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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of a wheat class Ib chitinase gene differentially induced in isogenic lines by infection with Puccinia graminis
    Amsterdam : Elsevier
    Plant Science 103 (1994), S. 177-187 
    Details
    ISSN: 0168-9452
    Keywords: Chitinase ; Gene activation ; Plant resistance ; Puccinia graminis ; Triticum aestivum
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-9452(94)90206-2
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  • 2
    Electronic Resource
    Electronic Resource
    Adaptation of semidwarf wheat cultivars to rainfed conditions (1977)
    Springer
    Euphytica 26 (1977), S. 129-139 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; grain yield ; tall plant ; semidwarf plant ; adaptation ; dryland ; regression analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary With a view to determining the comparative adaptation of semidwarf wheats to rainfed conditions, adaptation analyses were carried out on grain yield data of the 6th and 7th International Spring Wheat Yield Nurseries of the International Maize and Wheat Improvement Centre. Sites were chosen which had not received irrigation: across a combined total of 44 such sites, yield variation was closely related to growing seasonal rainfall. Using these sites, yields of thirty-three common cultivars. Norin 10-derived semidwarf cultivars plus tall ones, were regressed against site mean yield to give a regression slope (b) and deviations from the regression (sd 2) for each cultivar. Semidwarf cultivars generally showed higher mean yields and larger regression slopes (b 〉 0.9) than tall cultivars from lower latitudes. Tall cultivars from higher latitudes showed the lowest mean yields and the lowest b values (〈 0.7). No consistent trends in sd 2 were evident. Despite the greater regression slopes of semidwarf wheats, the best yields under all but the lowest yielding (driest) conditions were given by certain semidwarf cultivars; these had high mean yields and b values close to 1.0 (for example Tobari 66, Inia 66, Pato ArGentino and Sonalika). In contrast other semiwdarfs (notably Chenab 70) of similar mean yield, plant height and phenology, were not well adapted to the drier conditions as indicated by b values close to 1.3. The usefulness of the regression technique and the implications of these results for selection of semidwarf wheats adapted to drier conditions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032078
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of major dwarfing genes on yield potential in spring wheats (1990)
    Springer
    Euphytica 46 (1990), S. 51-56 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; yield potential ; dwarfing genes ; Norin-10 ; Tom Thumb ; yield components ; selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A composite convergent cross of 16 spring wheat parents produced a set of unselected progeny lines among which the major dwarfing genes, Rht1, Rht2 and Rht3, were distributed against a common random genetic background. Random subsets of these lines were grown under irrigation and optimal conditions in 4 experiments with replicated bordered plots in southern New South Wales in order to measure the dwarfing gene effect on yield potential. The dwarfing gene composition of each line was determined by test crossing and seedling responsiveness to gibberellic acid. Lodging was negligible in the two experiments in 1982. While present in the two in 1983, it was not strongly associated with yield. Grain yield levels were appropriately high (mean 5.9 t/ha). In all but 1 experiment the Rht1+Rht2 dwarf genotypes gave highest yields while the Rht3 group yielded on average 3% lower, Rht2 9% lower, Rht1 11% lower, and the non-dwarf or tall group yielded 24% lower. These yield differences were positively associated with harvest index, kernels per m2 and kernels per spike, but negatively associated with mature plant height. Even within major dwarfing gene classes, grain yield was significantly and negatively associated with height.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00057618
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  • 4
    Electronic Resource
    Electronic Resource
    Long-term association of locations for testing spring bread wheat (1993)
    Springer
    Euphytica 72 (1993), S. 95-106 
    Details
    ISSN: 1573-5060
    Keywords: pattern analysis ; genotype x environment interaction ; grain yield ; mega-environments ; Triticum aestivum ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The International Spring Wheat Yield Nursery (ISWYN) has been distributed annually since 1964 and the results provide a base for investigating relationships among locations. Ordination and clustering of locations was conducted using 26 years of grain yield data. Ordination and clusters based on the discrimination of germplasm were compared with ‘mega-environments’, which are groupings of locations defined by CIMMYT on the basis of climatic factors and perceptions of major biotic and abiotic stresses. Discrepancies among mega-environmental groupings, clusters and ordinations may identify locations for which major stresses affecting wheat yield are yet unidentified. Major environmental discriminators were latitude and the presence or absence of stress, although there was little association of locations due to limited moisture availability. We identified two major spring wheat environments, typified as Asian and European, and suggest the mega-environmental classification does not explain all significant associations among locations. Location groupings based on discrimination of germplasm should be considered in parallel to mega-environments on a regular basis and we propose breeding for a base of broadly adapted germplasm to which specific stress tolerances are incorporated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023777
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