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Showing 1 to 20 of 65 for “"Backcross"”.
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Analysis of Certain Backcross Populations Derived From Zea Mays (L.) X Zea Mexicana (Schrad., m.r.) Hybrids
Made available in DSpace on 2014-12-10T17:12:19Z (GMT). No. of bitstreams: 1 6408404.pdf: 2261504 bytes, checksum: e19fd252b6fdc00d0a9a1659a2baf6bb (MD5) Previous issue date: 1964
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Cytomorphological Studies of Hybrids Between Maize and Tetraploid Tripsacum Dactyloides (L.) L. And Their Backcross Derivatives
Made available in DSpace on 2014-12-10T17:12:49Z (GMT). No. of bitstreams: 1 7021023.pdf: 2691565 bytes, checksum: c1ab8f3f00284c1632e5425e3f5a3943 (MD5) Previous issue date: 1970
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Evaluating the Adaptive Genomic Landscape of Remnant and Backcross American Chestnut Populations to Inform Germplasm Conservation
… regarding the population genomics of wild and backcross American chestnut populations. I 1) estimated the genomic diversity, population structure, and demographic history of remnant wild American chestnut populations; 2) revealed the genomic basis of local climate adaptation in American …
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Bulk segregant analysis for anther culture response and leptine content in backcross families of diploid potato
… of microsatellite markers and three traits in backcrosses. Two of the traits, anther culture competence and 2<I>n</I> pollen production, originated from <I>S. phureja</I> whereas the third, leptine production (a specific glycoalkaloid known to convey resistance to the Colorado potato beetle) …
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Assessing wild barley germplasm in multiparent and advanced backcross populations for mapping, gene discovery, and improvement of malting barley
… cultivated barley backgrounds using advanced backcross (AB) and nested association mapping (NAM) techniques. To do this, we created a wild barley AB-NAM population by backcrossing 25 wild barley accessions to the 6-rowed malting barley cultivar Rasmusson. The 25 wild barley parents were …
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Small stem assay for chestnut blight resistance in segregating half-sib and full-sib families of F2 and backcross hybrid chestnut trees
… as a small stem assay. We screened 110 first-backcross seedlings and 98 third-backcross seedlings in a completely randomized design in 2017 (Gentner 2018). In 2018, an additional 391 F2 hybrid chestnut seedlings were screened in a randomized complete block design. All seedlings were inoculated …
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Chlorophyll Retention in Near-Isogenic Lines of Soybeans
Backcross-derived near-isogenic lines of soybeans (Glycine max L. Merrill) having nuclear genes (genetic greens) and cytoplasm (cytoplasmic greens) controlling chlorophyll retention in Clark and Harosoy backgrounds were compared from one to three years to their normal counterparts in order to …
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Linkage and Tissue Expression of Enzyme Loci in Interspecific Sunfish (Centrarchidae) Hybrids: Evolutionary and Quantitative Genetic Implications
… their reciprocal hybrids, and four different backcross progeny have been used to investigate the chromosomal locations of enzyme loci, the genetic basis for their differences in tissue expression between species, and the extent the enzyme activity levels in hybrids are related to heterotic …
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Inheritance of resistance to anthracnose stalk rot of corn
… the parental lines, F$\sb1$, F$\sb2$, and both backcross generations. In 1988 and 1989 the study included F$\sb3$ and backcross selfed lines. Individual observed stalk rot reactions within a particular generation were classified as resistant or susceptible by discriminant analysis. Expected …
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Quantitative Trait Loci, and Use of the Theory for Detecting Favorable Alleles in Maize Genetic Materials
… decisions about whether to self in the F1 or backcross to one of the elite inbreds before selfing were indicated.
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Genomics-Based Analysis of Antibody Response to Sheep Red Blood Cells in Chickens
… resource population developed consisted of F1, backcross, and F2 derived from reciprocal crosses of birds from parental lines in the 28th generation of divergent selection for low (L) and high (H) anti-SRBC. The mean anti-SRBC titers of the parental lines were significantly different, with 11.5 …
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Resistance to Aspergillus ear rot and aflatoxin
… involving the parental, F$\sb1$, F$\sb2$, and backcross to the susceptible parent generations. The F$\sb3$ generations were also evaluated for ten of the crosses. In 1993, 11 of the crosses were revaluated using the parental, F$\sb1$, F$\sb2$, F$\sb3$, and backcross to the susceptible and to …
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Gene Mapping of Morphological Traits in Chickens
… eggshell color, vulture hock, and creeper. Ten backcross and/or F2 populations were designed to produce 1,880 individuals. An additional 339 DNA samples from other populations were included. The procedures for gene mapping were: 1. Pooling of DNA samples of backcross or F2 individuals based on …
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Multiple trait analysis for genetic mapping of quantitative trait loci for carcass and beef quality
… purebred Jersey or Limousin cows, producing 784 backcross progeny ( 366 and 418 progeny in Australia and New Zealand, respectively ). The six crossbred sires and all the backcross progeny were genotyped for 285 microsatellite markers ( on average 189 informative loci per sire family ) spread …
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Genetic analysis of the hl locus in maize
… parent DNA retained in the lines developed by backcross breeding was estimated on the basis of the DNA polymorphism detected between the normal (H1H1) and mutant (h1h1) genotypes of the NILS. The extent of the donor parent DNA segment retained in Oh43 hlhl and H95 hlhl was estimated to be 30 …
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Genetic analysis of androgenetic competence and plants regenerated from callus culture of diploid potato species
… in 10 diploid potato species hybrids and 16 backcross progeny. Ten hybrid families including three reciprocals were generated between competent clones of S. phureja and incompetent clones of S. berthaultii, S. microdontum and S. phureja. The F₁ hybrid families segregated for androgenetic …
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Molecular Aspects of Nuclear Genome Involvement in S Cytoplasmic Male-Sterile Maize
… observed as nuclear genomes converted during backcross programs.
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Inheritance of resistance to root rot of tobacco caused by Thielaviopsis basicola (Berk and Br) Ferr
… five parental varieties, all of F₁, F₂, and the backcross populations were included in the summer study when the temperature could not be controlled in the greenhouse. The evaluation of resistance was done on the basis of visible damage to the roots of the seedling plants.
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Effects of Cereal Cyst Nematode Infection on Resistant and Susceptible Barley
… and susceptible early-generation Galleon × Sloop backcross families, making it seem possible that seedling vigour plays a role in CCN resistance. However, comparisons of seedling vigour between resistant (Rha4+) and susceptible (Rha4-) progeny within advanced generation backcross families revealed …
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Host-pathogen interactions in a segregating population of BC2F2 hybrid Castanea dentata and other chesnut hybirds after exposure to hypovirus-containing and hypvirus-free strains of Cryphonectria parasitica
An F2 population of second backcross interspecific hybrid chestnut trees (BC2F2) and the progeny of the Chattanooga Chestnut Tree Project (CCTP) breeding program were exposed to three isogenic strains of Cryphonectria parasitica. Strain Ep155 (virus-free) was used to screen the 4- 7 year old …
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