Articles by Keyword: Hybrid Breeding Strategies

Search results for Hybrid Breeding Strategies

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  1. Realised genetic gains and estimated genetic parameters of two <em>Eucalyptus grandis</em> × <em>E. urophylla</em> hybrid breeding strategies

    Realised genetic gains and estimated genetic parameters of two <em>Eucalyptus grandis</em> × <em>E. urophylla</em> hybrid breeding strategies

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Conventionally, Eucalyptus grandis × E. urophylla (GU) hybrid material is first tested as seedlings in progeny trials for at least four years before ortets are selected and ramets of the selected ortets are propagated to test in clonal trials. The...
  2. Program for the deterministic modelling of genetic gains of tree breeding and seed and clone production strategies

    Program for the deterministic modelling of genetic gains of tree breeding and seed and clone production strategies

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    A deterministic modelling algorithm was developed for the prediction of genetic gains of six breeding and 11 (seed and clone) production strategies. This algorithm can run iteratively over ranges of parameters which affect the genetic gains. These parameters are the...
  3. Genetic diversity of maize germplasm lines and implications for breeding <em>Maize streak virus</em> resistant hybrids

    Genetic diversity of maize germplasm lines and implications for breeding <em>Maize streak virus</em> resistant hybrids

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Evaluation of genetic distances between maize inbred lines can be used to maximise heterosis in hybrids. This study was conducted to determine genetic distances among 25 maize inbred lines in the Maize streak virus disease (MSVD) QTL region to develop...
  4. Breeding polyploid varieties of tropical acacias: progress and prospects

    Breeding polyploid varieties of tropical acacias: progress and prospects

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    The paper reviews a decade of progress with breeding new polyploid varieties of Acacia mangium and other tropical acacias in Vietnam, and outlines plans for future strategies to complement conventional diploid breeding. Polyploid breeding is a means of introducing diversity...
  5. 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...
  6. Selecting for palatability in <em>festuca arundinacea</em> schreb

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Plants of numerous Festuca arundinacea cultivars and strains were evaluated for palatability, using two methods; a relative softness of leaf technique and a grazing technique. The softness of leaf technique, as measured by hand, provided a useful method to distinguish...
  7. Yield assessment of advanced wheat breeding lines the Winter Rainfall Region of South Africa. I. Homogeneity of the region

    Yield assessment of advanced wheat breeding lines the Winter Rainfall Region of South Africa. I. Homogeneity of the region

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The major wheat-producing areas in the Winter Rainfall Region are geographically divided into the Rûens and Swartland. The question whether the Rûens and Swartland should be regarded as non-similar areas, each meriting its own wheat-breeding programme, is considered. Correlations between...
  8. Yield assessment of advanced wheat breeding lines in the Winter Rainfall Region of South Africa. II. Choosing representative trial sites

    Yield assessment of advanced wheat breeding lines in the Winter Rainfall Region of South Africa. II. Choosing representative trial sites

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    An evaluation of the present system of testing of advanced wheat lines was made in terms of expected genetic gain from selection. Indications are that this system can function quite effectively if properly managed. The feasibility of substituting high potential...
  9. Invloed van genotipe en humiditeit op kunsmatige bestuiwing by sojabone

    Invloed van genotipe en humiditeit op kunsmatige bestuiwing by sojabone

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die invloed van ouerkombinasie, tyd van bestuiwing en relatiewe humiditeit op kunsmatige bestuiwing by sojabone is ondersoek. Die persentasie sukses hou verband met die ouerkombinasie. Die beste tyd vir die maak van kunsmatige bestuiwings is klaarblyklik na 07h00. Die vroulike...
  10. Release of cotton breeding lines (<em>Gossypium hirsutum</em> L.) adapted to South African conditions

    Release of cotton breeding lines (<em>Gossypium hirsutum</em> L.) adapted to South African conditions

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The cotton breeding programme of the Tobacco and Cotton Research Institute has made available a number of advanced breeding lines and cultivars of cotton for a second cycle of intercrossing and selection. Selati, Gariep and NIK3 have been released for...