Articles by Keyword: Genotype By Environment Interaction

Search results for Genotype By Environment Interaction

We found 125 results for you
  1. The Role of Genotype-Environment Interaction in Adaptability

    Item type: Journal Article • Journal: South African Forestry Journal
    The over sites ratio of clonal (familial) genotype-environment interaction (GEI) variance to mean trial variance determines the regression that is used to predict adaptability. Genotypic and environmental variances do not contribute significantly to this regression. Genotype x environment interaction effects...
  2. Pine Provenance Research in South Africa: Promises and Problems

    Item type: Journal Article • Journal: South African Forestry Journal
    Provenance research really started with the work of H.L. Duhamel Du Monceau on Pinus sylvestris in the eighteenth century. In South Africa the first properly designed provenance trials were established between 1934 and 1936 with the testing of five races...
  3. The Genetic Control of Ring Width, Wood Density and Tracheid Length in the Juvenile Core of <em>Pinus patula</em>

    Item type: Journal Article • Journal: South African Forestry Journal
    Controlled crosses were made between six Pinus patula Schiede & Deppe plus trees selected in plantations. Six full-sib families and two commercial checks were planted in randomised complete block thrice-replicated progeny tests at two sites in Zimbabwe. At 7,5 years,...
  4. The nature of genotype × environment interactions for yield in wheat extension trials in the Winter Rainfall Region

    The nature of genotype × environment interactions for yield in wheat extension trials in the Winter Rainfall Region

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The necessity to subdivide the wheat producing soils of the Winter Rainfall Region for extension purposes, was considered. Use was made of correlations, interaction variance components and pattern analysis procedures to reflect on the possible existence of sub-environments with different...
  5. Genotipe × omgewingsinteraksie by winterkoring in die Oranje-Vrystaat

    Genotipe × omgewingsinteraksie by winterkoring in die Oranje-Vrystaat

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Gesamentlike variansieanalises is uitgevoer op opbrengs, hektolitermassa en proteïeninhoud data verkry uit koring-evaluasieproewe wat in die Oranje-Vrystaat gedoen is. Die gebalanseerde datastelle het sewe winterkoringgenotipes, ingesluit wat op elk van 14 lokaliteite oor 'n periode van drie jaar geplant was...
  6. Comparison of cotton (<em>Gossypium hirsutum</em> L.) yield and fibre properties over locations and seasons

    Comparison of cotton (<em>Gossypium hirsutum</em> L.) yield and fibre properties over locations and seasons

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The cotton breeding program in the Republic of South Africa is conducted at the localities Loskop, Upington and Vaalharts. Preliminary results from breeding trials indicated that a finer but more mature fibre could be produced at Vaalharts as compared to...
  7. The success of the AMMI model in predicting lucerne yields for cultivars with differing dormancy characteristics

    The success of the AMMI model in predicting lucerne yields for cultivars with differing dormancy characteristics

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The AMMI model, which incorporates both additive and multiplicative components into an integrated, powerful, least squares analysis, is used for the analysis of cultivar trials at different localities. These trials are a major experimental component in crop production and plant...
  8. AMMI analysis of potato cultivar yield trials

    AMMI analysis of potato cultivar yield trials

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Potatoes, Solanum tuberosum (L), are cultivated in South Africa under a variety of different climates and seasons. The wide environmental variation encountered and the confirmed occurrence of genotype-environmental interaction necessitates the use of criteria, other than averages, in the evaluation...
  9. Multivariate assessment of environmental effects on hard red winter wheat. I. Principal-components analysis of yield and bread-making characteristics

    Multivariate assessment of environmental effects on hard red winter wheat. I. Principal-components analysis of yield and bread-making characteristics

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The attributes of yield and bread-making quality of winter wheats produced in the Free State are subject to environmental effects. The result is a supply to the baking industry of flour of inconsistent quality, which in turn is detrimental to...
  10. Multivariate assessment of environmental effects on hard red winter wheat. II. Canonical correlation and canonical variate analysis of yield, biochemical and bread-making characteristics

    Multivariate assessment of environmental effects on hard red winter wheat. II. Canonical correlation and canonical variate analysis of yield, biochemical and bread-making characteristics

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The inconsistent production of winter wheat with acceptable bread-making quality in the Free State reduces the commercial value of the wheat crop. In the second part of this study, canonical correlation analysis was used to determine to what extent variation...