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  • 1
    Electronic Resource
    Electronic Resource
    Assessment of drought resistance in 20 accessions of Triticum aestivum and related species I. Total dry matter and grain yield stability (1991)
    Springer
    Euphytica 56 (1991), S. 7-14 
    Details
    ISSN: 1573-5060
    Keywords: Triticum ; drought resistance ; grain yield stability ; dry matter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Interspecific hybridisation has been suggested to improve the resistance of crops to biotic and abiotic stresses. To identify sources of resistance to drought which could be used in a breeding programme, an assessment of a large number of wheat species was carried out. The evaluation was based on the estimation of a drought susceptibility index and stability in total dry matter and grain yields of various species grown across a range of soil moisture conditions. On the basis of stability in total dry matter yield, T. aestivum was relatively more drought resistant. However, on the basis of grain yield stability, T. sphaerococcum, T. vavilovii and T. aestivum cv. C 306 exhibited better yield stability and drought resistance than the other species tested. It is suggested that the above species could be utilized as parental material in a hybridisation programme aimed at improving the drought resistance of wheat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041738
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Assessment of drought resistance in 20 accessions of Triticum aestivum L. and related species II. Stability in yield components (1991)
    Springer
    Euphytica 56 (1991), S. 15-26 
    Details
    ISSN: 1573-5060
    Keywords: Triticum ; drought resistance ; stability in yield components
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Stability in yield components was estimated in several species of Triticum grown across a range of soil moisture. The aim was to assess the effect of varying soil moisture on mechanisms leading to grain yield stability, particularly in the accessions identified as having stable yields and drought resistance viz., T. sphaerococcum, T. vavilovii and T. aestivum cv. C 306 (Paper I of this series). The study indicated that number of grains per spike provided stability to the accessions of T. sphaerococcum and T. vavilovii whereas number of spikes per unit area contributed towards the stability of T. aestivum cv. C 306. It is suggested that these accessions could be utilized as the genetic sources for improving specific yield components with regard to grain yield stability under droughted conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041739
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A small-angle neutron scattering (SANS) study of worm-like micelles under shear (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 1169-1178 
    Details
    ISSN: 1572-9567
    Keywords: anisotropy ; Couette flow ; living polymers ; polydispersity ; rods ; shear alignment ; small-angle neutron scattering ; worm-like micelles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The structure of a cationic worm-like cylindrical micelle was investigated by SANS (small-angle neutron scattering). Intensities from 0.1% by weight solutions in D2O, at rest and under shear, were measured on the NIST Cold Neutron Research facility 30-m spectrometer in the wave vector range 0.03⩽Q (nm1)⩽-2.0. Scattered intensity patterns from the solutions subjected to shears equal to or greater than 40s1 showed pronounced anisotropy, but such anisotropy could not be detected below this apparent threshold shear. The threshold was characterized by a relaxation time since anisotropy was detected only after several minutes of shearing. In contrast, the anisotropy was apparent immediately the shear was applied at the higher shears. The data were analyzed based on the assumption that the micelles behave as rigid rods. Estimates of the radii and length under shear are given. Polydispersity in rod length is discussed, and we argue that it contributes significantly to the scattering patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01458825
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    Paper (German National Licenses)
    Fulltext
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