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  • 1
    Electronic Resource
    Electronic Resource
    Identification and characterization of quantitative trait loci related to lodging resistance and associated traits in bread wheat (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 124 (2005), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Lodging is a major constraint to increasing yield in many crops, but is of particular importance in the small-grained cereals. This study investigated the genetic control of lodging and component traits in wheat through the detection of underlying quantitative trait loci (QTL), The analysis was based on the identification of genomic regions which affect various traits related to lodging resistance in a population of 96-doubled haploid lines of the cross ‘Milan’בCatbird’, mapped using 126-microsatellite markers. Although major genes related to plant height (Rht genes) were responsible for increasing lodging resistance in this cross, several other traits independent of plant height were shown to be important such as fool and shoot traits, and various components of plant yield. Yield components such as grain number and weight were shown to be an indicator of plant susceptibility to lodging. QTL for lodging and associated traits were found on chromosomes IB, ID. 2B. 2D. 4B, 4D. 6D and 7D. QTL for yield and associated traits were identified on chromosomes IB, ID. 2A. 2B. 2D. 4D and 6A,
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.2005.01070.x
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  • 2
    Electronic Resource
    Electronic Resource
    Mapping antixenosis genes on chromosome 6A of wheat to greenbug and to a new biotype of Russian wheat aphid (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 124 (2005), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Greenbug and Russian wheat aphid (RWA) are two devastating pests of wheat. The first has a long history of new biotype emergence and recently. RWA resistance has just started to break down. Thus, it is necessary to find new sources of resistance that will broaden the genetic base against these pests in wheat. Seventy-five doubled haploid recombinant (DHR) lines for chromosome 6A from the F1 of the cross between “Chinese Spring’ and the “Chinese Spring (Synthetic 6A) (Triticum dicoccoides × Aegilops tauschii)” substitution line were used as a mapping population for testing resistance to greenbug biotype C and to a new strain of RWA that appeared in Argentina in 2003. A quantitative trait locus (QTL) (br antixenosis to greenbug was significantly associated with the marker loci Xgwm1009 and Xgwm1185 located in the centromere region of chromosome 6A. Another QTL which accounted for most of the antixenosis against RWA was associated with the marker loci Xgwm1291 and Xiinni1150. both located on the long arm of chromosome 6A. This is the first report of greenbug and RWA resistance genes located on chromosome 6A. It is also the first report of antixenosis against the new strain of RWA. As most of the RWA resistance genes present in released cultivars have been located in [he D-genome, it is highly desirable to find new sources in other genomes to combine the existing resistance genes with new sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.2005.01082.x
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  • 3
    Electronic Resource
    Electronic Resource
    Developmental responses to vernalization in wheat deletion lines for chromosomes 5A and 5D (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 122 (2003), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The aim of this investigation was to test the developmental patterns of deletion lines, generated for chromosome arms 5AL and 5DL in the variety ‘Chinese Spring’ (CS) under vernalized and non-vernalized treatments. Plants were grown in controlled conditions under saturating daylength. Time to heading and the duration of particular phases before flowering were recorded, and leaf and spikelet production rates and numbers were analysed. The lines lacking Vrn-A1 and Vrn-D1 were delayed in time to heading under non-vernalized conditions, because of the lengthening of the emergence to floral initiation phase (EM-FI) and the terminal spikelet to heading phase (TS-H). Differences in final leaf numbers corresponded to longer durations of the EM-FI phase. The absence of Vrn-A1 and Vrn-D1 apparently decreased the number of spikelets by a lower primordium production rate, even though the duration of the FI-TS phase was longer or equal to CS. The sensitivity to vernalization in lines where the Vrn genes were deleted was much higher.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2003.00749.x
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  • 4
    Electronic Resource
    Electronic Resource
    Mapping quantitative trait loci in wheat for resistance against greenbug and Russian wheat aphid (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 123 (2004), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Breeding for genetic resistance against greenbug and Russian wheat aphid (RWA) is the most effective way of controlling these widespread pests in wheat. Earlier work had shown that chromosome 7D of a synthetic hexaploid wheat, ‘Synthetic’ (T. dicoccoides × Ae. squarrosa) (AABB × DD) gave resistance when transferred into the genetic background of an aphid-susceptible cultivar, ‘Chinese Spring’, as the recipient. To map the genes involved, a set of 103 doubled haploid recombinant substitution lines was obtained from crossing the 7D substitution line with the recipient, and used to determine the number and chromosomal location of quantitative trait loci (QTL) controlling antixenosis and antibiosis types of resistance. Antixenosis to RWA was significantly associated with marker loci Xpsr687 on 7DS, and Xgwm437 on 7DL. Antibiosis to greenbug was associated with marker loci Xpsr490, Rc3 (on 7DS), Xgwm44, Xgwm111, Xgwm437, Xgwm121 and D67 (on 7DL). Similarly, antibiosis to RWA was linked to loci Xpsr490, Rc3, Xgwm44, Xgwm437 and Xgwm121. At least two QTL in repulsion phase, one close to the centromere either on the 7DS or 7DL arms, and a second distal on 7DL could explain antibiosis to RWA and, partially, this mechanism against greenbug.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.2004.00995.x
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  • 5
    Electronic Resource
    Electronic Resource
