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  • 1
    Electronic Resource
    Electronic Resource
    Absolute instabilities in gyropeniotron amplifiers (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 3800-3805 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The critical current, oscillation frequency, and characteristic wave number for the excitation of absolute instability in gyropeniotron amplifiers are calculated from the linear dispersion relation by following the Briggs–Bers criterion. Numerical results are presented for some cases of interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860334
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  • 2
    Electronic Resource
    Electronic Resource
    RFLP analysis of genomic regions associated with cooked-kernel elongation in rice (1993)
    Springer
    Theoretical and applied genetics 87 (1993), S. 27-32 
    Details
    ISSN: 1432-2242
    Keywords: Cooked-kernel elongation ; Rice (Oryza sativa L.) ; RFLP markers ; QTL ; Grain quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract As a result of earlier breeding efforts, portions of the genome of “Basmati 370” have been introgressed into a rice breeding line, B8462T3-710. Cooked-kernel elongation was increased in this breeding line to a level equal to that of “Basmati 370”. The objective of this study was to identify and locate quantitative trait loci (QTLs) associated with cooked-kernel elongation in an F3 population derived from a cross between B8462T3710 and the reduced-elongation recurrent parent variety, Dellmont. DNA from the parental lines and “Basmati 370” as a control, were screened for RFLPs using 170 clones chosen to cover the rice genome at intervals of 8 cM on average. Eighteen markers identified RFLPs common to Basmati 370 and B8462T3-710, but different from Dellmont, suggesting possible associations with kernel elongation. The B8462T3-710/Dellmont F3 population was analyzed for segregation of those RFLPs and for kernel elongation. Analysis of variance of the kernel elongation ratio revealed that two markers, 14.6 cM apart on chromosome 8, are significantly associated with this trait (RZ323 P ≤0.005, RZ562 P ≤0.05). Interval mapping suggests a single QTL with a close proximity to RZ323. This QTL was tested in F6 lines derived from the same cross and the presence of the B8462T3-710 segment detected by RZ323 caused a highly significant increase of the kernel elongation ratio (P ≤0.04). In addition, the QTL for kernel elongation and a gene for aroma, which are major components of the grain quality characteristics of Basmati-type rices, showed linkage. The availability of linked markers to the QTL may facilitate early selection for kernel elongation in rice breeding programs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223739
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    RFLP tagging of a gene for aroma in rice (1992)
    Springer
    Theoretical and applied genetics 84 (1992), S. 825-828 
    Details
    ISSN: 1432-2242
    Keywords: Aroma ; Rice (Oryza sativa) ; RFLP markers ; Grain quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We report here the identification of a DNA marker closely linked to a gene for aroma in rice. The DNA marker was identified by testing 126 mapped rice genomic, cDNA, and oat cDNA, clones as hybridization probes against Southern blots, consisting of DNA from a pair of nearly isogenic lines (NILs) with or without the aroma gene. Chromosomal segments introgressed from the donor genome were distinguished by RFLPs between the NILs. Linkage association of the clone with the gene was verified using an F3 segregating for aroma. Cosegregation of the scented phenotype and donor-derived allele indicated the presence of linkage between the DNA marker and the gene. RFLP analysis showed that the gene is linked to a single-copy DNA clone, RG28, on chromosome 8, at a distance of 4.5 cM. The availability of a linked DNA marker may facilitate early selection for the aroma gene in rice breeding programs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227391
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Homoeologous relationships of rice, wheat and maize chromosomes (1993)
    Springer
    Molecular genetics and genomics 241 (1993), S. 483-490 
    Details
    ISSN: 1617-4623
    Keywords: Comparative maps ; Dysploidy decrease ; Translocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A set of cDNA clones, which had previously been mapped onto wheat chromosomes, was genetically mapped onto the chromosomes of rice. The resulting comparative maps make it possible to estimate the degree of linkage conservation between these two species. A number of chromosomal rearrangements, some of which must have involved interchromosomal translocations, differentiate the rice and wheat genomes. However, synteny of a large proportion of the loci appears to be conserved between the two species. The results of this study, combined with those from a recently published comparative map of the rice and maize genomes, suggest that rice, wheat and maize share extensive homoeologies in a number of regions in their genomes. Some chromosomes (e.g. chromosome 4 in rice, chromosomes 2 and 2S in wheat and maize, respectively) may have escaped major rearrangement since the divergence of these species from their last common ancestor. Comparative maps for rice, wheat and maize should make it possible to begin uniting the genetics of these species and allow for transfer of mapping information (including centromere positions) and molecular marker resources (e.g. RFLP probes) between species. In addition, such maps should shed light on the nature of chromosome evolution that accompanied the radiation of grasses in the early stages of plant diversification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279889
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    Paper (German National Licenses)
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