wheat haploids: Sexual polyploidization

Euphytica, 2003
Allopolyploidy, resulting from interspecific and intergeneric hybridization accompanied by sexual doubling of chromosomes, has played a major role in the evolution of crop plants that sustain humankind. The allopolyploid species, including durum wheat, bread wheat, and oat, have developed a genetic control of chromosome pairing that confers on them ...
P. Jauhar
semanticscholar   +2 more sources

2n gametes in the potato: essential ingredients for breeding and germplasm transfer

Theoretical and Applied Genetics, 2000
2n gametes are the result of meiotic mutations occurring during micro – and mega-sporogenesis. They have been identified in several plant species of different taxa. The potato is probably the crop plant where they have been most intensively studied and also more appropriately used for the genetic improvement of cultivated genotypes.
D. Carputo, A. Barone, L. Frusciante
semanticscholar   +4 more sources

USE OF 2n GAMETES FOR INDUCING INTERGENOMIC RECOMBINATION IN LILY HYBRIDS

Acta Horticulturae, 2005
Genetic recombination is an important pre-requisite for transferring specific genetic traits across distantly related plant species. With a view to transfer some of the desirable characters like resistances against viruses, Fusarium and Botrytis, besides many horticultural traits, we have made interspecific hybrids between different species of lilies ...
Barba Gonzalez, R., Lim, K.B., Ramanna, M.S., van Tuyl, J.M.   +3 more
openaire   +1 more source

Diploid Ancestors of Triploid Export Banana Cultivars: Molecular Identification of 2n Restitution Gamete Donors and n Gamete Donors

Molecular Breeding, 2005
The origin of triploid export banana cultivars was investigated. They all belong to Cavendish and Gros Michel subgroups of triploid clones and have a monospecific Musa acuminata origin. The appearance of these cultivars is thought to be result of hybridization between partially sterile diploid cultivars producing non reduced gametes and fertile ...
Rabouin, Louis-Marie, Carreel, Françoise, Noyer, Jean-Louis, Baurens, Franc-Christophe, Horry, Jean-Pierre, Bakry, Frédéric, Tezenas Du Montcel, Hugues, Ganry, Jacky, Lanaud, Claire, Lagoda, Pierre J.L.   +9 more
openaire   +3 more sources

INDUCTION OF 2N GAMETES FOR OVERCOMING F1-STERILITY IN LILY AND TULIP

Acta Horticulturae, 2006
For overcoming F1-sterility in interspecific hybrids, mitotic and meiotic polyploidisation is applied in lily and can result in fertile allopolyploids. The mechanism of viable pollen production of mitotic and meiotic polyploidisation is quite different.
Barba Gonzalez, R., Miller, C.T., Ramanna, M.S., van Tuyl, J.M.   +3 more
openaire   +2 more sources