Articles by Keyword: Heritability

Search results for Heritability

We found 28 results for you
  1. Genetic Improvement of Timber Yield and Wood Quality in <em>Eucalyptus Grandis</em> (Hill) Maiden

    Item type: Journal Article • Journal: South African Forestry Journal
    Results of a partial diallel progeny test of Eucalyptus grandis assessed at ages 5, 36, 60 and 105 months are presented. Large genetic variations among full-sib families were found for all traits studied, e.g. the mean tree volume per family...
  2. An evaluation of two collections of South African maize (<em>Zea mays L.</em>) germ plasm: 1. The genetic basis of the synchronization of pollen shedding and silk emergence

    An evaluation of two collections of South African maize (<em>Zea mays L.</em>) germ plasm: 1. The genetic basis of the synchronization of pollen shedding and silk emergence

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Pollen shed-silking synchronization for a cultivar was measured by the interval between the dates on which 50% of the plants exhibited anthers and the dates on which 50% of the primary ears exhibited extruded silks. Under drought stress silking may...
  3. An evaluation of two collections of South African maize (<em>Zea mays L</em>.) germ plasm: 2. The genetic basis of dry-down rate

    An evaluation of two collections of South African maize (<em>Zea mays L</em>.) germ plasm: 2. The genetic basis of dry-down rate

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Dry-down rate is the loss of moisture from maize kernels over time. This study was undertaken to determine whether collections of early and late flowering South African germ plasm have the same genetic properties with reference to dry-down rate as...
  4. Phenotypic diversity for morphological and agronomic traits in traditional Ethiopian highland maize accessions

    Phenotypic diversity for morphological and agronomic traits in traditional Ethiopian highland maize accessions

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Farmers in the highlands of Ethiopia have developed locally adapted maize varieties for more than 300 years. In order to assess the phenotypic diversity among traditional Ethiopian highland maize accessions, a total of 180 accessions were evaluated for agro-morphological traits...
  5. Optimum replications and crop-years for sugarcane genotype trials at Dwangwa Sugar Estate in Malawi

    Optimum replications and crop-years for sugarcane genotype trials at Dwangwa Sugar Estate in Malawi

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The ability to detect significant differences among genotypes in trials depends on the variance associated with the means. Dwangwa Sugar Estate, Malawi, imports genotypes from the South African Sugarcane Research Institute (SASRI) to test for possible commercial release. The objective...
  6. Family selection gains for quality traits among South African sugarcane breeding populations

    Family selection gains for quality traits among South African sugarcane breeding populations

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    In sugarcane breeding, family selection has been shown to produce larger gains than individual plant selection. During family selection, whole families of seedlings are selected or rejected based on data derived from replicated family plots. The objective of this study...
  7. An investigation into the occurrence and nature of genotype by environment interaction in <em>Pinus patula</em>

    An investigation into the occurrence and nature of genotype by environment interaction in <em>Pinus patula</em>

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    This study was conducted as part of a joint venture between the tree improvement teams of Safcol and the CSIR to develop a breeding, production and conservation strategy for Pinus patula.
  8. Predicted and realized genetic gain in <em>Eucalyptus grandis</em> breeding seedling orchard in Zimbabwe

    Predicted and realized genetic gain in <em>Eucalyptus grandis</em> breeding seedling orchard in Zimbabwe

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    Results are presented of a fourth generation breeding seedling orchard of Eucalyptus grandis Hill Maiden of 30 half-sib families. Measurements at one and half and five years were available. Analysis of one and half year data showed no significant differences...
  9. Susceptibility of <em>Corymbia</em> species and hybrids to arthropod herbivory inAustralian subtropical hardwood plantations

    Susceptibility of <em>Corymbia</em> species and hybrids to arthropod herbivory inAustralian subtropical hardwood plantations

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Corymbia hybrids are becoming significant plantation varieties in subtropical and tropical Australian plantation forestry. Although primarily developed for disease resistance and amenability to clonal propagation, they have also proven to have good growth rates and site plasticity. Here we examined...
  10. Growth potential and genetic parameters of four Mesoamerican pines planted in the Southern Hemisphere

    Growth potential and genetic parameters of four Mesoamerican pines planted in the Southern Hemisphere

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Summary results are reported from a total of 319 provenance/progeny tests of Pinus tecunumanii, P. maximinoi, P. patula and P. greggii that were established on sites in Brazil, Colombia and South Africa. Tests were measured for the growth traits height,...