scholarly journals Accelerated Mitochondrial Evolution and “Darwin's Corollary”: Asymmetric Viability of Reciprocal F1 Hybrids in Centrarchid Fishes

Genetics ◽  
2008 ◽  
Vol 178 (2) ◽  
pp. 1037-1048 ◽  
Author(s):  
Daniel I. Bolnick ◽  
Michael Turelli ◽  
Hernán López-Fernández ◽  
Peter C. Wainwright ◽  
Thomas J. Near
Keyword(s):  
F1 Hybrids ◽  
Mitochondrial Evolution ◽  
Centrarchid Fishes

FEATURES OF THE WINTER WHITE CABBAGE VARIETIES GENERATIVE DEVELOPMENT

1970 ◽  
pp. 38-40
Author(s):  
R. E. Kazakhmedov ◽  
М. А Magomedova
Keyword(s):  
Hormonal Regulation ◽  
F1 Hybrids ◽  
Vegetable Crops ◽  
Stem Extension ◽  
Market Competitiveness ◽  
White Cabbage ◽  
Environmentally Safe ◽  
Selection Tasks ◽  
High Yielding Varieties ◽  
High Yields

One of the modern selection tasks in vegetable growing is quality products improving, obtaining high yields of environmentally safe wide assortment vegetables. To the new varieties of vegetable crops including winter white cabbage are specified new requirements such as market competitiveness, resistance to unfavorable environmental conditions, heat resistance of the varieties and F1 hybrids. The article is shown investigation results about studies of exogenous treatment by solutions on the base of physiologically active compounds of hormonal nature on the started process of stem extension stage activation and flowering of winter white cabbage plants. For the first time in the Dagestan conditions has been studied the possibility of hormonal regulation of the premature stem extension stage and flowering prevention of winter white cabbage after the initiation of natural induction. In our studies with an early planting there are not more than 20% of blooming plants, most varieties showed a high propensity to premature stem extension stage and flowering. The possibility of the hormonal exogenous regulation of the unfavorable winter white cabbage flowering has been revealed. The most pronounced effect on the transition to stem extension stage and flowering were provided by auxin nature preparations. In particular, treatment with NAS at a dose of 5 mg / l significantly reduced the number of blossom plants, krezatsin (50 mg / l) had a similar effect, but it was less pronounced. The use of cabbage in winter crops makes it possible to obtain two or three yields per year from the same area. Creation and introduction into production of promising and high-yielding varieties and hybrids will allow increasing production and reducing its cost.

EVALUATION OF HYBRID SPRING WHEAT POPULATIONS

2018 ◽  
pp. 37-39
Author(s):  
O. V. Gladysheva ◽  
Т. А. Barkovskaya
Keyword(s):  
Correlation Coefficient ◽  
Spring Wheat ◽  
Dominant Role ◽  
F1 Hybrids ◽  
Hybrid Population ◽  
Selection Of

This article presents the results of a study of hybrid spring wheat populations. Revealed different patterns of inheritance of important traits in F1 hybrids, which is caused by hereditary features of the original forms and circumstances. Analysis of hybrid populations showed that the dominant role in the formation of 1000 grains mass belongs to productivity and weight of grain with an ear, correlation coefficient r = 0.90 and amounted to r = 0.73, respectively. Found that the hybrid population in F4-5, created on the basis of grades Moscow 35, Esther, Agatha, Rome, Saratovskaya 29 (Russia), Ostinka (Ukraine) are a valuable material for selection of highly productive genotypes for future use breeding process. 

Heterosis in F1 Hybrids of Sorghum vulgare × S. sudanense and S. vulgare × S. arundinaceum 1

1958 ◽  
Vol 50 (11) ◽  
pp. 714-715 ◽  
Author(s):  
J. P. Craigmiles ◽  
H. B. Harris ◽  
J. P. Newton ◽  
J. W. Dobson
Keyword(s):  
F1 Hybrids ◽  
Sorghum Vulgare

Genetic Evaluation and Bi-plot Analysis in Okra Hybrids for Yield, Quality Components and YVMV Resistance

2018 ◽  
Vol 5 (04) ◽  
Author(s):  
SS SOLANKEY ◽  
ANIL K SINGH
Keyword(s):  
Genetic Divergence ◽  
Principal Component ◽  
F1 Hybrids ◽  
Genetic Advance ◽  
Economic Traits ◽  
Cross Combination ◽  
Plot Analysis ◽  
Eigen Value ◽  
Coefficient Of Variability ◽  
Yield Quality

Fifty one okra F1 hybrids (using 17 lines as female and 3 testers as male parent) were evaluated in RCBD design during two different consecutive seasons (summer and rainy). Phenotypic coefficient of variability (PCV) was higher than genotypic coefficient of variability (GCV) for all studied character exhibiting environmental effects on the expression of characters. Heritability (h2b) along with genetic advance per cent of mean was found highest for character YVMV (86.95% and 150.61%). All the 51 okra hybrids were grouped into 4 distinct clusters in which Cluster II was the largest cluster having 28 F1s (54.90% of total F1s) followed by Cluster I with 14 F1s (27.45% of total F1s). Out of the major 6 PCs, 4 principal components (PC1, PC2, PC3 and PC4) accounted with proportionate values of 22.61, 17.22, 11.87 and 10.63%, respectively and contributed 62.33 % of the cumulative variation having Eigen value more than one. Moreover, based on PCs and genetic divergence in Cluster I and Cluster IV for plant height, YVMV and number of fruit per plant is important to identify the best cross combination (Arka Abhay × Arka Anamika) in okra. Therefore, the best cross combinations for improvement in various economic traits can be recommended on the basis of genetic divergence and principal component analysis in okra.

scholarly journals Coupled complementation of immune response genes controlling responsiveness to the H-2.2 alloantigen.

