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  • 1
    Electronic Resource
    Electronic Resource
    Molecular-marker-facilitated investigation on the ability to stimulate N2 fixation in the rhizosphere by irrigated rice plants (1995)
    Springer
    Theoretical and applied genetics 91 (1995), S. 1177-1183 
    Details
    ISSN: 1432-2242
    Keywords: Oryza sativa L. ; Atom 15N% excess ; N2 fixation ; Restriction fragment length polymorphism (RFLP)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An F2 population, consisting of 231 individuals derived from a cross between rice cultivars with a similar growing duration, Palawan and IR42, was utilized to investigate the genetic nature of rice varietal ability to stimulate N2 fixation in the rice rhizosphere. To assess rhizospheric N2 fixation, an isotope-enriched 15N dilution technique was employed, using 15N-stabilized soil in pots. IR42, an indica variety, had 23% higher N derived from fixation (Ndfa) than Palawan, a javanica genotype. Normal segregation of atom% 15N excess was obtained in the F2 population, with an average of 0.218 with 8% of plants below IR42 (0.188) and 10% of plants above Palawan (0.248). One-hundred-and-four RFLP markers mapped on 12 chromosomes were tested for linkage to the putative QTLs. Significant (P〈0.01) associations between markers and segregation of atom% 15N excess were observed for seven marker loci located on chromosomes 1, 3, 6 and 11. Four QTLs defined by the detected marker loci were identified by interval-mapping analysis. Additive gene action was found to be predominant, but for at least one locus, dominance and partial dominance effects were observed. Significant (P〈0.01) epistatic effects were also identified. Individual marker loci detected between 8 and 16% of the total phenotypic variation. All four putative QTLs showed recessive gene action, and no phenotypic effects associated with heterozygosity of marker loci were observed. The results of this study suggest that rice genetic factors can be identified which affect levels of atom% 15N excess in the soil by interacting with diazotrophs in the rice rhizosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220926
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  • 2
    Electronic Resource
    Electronic Resource
    RFLP mapping of QTLs for yield and related characters in rice (Oryza sativa L.) (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 920-927 
    Details
    ISSN: 1432-2242
    Keywords: Oryza sativa L. ; RFLP ; Yield traits ; QTLs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Quantitative triat loci (QTLs) for yield and related traits in rice were mapped based on RFLP maps from two indica/indica F2 populations, Tesanai 2/CB and Waiyin 2/CB. In Tesanai 2/CB, 14 intervals carrying QTLs for eight traits were detected, including 3 for grain weight per plant (GWT), 2 for number of panicles per plant (NP), 2 for number of grains per panicle (NG), 1 for total number of spikelets per panicle (TNS), 1 for spikelet fertility (SF), 3 for 1000-grain weight (TGWT), 1 for spikelet density (SD), and 1 for number of first branches per main panicle. The 3 QTLs for GWT were located on chromosomes 1, 2, and 4, with 1 in each chromosome. The additive effect of the single locus ranged from 2.0 g to 9.1 g. A major gene (np4) for NP was detected on chromosome 4 within the interval of RG143–RG214, about 4cM for RG143, and this locus explained 26.1% of the observed phenotypic variance for NP. The paternal allele of this locus was responsible for reduced panicles per plant (3 panicles per plant). In another population, Waiyin 2/CB, 12 intervals containing QTLs for six of the above-mentioned traits were detected, including 3 for GWT, 2 for each of NP, TNS, TGWT and SD, 1 for SF. Three QTLs for GWT were located on chromosome 1, 4, and 5, respectively. The additive effect of the single locus for GWT ranged from 6.7 g to 8.8 g, while the dominance effect was 1.7–11.5 g. QTL mapping in two populations with a common male parent is compared and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224031
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  • 3
    Electronic Resource
    Electronic Resource
    Genes/QTLs affecting flood tolerance in rice (2000)
    Springer
    Theoretical and applied genetics 101 (2000), S. 1074-1081 
    Details
    ISSN: 1432-2242
    Keywords: Key words Elongation ability ; Submergence tolerance ; Oryza sativa L. ; Epistasis ; Abiotic stress ; Molecular markers ; Differential gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The adaptation of deepwater rice to flooding is attributed to two mechanisms, submergence tolerance and plant elongation. Using a QTL mapping study with replicated phenotyping under two contrasting (water qualities) submergence treatments and AFLP markers, we were able to identify several genes/QTLs that control plant elongation and submergence tolerance in a recombinant inbred rice population. Our results indicate that segregation of rice plants in their responses to different flooding stress conditions is largely due to the differential expression of a few key elongation and submergence tolerance genes. The most important gene was QIne1 mapped near sd-1 on chromosome 1. The Jalmagna (the deepwater parent) allele at this locus had a very large effect on internal elongation and contributed significantly to submergence tolerance under flooding. The second locus was a major gene, sub1(t), mapped to chromosome 9, which contributed to submergence tolerance only. The third one was a QTL, QIne4, mapped to chromosome 4. The IR74 (non-elongating parent) allele at this locus had a large effect for internal elongation. An additional locus that interacted strongly with both QIne1 and QIne4 appeared near RG403 on chromosome 5, suggesting a complex epistatic relationship among the three loci. Several QTLs with relatively small effects on plant elongation and submergence tolerance were also identified. The genetic aspects of these flooding tolerance QTLs with respect to patterns of differential expression of elongation and submergence tolerance genes under flooding are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051582
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular markers linked to genes underlying seedling tolerance for ferrous iron toxicity (1997)
    Springer
    Plant and soil 196 (1997), S. 317-320 
    Details
    ISSN: 1573-5036
    Keywords: ferrous iron toxicity ; molecular markers ; Oryza sativa L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A double haploid (DH) population consisting of 123 lines derived from a japonica variety, Azucena, and an indica variety, IR64, and 100 BC1F1 (Azucena) lines were cultivated hydroponically using two treatments: one with excess Fe2+ at the concentration of 250 mg L-1 and a control with standard nutrient solution. Genotypic tolerance was evaluated using an index scale based on degree of leaf bronzing and relative decease in shoot dry weight (RDSDW) Toxic symptoms were not observed for Azucena and BClFl plants. In contrast, index values for the DH population indicated segregation for tolerance, and IR64 was moderately sensitive. Molecular marker loci associated with variations in index values and in RDSDW, and gene loci for tolerance were detected using 175 Markers mapped on all 12 chromosomes by single marker loci and interval mapping. Two gene loci were identified to be flanked by RG345 and RG381, and linked to RG810, respectively, on chromosome 1 for both index values and RDSDW. They explained 32% and 13% of the total variation in the index values, and 15% and 21 % in the RDSDW in the population, respectively. The variation in RDSDW was also explained by a locus linked to RG978 on chromosome 8 by about 10%. Comparison of the two marker genotypic class means indicated that the tolerant alleles were from Azucena at the first locus on chromosome 1 and the locus on chromosome 8, and that at the second locus on chromosome 1 from IR64.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004288427140
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