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Quantitative phenotypical expression of three mutant genes in barley and the basis for defining an ideotype for Mediterranean environments (1990)

Molina-Cano, J. L. ; Moral, L. F. García ; Ramos, J. M. ; [et al.]

Springer

Theoretical and applied genetics 80 (1990), S. 762-768

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ISSN: 1432-2242

Keywords: Barley genetics ; Quantitative gene expression ; Ideotype ; Mutants

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Three mutants induced in the two-rowed barley variety Beka and their three binary recombinants have been used in an attempt to define an ideotype suitable for Mediterranean agroclimatic conditions. Physiological methods (classical plant growth analysis) together with the study of genotype x environment interaction for grain yield were used to characterize the genotypes. That characterization brought out the huge phenotypical variation produced by only three mutant genes, suggesting that single Mendelian genes may alone explain the quantitative variation, including grain yield, without the necessity of using the polygenic concept. The genotype best adapted to the environments studied is later in heading and has shorter straw and denser spikes than Beka; it also has higher inverse of leaf area rate and grain: leaf area ratio, a lower rate of leaf senescence, and a shorter grain filling period than the original variety.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00224189

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Finite element methods for one-dimensional combustion problems (1990)

Ramos, J. I.

Chichester : Wiley-Blackwell

International Journal for Numerical Methods in Fluids 11 (1990), S. 893-906

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ISSN: 0271-2091

Keywords: Adaptive ; Characteristic ; Flux-corrected Transport ; Petrov-Galerkin ; Finite Elements ; Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Three adaptive finite element methods based on equidistribution, elliptic grid generation and hybrid techniques are used to study a system of reaction-diffusion equations. It is shown that these techniques must employ sub-equidistributing meshes in order to avoid ill-conditioned matrices and ensure the convergence of the Newton method. It is also shown that elliptic grid generation methods require much longer computer times than hybrid and static rezoning procedures. The paper also includes characteristic, Petrov-Galerkin and flux-corrected transport algorithms which are used to study a linear convection-reaction-diffusion equation that has an analytical solution. The flux-corrected transport technique yields monotonic solutions in good agreement with the analytical solution, whereas the Petrov-Galerkin method with quadratic upstream-weighted functions results in very diffused temperature profiles. The characteristic finite element method which uses a Lagrangian-Eulerian formulation overpredicts the flame front location and exhibits overshoots and undershoots near the temperature discontinuity. These overshoots and undershoots are due to the interpolation of the results of the Lagrangian operator onto the fixed Eulerian grid used to solve the reaction-diffusion operator, and indicate that characteristic finite element methods are not able to eliminate numerical diffusion entirely.

Additional Material: 7 Ill.