Male fertility and 2n pollen production in haploid-wild species hybrids

1985 ◽  
Vol 62 (9) ◽  
pp. 479-487 ◽  
Author(s):  
Shelley A. Hermundstad ◽  
S. J. Peloquin
Keyword(s):  
Wild Species ◽  
Male Fertility ◽  
Pollen Production ◽  
2N Pollen ◽  
Species Hybrids

2n pollen in eleven 2x, 2EBN wild species and their haploid x wild species hybrids

1988 ◽  
Vol 31 (4) ◽  
pp. 581-589 ◽  
Author(s):  
G. L. Yerk ◽  
S. J. Peloquin
Keyword(s):  
Wild Species ◽  
2N Pollen ◽  
Species Hybrids

Meiotic restitution mechanisms and 2n pollen formation in a Solanum tuberosum dihaploid and in dihaploid x wild species hybrids*

1996 ◽  
Vol 115 (3) ◽  
pp. 157-161 ◽  
Author(s):  
C. Conicella ◽  
G. Genualdo ◽  
A. Errico ◽  
L. Frusciante ◽  
L. M. Monti
Keyword(s):  
Solanum Tuberosum ◽  
Wild Species ◽  
2N Pollen ◽  
Meiotic Restitution ◽  
Pollen Formation ◽  
Species Hybrids

Cytology and leafspot resistance in Arachis hypogaea x wild species hybrids

Euphytica ◽  
1982 ◽  
Vol 31 (3) ◽  
pp. 885-893 ◽  
Author(s):  
M. Company ◽  
H. T. Stalker ◽  
J. C. Wynne
Keyword(s):  
Arachis Hypogaea ◽  
Wild Species ◽  
Species Hybrids

A genetic model for tuberization in potato haploid-wild species hybrids grown under long-day conditions

2004 ◽  
Vol 81 (5) ◽  
pp. 335-339 ◽  
Author(s):  
Shelley H. Jansky ◽  
Georgia L. Davis ◽  
Stanley J. Peloquin
Keyword(s):  
Wild Species ◽  
Genetic Model ◽  
Long Day ◽  
Species Hybrids

Variability of flowering and 2n pollen production in diploid potatoes under high temperatures

1987 ◽  
Vol 64 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Kathleen G. Haynes ◽  
F. L. Haynes ◽  
William H. Swallow
Keyword(s):  
High Temperatures ◽  
Pollen Production ◽  
2N Pollen

Use of Ipomoea trifida (HBK.) G. Don germ plasm for sweet-potato improvement. 2. Fertility of synthetic hexaploids and triploids with 2n gametes of I. trifida, and their interspecific crossability with sweet potato

Genome ◽  
1991 ◽  
Vol 34 (2) ◽  
pp. 209-214 ◽  
Author(s):  
Rosanna Freyre ◽  
Masaru Iwanaga ◽  
Gisella Orjeda
Keyword(s):  
Sweet Potato ◽  
Egg Production ◽  
Ipomoea Batatas ◽  
2N Gametes ◽  
Pollen Production ◽  
2N Pollen ◽  
Ipomoea Trifida ◽  
Potato Improvement ◽  
Synthetic Hexaploids ◽  
Interspecific Crossability

Twenty-two synthetic hexaploids and 33 triploids with 2n pollen production of Ipomoea trifida were used in crosses to estimate their male and female fertility and their crossability with sweet potato, Ipomoea batatas (L.) Lam. Several important conclusions were drawn. (i) The fertility of pollen of the triploid plants was confirmed, which suggested they are truly functional 2n pollen. (ii) The average male fertility of hexaploid plants was higher than that of triploid with 2n pollen production plants. (iii) 2n egg production was observed in several triploid genotypes, (iv) From a polycross, 3079 seeds with normal shapes were produced. These represent a population of hexaploid I. trifida with a wide genetic base, and they may be important material for sweet-potato improvement, (v) A total of 3275 seeds were obtained from crosses with six sweet-potato female parents, of which only 60 germinated, indicating the existence of an interspecific barrier. The implications of 2n gametes for breeding and evolution of sweet potato are also discussed.Key words: Ipomoea batatas, Ipomoea trifida, 2n gametes, sexual polyploidization, triploid.

scholarly journals Fertile Intersectional F1 Hybrids of 4x Vaccinium meridionale (Section Pyxothamnus) and Highbush Blueberry, V. corymbosum (Section Cyanococcus)

HortScience ◽  
2021 ◽  
pp. 1-6
Author(s):  
Mark K. Ehlenfeldt ◽  
James L. Luteyn
Keyword(s):  
South America ◽  
Male Fertility ◽  
First Generation ◽  
Seedling Stage ◽  
F1 Hybrids ◽  
Highbush Blueberry ◽  
Pollen Production ◽  
Tetraploid Species ◽  
Plant Structure ◽  
Potential Value

Vaccinium meridionale (section Pyxothamnus), a tetraploid species native to higher altitude locations in Jamaica, Colombia, and Venezuela, is of considerable interest to blueberry breeders for its profuse, concentrated flowering and monopodial plant structure, both of which may be useful in breeding for mechanical harvest. In this study, tetraploid V. meridionale was successfully hybridized as a male with 4x V. corymbosum (section Cyanococcus, highbush blueberry). The first-generation hybrids with highbush blueberry selections were intermediate in morphology and notably vigorous. The 4x F1 hybrids displayed variable branching structure, dormancy, prolificacy, fruit wax, etc.; however, most appear to be deciduous to semi-evergreen, with small, dark-colored fruit. The F1 hybrids displayed good fertility as females in backcrosses to 4x highbush and these crosses have produced numerous offspring morphologically indistinguishable from 4x highbush at the seedling stage. Evaluations of male fertility found variation for pollen production and quality but, significantly, found some clones with very good shed, high stainability, and almost complete tetrad production. The fertility suggests that these hybrids, despite being derived from intersectional crosses, might be conventionally used without significant difficulty. These hybrids also have potential value for the nascent V. meridionale breeding efforts occurring in Colombia, South America.

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