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  • 1
    Electronic Resource
    Electronic Resource
    Analyzing quantitative trait loci for yield using a vegetatively replicated F2 population from a cross between the parents of an elite rice hybrid (2000)
    Springer
    Theoretical and applied genetics 101 (2000), S. 248-254 
    Details
    ISSN: 1432-2242
    Keywords: Key words Oryza sativa L. ; Ratoon ; Molecular marker ; QTL
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Although F2s are the most informative populations for genetic analysis, it has been difficult to use F2 populations directly for QTL analysis because it is usually difficult to assess the reliability of the data, due to an inability to estimate the experimental errors. In this study, we performed a QTL analysis for yield and yield-component traits of an F2 population based on data from replicated field trials over 2 years using vegetative shoots of ratooned plants, making use of the ratooning habit of rice. The objective of this study was to explore the possibility of conducting QTL analyses directly based on an F2 population by means of ratooning plants. The experimental population was from a cross between ’Zhenshan 97’ and ’Minghui 63’, the parents of ’Shanyou 63’, an elite rice hybrid widely grown in China. A genetic linkage map containing 151 molecular markers was constructed for QTL mapping. A total of 20 distinct QTLs were detected; eight of these were detected in both years and remaining 12 in only 1 year. Compared with the results of our previous analysis of the F2:3 families from the same cross, it was shown that most of the QTLs detected in the ratooned F2 population were also detected in the F2:3 population. However, the estimates of both additive and dominant types of genetic effects for many of the QTLs based on F2 ratoons were substantially larger than those based on F2:3 families. The results indicate that vegetatively ratooned F2 populations may have considerable utility in the mapping of QTLs, especially if dominant types of gene actions are of concern, although there were certain technical limitations in making use of such populations in the experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051476
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  • 2
    Electronic Resource
    Electronic Resource
    Genetic bases of appearance quality of rice grains in Shanyou 63, an elite rice hybrid (2000)
    Springer
    Theoretical and applied genetics 101 (2000), S. 823-829 
    Details
    ISSN: 1432-2242
    Keywords: Key words Rice quality ; Grain shape ; Endosperm opacity ; Genetic analysis ; Molecular marker
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Appearance quality of the rice grain represents a major problem of rice production in many rice-producing areas of the world, especially in hybrid rice production in China. In this study, we conducted a molecular marker-based genetic analysis of the traits that are determinants of the appearance quality of rice grains, including traits specifying grain shape and endosperm opacity. The materials used in the analysis included an F2:3 population and an F10 recombinant inbred line population from a cross between the parents of Shanyou 63, the most widely grown rice hybrid in China. Molecular marker-based QTL (quantitative trait locus) analyses revealed that grain length and grain width were each controlled by a major QTL accounting for a very large proportion of the genetic variation, plus one or two minor QTLs each explaining a small proportion of the genetic variation. The major QTLs can be detected in both the F2:3 and recombinant inbred line population using both paddy rice and brown rice, whereas the minor QTLs were detected only occasionally. The QTL located in the interval of RG393-C1087 on chromosome 3 is the major locus for grain length, and the one in the interval RG360-C734a on chromosome 5 plays a major role in determining grain width. Similarly, white belly, which largely determines the opacity of the endosperm, is almost entirely controlled by a major locus on chromosome 5, located in the same genomic region as the major QTL for grain width. The implications of the results with respect to hybrid rice improvement were discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051549
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic diversity and differentiation of indica and japonica rice detected by RFLP analysis (1992)
    Springer
    Theoretical and applied genetics 83 (1992), S. 495-499 
    Details
    ISSN: 1432-2242
    Keywords: Oryza sativa ; Phenotypic diversity ; Differentiation ; Randomization test ; RFLP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Genetic diversity and differentiation in indica and japonica groups of the cultivated rice (Oryza sativa L.) were studied by assaying DNA restriction fragment length polymorphisms of 12 indica and 14 japonica rice lines digested with three restriction endonucleases. A total of 49 probes were selected to represent the entire RFLP map at intervals of 20–30 cM. It was shown that 95 of the 145 possible probe/enzyme combinations, involving 43 probes and all three enzymes, detected restriction fragment length variation, and the degree of polymorphism varied greatly from one probe/enzyme combination to another. These results demonstrate that indica rice is genetically more diverse than japonica type. Significant differentiation between the two rice groups was detected by 33 probes representing 11 of the 12 rice chromosomes. It was deduced that the processes leading to differentiation involved a combination of molecular events that include base substitutions and insertion/deletions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226539
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  • 4
    Electronic Resource
    Electronic Resource