    Studies of the Genetic Relationship between Anther Culture and Somatic Tissue Culture Abilities in Wheat (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 100 (1988), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A population of thirty-eight doubled haploid lines, developed from the F1 between two wheat parents differing in anther culture and somatic tissue culture responses, ‘was used to examine the genetical control of responses to these in vitro systems.During anther culture genetic variation between lines was exhibited for frequencies of callus induction., embryo production and embryo regeneration rates. In addition the relative frequencies of green and albino plants was shown to be genotype dependent. However, there was no correlation, between the frequencies of embryo production and the regeneration rate of those embryos suggesting an independent genetic control of these two components. Transgressive segregation for performance was observed for all components indicating that at least two genes are involved in the response of each, and lines for improved performance, combining high ernoryo production rates and good regeneration capacity were identified.No genetic variation for frequencies of callus induction from immature embryos was observed in this cross. However, genetic variation for the regeneration frequencies of plants was observed. Lines with an improved tissue culture response over the two parents were identified.There was no correlation between the performance of lines in anther culture and somatic tissue culture, indicating separate genetical control, and lines with alternative levels of response to the two systems were identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1988.tb00213.x
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  • 6
    Electronic Resource
    Electronic Resource
    Doubled haploid production in Turkish durum wheats using crosses with maize (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 116 (1997), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Durum wheats cultivated in the Middle Anatolia region of Turkey (Triticum durum cvs ‘Kunduru’, ‘Berkmen’ and ‘Cakmak’) were crossed with maize to evaluate their capacity for haploid embryo and doubled haploid (DH) plant production. A total of 2960 florets were crossed with maize and 13.7% of the florets produced haploid embryos across the three varieties. Haploid embryo and plant regeneration frequencies were highest in ‘Kunduru’, but colchicine doubling was less successful with this genotype. There were statistically significant differences between ‘Cakmak’ and other genotypes for embryo yield (P 〈 0.01). Overall, 52.3% of all embryos differentiated, but there were no geno-typic differences in differentiation frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1997.tb01002.x
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  • 7
    Electronic Resource
    Electronic Resource
    Assignment of the denso Dwarfing Gene to the Long Arm of Chromosome 3(3H) of Barley by Use of RFLP Markers (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 111 (1993), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: RFLP analysis of 105 doubled haploid lines from a cross between the barley varieties ‘Magnum’ and ‘Goldmarker’ located the denso dwarfing gene on the long arm of chromosome 3(3H), approximately 8 cM distal to the RFLP locus Xpsrl70. Lines with the denso gene showed a distinctive prostrate juvenile growth habit and tended to have later ear emergence times and lower plant grain weights, ear grain weights and 50 grain weights.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1993.tb00630.x
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  • 8
    Electronic Resource
    Electronic Resource
    Luciferase as a reporter gene for transformation studies in rice (Oryza sativa L.) (1999)
    Springer
    Plant cell reports 18 (1999), S. 715-720 
    Details
    ISSN: 1432-203X
    Keywords: Key wordsOryza sativa ; Luciferase gene ; Transient expression ; luc ; Luminograph ; Luminometer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Transformed rice plants of var `TN1' were regenerated from immature embryos following particle bombardment with a construct containing the firefly luciferase gene as a reporter gene and the hygromycin resistance gene as a selectable marker. Expression of the luciferase gene in the presence of the substrate luciferin was visualised in the calli derived from bombarded immature embryos and in the leaves and roots of the regenerated transformed plants using a low light imaging system (luminograph). Embryogenic callus proliferation and plant regeneration were unaffected by luciferin treatment and luminograph screening. The quantitative Luc assay using samples of leaf tissue from the segregating generations gave early information about the homozygous and hemizygous state of the luc transgene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050648
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of linkage and interaction in a comparison of theoretical populations derived by diploidized haploid and single seed descent methods (1977)
    Springer
    Theoretical and applied genetics 49 (1977), S. 111-115 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Comparisons were made between the genetic means and variances of a quantitative trait determined by 8 loci in simulated populations of lines derived by diploidizing haploids (DH) on the one hand and by single seed descent (SSD) on the other. In the absence of linkage no differences between the populations were observed, but when linkage was present, recombination was more frequent in the SSD populations as indicated by the relative differences in variance between these and the DH populations. In addition, differences in means between the populations derived by the two methods were observed when non-allelic interaction was present. The direction and magnitude of the differences in both means and variances depended upon the linkage phase, the recombination frequency and the presence or absence of interaction. The conclusion was drawn that the SSD method was to be preferred from theoretical considerations although in practice the choice of method will also depend upon practical and technical factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00281708
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  • 10
    Electronic Resource
    Electronic Resource
    Predicting the frequencies of transgressive segregants for yield and yield components in wheat (1982)
    Springer
    Theoretical and applied genetics 62 (1982), S. 127-134 
    Details
    ISSN: 1432-2242
    Keywords: Wheat ; Genetical analysis ; Cross prediction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Genetical analysis of the F2 triple test cross design combined with conventional early generations was used to elucidate the genetical control of yield and yield components in two crosses of winter wheat. From estimates of the additive, {d}, and additive X additive, {i}, components of means, together with the additive genetical variance, D, predicted frequencies of recombinant inbred lines that would transgress the parental range were calculated for each cross. The accuracy of predictions was evaluated by comparing expected frequencies with observed numbers in populations of F6 lines previously developed by single seed descent. For both crosses and all characters where an adequate genetical model was found to explain the observed variation between the early generations, good agreement between predicted and observed frequencies of transgressive segregants was obtained. Furthermore, for characters exhibiting significant epistasis, allowance for additive X additive {i} epistasis in the prediction equations was sufficient to allow for skewness of the recombinant inbred population. These results demonstrate that cross performance in wheat can be predicted from genetical analysis of early generations, and the value of this approach in breeding new varieties is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293344
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