Variation for 2n pollen production and male fertility in wildSolanum germplasm resistant toPhytophthora infestans (Mont.) de Bary (US-8)

2002 ◽  
Vol 79 (3) ◽  
pp. 219-229 ◽  
Author(s):  
David C. Zlesak ◽  
Christian A. Thill
Keyword(s):  
Male Fertility ◽  
Pollen Production ◽  
2N Pollen

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

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.

scholarly journals Effects of Colchicine on Populus canescens Ectexine Structure and 2n Pollen Production

2020 ◽  
Vol 11 ◽  
Author(s):  
Qing Zhou ◽  
Jian Wu ◽  
Yaru Sang ◽  
Zhengyang Zhao ◽  
Pingdong Zhang ◽  
...  
Keyword(s):  
Pollen Production ◽  
2N Pollen

Temperature and genotypic effects on the expression of pol cytoplasmic male sterility in summer rape

1991 ◽  
Vol 71 (3) ◽  
pp. 655-661 ◽  
Author(s):  
D. R. Burns ◽  
R. Scarth ◽  
P. B. E. McVetty
Keyword(s):  
High Temperature ◽  
Brassica Napus ◽  
Cytoplasmic Male Sterility ◽  
Male Sterility ◽  
Male Fertility ◽  
Inbred Lines ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Controlled Environment ◽  
Pollen Production

The effect of high temperature treatment on the expression of cytoplasmic male sterility (CMS) was studied using inbred lines of four summer rape (Brassica napus L.) cultivars. The nuclear genotypes of inbred lines from each of the cultivars Karat, Lergo, Marnoo and Regent were evaluated for their ability to maintain pollen sterility in the pol cytoplasm. Seven days' exposure to day/night temperatures of 30/24 °C in a controlled environment led to increased pollen production in all of the F1 populations (F1's) in the study. Maximum reversion to male fertility occurred 6–13 d after removal from the high temperature treatment. There was a significant linear relationship between daily mean temperatures in the field and mean male sterility index (MSI). In Lergo, Marnoo and Regent F1's, the effect of high temperatures on male sterility expression in terms of days to maximum pollen production in the field was accurately predicted by the values obtained in the controlled environment study. For the Karat F1's, the maximum response in the field occurred later than in the controlled environment. Variation in the stability of male sterility was evident in the F1's, indicating the presence of different maintainer genes among the inbred lines of each cultivar. The absence of environment-by-line interactions in the F1's of three cultivars indicated a high degree of stability for this trait. Selection for maintenance of high levels of male sterility may therefore be possible. Key words: Brassica napus, male fertility reversion

SELFING ABILITY AND MALE STERILITY IN SENECIO VERNALIS WALDST. ET KIT. (ASTERACEAE) FROM ISRAEL

1994 ◽  
Vol 42 (2) ◽  
pp. 89-103 ◽  
Author(s):  
H.P. Comes
Keyword(s):  
Male Sterility ◽  
Breeding System ◽  
Male Fertility ◽  
Dominant Gene ◽  
Pollen Grains ◽  
Preliminary Evidence ◽  
Pollen Production ◽  
Male Sterile ◽  
Ovule Number ◽  
Selfing Ability

Two major findings relating to the breeding system of Senecio vernalis from Israel are reported. First, isolation experiments failed to confirm the existence of a widespread, truly self-compatible and predominantly self-pollinating breeding system in Israeli populations of S. vernalis. However, a single S. vernalis plant derived from a natural stand at Jerusalem was found to be self- compatible and strongly self-pollinating. In its progeny, there were signs of inbreeding depression commonly associated with selfed offspring of outbreeding species. Selfing ability ratios in this progeny indicate a single dominant gene for selfing ability in S. vernalis. The implications of these observations for the origin of S. vulgaris are briefly discussed. Second, the occurrence of gynodioecy in S. vernalis populations from Israel is reported. Although male sterile plants are recognizable by the complete absence of pollen on their exposed stigmas, there probably exists a large amount of variation within and between plants for pollen production. Infertile pollen grains of male steriles differ in size, shape, and sculpturing from those of hermaphrodites. At the Mt. of Olives, in Jerusalem, the frequency of male steriles was found to be 9.1%. There is some preliminary evidence for differences in floret (= ovule) number between the two gender types. Although the inheritance of male sterility appears to be predominantly cytoplasmically controlled, additional mechanisms restoring male fertility have to be postulated to account for the data observed in one of the crosses. The male sterility system in S. vernalis should therefore be referred to as “nuclear-cytoplasmic.”

Discrepancy between spindle anomalies and 2N pollen production insolanum interspecific hybrids

1997 ◽  
Vol 74 (6) ◽  
pp. 399-403 ◽  
Author(s):  
Amalia Barone ◽  
Domenico Carputo ◽  
Giuliana La Rotonda ◽  
Luigi Frusciante
Keyword(s):  
Interspecific Hybrids ◽  
Pollen Production ◽  
2N Pollen

Use of Ipomoea trifida (HBK.) G. Don germ plasm for sweet potato improvement. 1. Development of synthetic hexaploids of I. trifida by ploidy-level manipulations

Genome ◽  
1991 ◽  
Vol 34 (2) ◽  
pp. 201-208 ◽  
Author(s):  
Masaru Iwanaga ◽  
Rosanna Freyre ◽  
Gisella Orjeda
Keyword(s):  
Sweet Potato ◽  
Ploidy Level ◽  
Ipomoea Batatas ◽  
Colchicine Treatment ◽  
Pollen Production ◽  
2N Pollen ◽  
Ipomoea Trifida ◽  
Pollen Sample ◽  
Colchicine Solution ◽  
Synthetic Hexaploids

Crosses were made between 21 tetraploid accessions and 41 diploid accessions of Ipomoea trifida, obtaining a total of 9185 triploid seeds from 215 different cross combinations. Doubling the somatic chromosome number of the triploids was attempted by colchicine treatment on young seedlings to obtain synthetic hexaploids. A total of 787 axillary buds of 316 triploid plants were treated with a 0.5% colchicine solution for 24 h, applied to cotton plugs surrounding the buds. The survival rate of the treated buds was, on average, 41%. The ploidy level in germ-layer L2 was determined in 258 clones by evaluating a pollen sample from each clone. Fifty-five clones were selected for high stainability and pollen size. The selected genotypes were meiotically analyzed. Twenty-two of them were identified as hexaploid and 33 as triploid with 2n pollen production. The present study is the first report on 2n pollen production in triploid plants of Ipomoea species. The use of these triploid clones with 2n pollen production and synthetic hexaploid clones for sweet-potato breeding is discussed.Key words: Ipomoea batatas, Ipomoea trifida, colchicine, triploids, 2n pollen.

Sign in / Sign up

Export Citation Format

Share Document