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  • Puccinia striiformis  (2)
  • diverging-converging capillary RUC  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Resistance to stripe rust in Triticum turgidum, T. tauschii and their synthetic hexaploids (1995)
    Springer
    Euphytica 82 (1995), S. 117-124 
    Details
    ISSN: 1573-5060
    Keywords: Triticum turgidum ; wheat ; Triticum tauschii ; synthetic hexaploid ; Puccinia striiformis ; stripe rust ; rust resistance ; yellow rust ; Aegilops squarrosa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Resistance to stripe rust (caused by Puccinia striiformis Westend.) of 34 Triticum turgidum L. var.durum, 278 T. tauschii, and 267 synthetic hexaploid wheats (T. turgidum x T. tauschii) was evaluated at the seedling stage in the greenhouse and at the adult-plant stage at two field locations. Mexican pathotype 14E14 was used in all studies. Seedling resistance, expressed as low infection type, was present in all three species. One hundred and twenty-eight (46%) accessions of T. tauschii, 8 (23%) of T. turgidum and 31 (12%) of synthetic hexaploid wheats were highly resistant as seedlings. In the field tests, resistance was evaluated by estimating area under disease progress curve (AUDPC). Synthetic hexaploid wheats showed a wide range of variability for disease responses in both greenhouse and field tests, indicating the presence of a number of genes for resistance. In general, genotypes with seedling resistance were also found to be resistant as adult plants. Genotypes, which were susceptible or intermediate as seedlings but resistant as adult plants, were present in both T. turgidum and the synthetic hexaploids. Resistances from either T. turgidum or T. tauschii or both were identified in the synthetic hexaploids in this study. These new sources of resistance could be incorporated into cultivated hexaploid wheats to increase the existing gene pool of resistance to stripe rust.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027057
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  • 2
    Electronic Resource
    Electronic Resource
    Resistance to stripe rust in durum wheats, A-genome diploids, and their amphiploids (1997)
    Springer
    Euphytica 94 (1997), S. 279-286 
    Details
    ISSN: 1573-5060
    Keywords: Triticum turgidum ; T. monococcum ; T. boeoticum ; T. urartu ; wheat ; Puccinia striiformis ; stripe rust ; rust resistance ; amphiploid ; suppressors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Stripe rust (caused by Puccinia striiformis Westend.) is a wheat disease of worldwide importance. Seedlings of 75 accessions of Triticum boeoticum, 12 of T. monococcum, 16 of T. urartu, 230 of durum wheat (T. turgidum L. var. durum), and 128 amphiploids (genome AAAABB) involving the crosses of the three diploid species (AA) with T. turgidum (AABB) were evaluated in the greenhouse for their reaction to P. striiformis race 14E14. Durum wheats and the amphiploids were also evaluated at two field locations in Mexico with the same race for their adult plant response. Resistant seedling reactions (infection types: 0-3 on a 0-9 scale) were seen for 10 (13%) accessions of T. boeticum, 19 (8%) accessions of T. turgidum and 32 (25%) amphiploids. The remaining accessions were either moderately resistant (ITs 4-6) or susceptible (ITs 7-9). The three amphiploids derived from the crosses of seedling resistant T. boeoticum and T. turgidum, were resistant as seedlings. Among the 51 amphiploids involving one resistant parent, 29 were resistant and the remaining 22 displayed intermediate to susceptible reactions. Suppressors for resistance were common in the A and AB genomes and suppression was resistance gene specific. Forty-five (20%) durums showed adequate field resistance (relative AUDPC 〈10% of the susceptible check ‘Morocco’). These included the 19 seedling resistant durums. Presence of genes involved in adult plant resistance was evident, because 26 of the remaining adult plant resistant durums had displayed intermediate-susceptible seedling reactions. Though the seedling reactions of the amphiploids varied from low to high, all involving the adult plant resistant durums possessed adequate field resistance. The resistant, newly produced, AAAABB amphiploids are useful genetic resources for stripe rust resistance which could be transferred to the cultivated T. turgidum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002979706378
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  • 3
    Electronic Resource
    Electronic Resource
    Numerical analysis of viscous, incompressible flow in a diverging-converging RUC (1993)
    Springer
    Transport in porous media 13 (1993), S. 161-177 
    Details
    ISSN: 1573-1634
    Keywords: Flow in porous media ; diverging-converging capillary RUC ; numerical computation ; vorticity-stream function equation ; corner singularity ; pressure computation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract To quantitatively analyze the macroscopic properties of the flow in porous media by means of the continuum approach, detailed information (velocity and pressure fields) on the microscopic scale is necessary. In this paper, the numerical solution for incompressible, Newtonian flow in a diverging-converging representative unit cell (RUC) is presented. A new solution procedure for the problem is introduced. A review of the accuracy of the computational method is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654408
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  • 4
    Electronic Resource
    Electronic Resource
    The microscopic analysis of high forchheimer number flow in porous media (1993)
    Springer
    Transport in porous media 13 (1993), S. 139-160 
    Details
    ISSN: 1573-1634
    Keywords: Flow in porous media ; non-Darcy flow ; inertial effects ; high Forchheimer number ; Forchheimer equation ; averaging theorem ; diverging-converging capillary RUC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract High Forchheimer number flow through a rigid porous medium is numerically analysed by means of the volumetric averaging concept. The microscopic flow mechanisms, which must be known in order to understand the macroscopic flow phenomena, are studied by utilising a periodic diverging-converging representative unit cell (RUC). The detailed information for the microscopic flow field, in association with the locally averaged momentum balance, makes it possible to quantitatively demonstrate that the microscopic inertial phenomenon, which leads to distorted velocity and pressure fields, is the fundamental reason for the onset of nonlinear (non-Darcy) effects as velocity increases. The hydrodynamic definitions for Darcy's law permeabilityk, the inertial coefficientΒ and Forchheimer number Fo are obtained by applying the averaging theorem to the pore level Navier-Stokes equations. Finally, these macroscopic parameters are numerically calculated at various combinations of micro-geometry and flow rate, and graphically correlated with the relevant microscopic parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654407
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