1977 ◽  
Vol 146 (2) ◽  
pp. 571-578 ◽  
Author(s):  
M E Dorf ◽  
J H Stimpfling
Keyword(s):  
Immune Response ◽  
Immune Responses ◽  
Humoral Response ◽  
Mixed Lymphocyte Culture ◽  
Lymphocyte Culture ◽  
F1 Hybrids ◽  
Gene Control ◽  
Low Responder ◽  
Resistant Strains ◽  
High Level

The ability of various B10 congenic resistant strains to respond to the alloantigen H-2.2 was tested. High and low antibody-producing strains were distinguished by their anti-H-2.2 hemagglutinating respones. However, these strains do not differ in their ability to respond to these antigenic differences in the mixed lymphocyte culture. The humoral response to the H-2.2 alloantigen was shown to be controlled by two interacting genes localized within the H-2 complex. Thus, F1 hybrids prepared between parental low responder strains could yield high level immune responses. In addition, strains bearing recombinant H-2 haplotypes were used to map the two distinct genes controlling the immune response. The alleles at each locus were shown to be highly polymorphic as evidenced by the asymmetric complementation patterns observed. The restricted interactions of specific alleles was termed coupled complementation. The significance of the results in the terms of mechanisms of Ir gene control are discussed.

scholarly journals Sequencing an F1 hybrid of Silurus asotus and S. meridionalis enabled the assembly of high-quality parental genomes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Weitao Chen ◽  
Ming Zou ◽  
Yuefei Li ◽  
Shuli Zhu ◽  
Xinhui Li ◽  
...  
Keyword(s):  
De Novo ◽  
Parental Species ◽  
F1 Hybrids ◽  
Pelteobagrus Fulvidraco ◽  
F1 Hybrid ◽  
Short Reads ◽  
Final Assembly ◽  
Genome Complexity ◽  
Hybrid Genome ◽  
Silurus Asotus

AbstractGenome complexity such as heterozygosity may heavily influence its de novo assembly. Sequencing somatic cells of the F1 hybrids harboring two sets of genetic materials from both of the paternal and maternal species may avoid alleles discrimination during assembly. However, the feasibility of this strategy needs further assessments. We sequenced and assembled the genome of an F1 hybrid between Silurus asotus and S. meridionalis using the SequelII platform and Hi-C scaffolding technologies. More than 300 Gb raw data were generated, and the final assembly obtained 2344 scaffolds composed of 3017 contigs. The N50 length of scaffolds and contigs was 28.55 Mb and 7.49 Mb, respectively. Based on the mapping results of short reads generated for the paternal and maternal species, each of the 29 chromosomes originating from S. asotus and S. meridionalis was recognized. We recovered nearly 94% and 96% of the total length of S. asotus and S. meridionalis. BUSCO assessments and mapping analyses suggested that both genomes had high completeness and accuracy. Further analyses demonstrated the high collinearity between S. asotus, S. meridionalis, and the related Pelteobagrus fulvidraco. Comparison of the two genomes with that assembled only using the short reads from non-hybrid parental species detected a small portion of sequences that may be incorrectly assigned to the different species. We supposed that at least part of these situations may have resulted from mitotic recombination. The strategy of sequencing the F1 hybrid genome can recover the vast majority of the parental genomes and may improve the assembly of complex genomes.

scholarly journals Cultivating response: Peasant seed and plant–human collaboration in an agro-industrial heartland

2021 ◽  
pp. 251484862110224
Author(s):  
Leila Rezvani
Keyword(s):  
Plant Breeding ◽  
Environmental Changes ◽  
F1 Hybrids ◽  
Vegetable Production ◽  
Environment Interaction ◽  
Peasant Farmer ◽  
Genotype Environment Interaction ◽  
Seed Saving ◽  
Peasant Farmers ◽  
Ways Of Being

Using Donna Haraway’s notion of “response-ability”, or the cultivation of the capacity for response, this paper seeks to understand seed saving and plant breeding as politically and ethically charged modes of interspecies communication. In Brittany, France, a region known for its industrial-scale fresh vegetable production, peasant farmers and organic plant breeders question the modernist plant breeding and agro-industrial paradigm, cross-pollinating ideas to produce new understandings of genotype-environment interaction, biodiversity and heredity. Plant liveliness is understood as politically transformative, constitutive of an agriculture that supports peasant farmer and crop plant creativity and self-determination. In contrast to F1 hybrids, open-pollinated semences paysannes (peasant seed) retain the ability to respond to environmental changes, adapt and evolve over (human and plant) generations. Farmers must in turn engage specific modes of attention, interpreting plant expressions and shaping future generations through rouging and crossing, selecting and saving, watching and learning from their crops. Mutual response is the foundation of interdependence, in which nonconspecific partners adjust to one another’s ways of being and doing in order to labor together. In remaining response-able, farmers reckon with the liveliness and agential capacities of plants, qualities that work against their subsumption into factory-like methods of cultivation. These communicative practices hint at the radical potential for interspecies resistance to monoculture within plant breeding and cultivation, practices that are so often molded by the interests of agro-industrial capital.

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