    Worldwide pattern of multilocus structure in barley determined by discrete log-linear multivariate analyses (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 121-128 
    Details
    ISSN: 1432-2242
    Keywords: Barley ; Log-linear multivariate analyses ; Multilocus associations ; Enzyme loci
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Data from the electrophoretic assay for seven enzyme loci of 1,032 accessions of cultivated barley, Hordeum vulgare L., from the USDA world barley collection were analyzed for multilocus structure using discrete log-linear multivariate techniques. Three major steps were involved in the analysis: (i) identification and elimination of terms that have inconsequential effects in multilocus association; (ii) construction of a log-linear model that best describes the complete multilocus structure of the genetic system; and (iii) evaluation of each of the association terms included in the model. The results of analyses of two subsets of loci show that the multilocus genetic system of cultivated barley, including loci located on different chromosomes, is organized into hierarchically structured complexes of loci. Multilocus structure differs in various geographical regions of the world. The structure of barleys from Southwest Asia, the putative center of origin for cultivated barley, is intermediate for both subsets of loci. Differences increased progressively across the Eurasian-African landmasses in each direction with increasing distance from Southwest Asia, with the consequence that the barleys from West Europe, East Asia, and Ethiopia are maximally different from those of Southwest Asia and Middle South Asia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224025
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  • 5
    Electronic Resource
    Electronic Resource
    The three important traits for cooking and eating quality of rice grains are controlled by a single locus in an elite rice hybrid, Shanyou 63 (1999)
    Springer
    Theoretical and applied genetics 99 (1999), S. 642-648 
    Details
    ISSN: 1432-2242
    Keywords: Key words Rice quality ; Amylose content ; Gel consistency ; Gelatinization temperature ; Genetic analysis ; Molecular marker
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The cooking and eating quality of the rice grain is one of the most serious problems in many rice-producing areas of the world. In this study, we conducted a molecular marker-based genetic analysis of three traits, amylose content (AC), gel consistency (GC) and gelatinization temperature (GT), that are the most important constituents of the cooking and eating quality of rice grains. The materials used in the analysis included F2 seeds, an F2:3 population, and an F9 recombinant inbred-line population from a cross between the parents of ’Shanyou 63’, the most widely grown hybrid in rice production in China. Segregation analyses of these three generations showed that each of the three traits was controlled by a single Mendelian locus. Molecular marker-based QTL (quantitative trait locus) analyses, both by one-way analysis of variance using single marker genotypes and by whole-genome scanning with MAPMAKER/QTL, revealed a single locus that controls the expression of all three traits. This locus coincided with the Wx region on the short arm of chromosome 6, indicating that all three traits were either controlled by the Wx locus or by a genomic region tightly linked to this locus. This finding has provided clues to resolving the molecular bases of GC and GT in future studies. The results also have direct implications for the quality improvement of rice varieties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051279
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  • 6
    Electronic Resource
    Electronic Resource
    Mapping and genetic analysis of two fertility restorer loci in the wild-abortive cytoplasmic male sterility system of rice (Oryza sativa L.) (1997)
    Springer
    Euphytica 98 (1997), S. 183-187 
    Details
    ISSN: 1573-5060
    Keywords: fertility restoration ; hybrid rice ; linkage analysis ; Oryza sativa ; RFLP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Hybrid varieties developed by making use of the wild abortive cytoplasmic male sterility system account for 90% of hybrid rice produced. Previous inheritance studies have established that the fertility restoration in this system is controlled by two major loci, but the chromosomal locations of the fertility restorer (Rf) loci have yet to be resolved. In this study we determined the genomic locations of the two Rf loci by their linkage to molecular markers. The Rf gene containing regions were identified by surveying two bulks, made of 30 highly fertile and 46 highly sterile plants from a large F2 population of the cross between Zhenshan 97A and Minghui 63, with RFLP markers covering the entire rice genome. The survey identified two likely Rf gene containing regions, located on chromosomes 1 and 10 respectively. This was confirmed by ANOVA using a large random sample from the same F2 population and also with a genome-wide QTL analysis of a test-cross population. The results also showed that both loci have major effects of almost complete dominance on fertility restoration and the effect of the locus on chromosome 10 is larger than the one on chromosome 1. The two loci acted as a pair of classical duplicate genes; a single dominant allele at one of the two loci would suffice to restore the fertility to normal or nearly normal. Closely linked markers identified in this study may be used for marker assisted selection in hybrid rice breeding programs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003165116059
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    Paper (German National Licenses)
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