Maize Single Crosses
Mostrando 13-24 de 24 artigos, teses e dissertações.
-
13. Biometrical aspects of QTL detection in cultivated species. / Aspectos biométricos da detecção de QTL S ("Quantitative Trait Loci") em espécies cultivadas.
In general terms, QTL mapping di®ers from other research ac-tivities in genetics. Being basically a multiple test procedure, problems arise which are related to the joint level of signi¯cance of the analysis, and consequently, to its power. Using computational simulation of data, the power of simple marker analysis, carried out through multiple linear regr
Publicado em: 2001
-
14. Uso de linhagens parcialmente endogâmicas S3 para a produção de híbridos simples de milho. / Use of partly inbred s3 lines for the production of maize single-crosses.
Linhagens endogâmicas (F@1,0) são usualmente utilizadas para a produção de híbridos de milho. Devido a elevada depressão por endogamia no milho, as linhagens endogâmicas apresentam baixa produtividade, encarecendo o custo das sementes de híbridos simples e tornando-os inacessíveis para grande parte dos agricultores dos países em desenvolvimento. Um
Publicado em: 2001
-
15. O potencial osmotico em mutantes de endosperma de milho e sua interação com caracteristicas fisicas e com a atividade da RNase da semente
Four near isogenic inbreds of maize sinlge mutants homozygous for the opaque-2, shrunken, shrunken-2 and sugary genes, and their normal counterparts, as well as the single cross HS 7777, were used to study the reIationship among osmotic potential, dry weight, water content and RNase activity in the endosperm. The plants were grown on adjoining plots ate the
Publicado em: 1982
-
16. Heritability of fumonisin B1 production in Gibberella fujikuroi mating population A.
Fumonisins are mycotoxins produced by strains belonging to several different mating populations of Gibberella fujikuroi (anamorphs, Fusarium section Liseola), a major pathogen of maize and sorghum worldwide. We studied the heritability of fumonisin production in mating population A by crossing fumonisin-producing strains collected from maize and sorghum in t
-
17. Genetics of Fertility Restoration in the C-Group of Cytoplasmic Male Sterility in Maize
The genetics of fertility restoration of cms-C group cytoplasm of maize was studied using crosses involving stable maintainer lines and lines that restored full pollen fertility. Pollen fertility in the sources of cms-C sterile cytoplasms studied was restored by a single dominant restorer (Rf4) gene. The fertility restoration was sporophytic. Allelism tests
-
18. Dissecting the maize genome by using chromosome addition and radiation hybrid lines
We have developed from crosses of oat (Avena sativa L.) and maize (Zea mays L.) 50 fertile lines that are disomic additions of individual maize chromosomes 1-9 and chromosome 10 as a short-arm telosome. The whole chromosome 10 addition is available only in haploid oat background. Most of the maize chromosome disomic addition lines have regular transmission;
National Academy of Sciences.
-
19. A Complete Set of Maize Individual Chromosome Additions to the Oat Genome1
All 10 chromosomes of maize (Zea mays, 2n = 2x = 20) were recovered as single additions to the haploid complement of oat (Avena sativa, 2n = 6x = 42) among F1 plants generated from crosses involving three different lines of maize to eight different lines of oat. In vitro rescue culture of more than 4,300 immature F1 embryos resulted in a germination frequenc
American Society of Plant Physiologists.
-
20. Fate of DNA encoding hygromycin resistance after meiosis in transformed strains of Gibberella fujikuroi (Fusarium moniliforme).
Stability of foreign DNA transformed into a novel host is an important parameter in decisions to permit the release of genetically engineered microorganisms into the environment. Meiotic instability of transformed DNA has been reported in fungi such as Ascobolus, Aspergillus, and Neurospora. We used strains of Gibberella fujikuroi (Fusarium moniliforme) tran
-
21. Ribosomal Gene Structure, Variation and Inheritance in Maize and Its Ancestors
We have examined the structure of nuclear genes coding for ribosomal RNAs in maize and its wild relatives, the teosintes and Tripsacum. Digestion of the rDNA (genes coding for 18S, 5.8S and 26S RNAs) with 15 restriction endonucleases (with six base pair recognition sites) yields essentially a single map for the approximately 10,000 repeat units within an ind
-
22. Heterogeneity of Maize Cytoplasmic Genomes among Male-Sterile Cytoplasms
Maize mitochondrial and chloroplast DNA's were prepared from normal (fertile) lines or single crosses and from members of the T, C, and S groups of male-sterile cytoplasms. Restriction endonucleases HindIII, BamI, EcoRI, and SalI were used to restrict the DNA, and the resultant fragments were electrophoresed in agarose gels. The results show that the N (fer
-
23. Centromeric Effect on the Degree of Nonrandom Disjunction in the Female DROSOPHILA MELANOGASTER
From crosses of females possessing a heteromorphic X-chromosome bivalent, FR1/+, the shorter crossover products were recovered on the average more frequently than the longer reciprocals as predicted by Novitski's (1951) hypothesis of nonrandom disjunction (NRD). The present study stemmed from an unexpected result of these crosses. Evidence for a centromeric
-
24. Chromosomal organization of TOX2, a complex locus controlling host-selective toxin biosynthesis in Cochliobolus carbonum.
Race 1 isolates of the filamentous fungus Cochliobolus carbonum are exceptionally virulent on certain genotypes of maize due to production of a cyclic tetrapeptide, HC-toxin. In crosses between toxin-producing (Tox2+) and toxin-nonproducing (Tox2-) isolates, toxin production segregates in a simple 1:1 pattern, suggesting the involvement of a single genetic l