Articles by Author: John Derera

Search results for John Derera

We found 216 results for you
  1. 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...
  2. Combining Ability and Molecular Genetic Distances in Tropical Maize Lines for Grain Yield and Agronomic Traits

    Combining Ability and Molecular Genetic Distances in Tropical Maize Lines for Grain Yield and Agronomic Traits

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Ascertaining the relationship of genetic diversity and combining ability would aid the design of a breeding strategy for maize hybrids. Twelve tropical maize inbreds were crossed in a half-diallel to study gene action for yield and other traits and also...
  3. Assessment of genetic diversity of rice based on SNP markers for selection of parents for sheath rot (<em>Sarocladium oryzae</em>) resistance breeding

    Assessment of genetic diversity of rice based on SNP markers for selection of parents for sheath rot (<em>Sarocladium oryzae</em>) resistance breeding

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Sheath rot of rice, caused by Sarocladium oryzae, is an important emerging rice disease not only in Rwanda, but also in other rice-growing countries. Given that cultivar resistance is a sustainable management strategy for small-scale farmers, the aim of this...
  4. The Use of Roots to Test N, P and K Deficiencies in <em>Eucalyptus</em> Nutrition

    Item type: Journal Article • Journal: South African Forestry Journal
    Bioassays have been developed which can provide diagnostics of the nutritional status of trees. They measure the flux of N, P or Rb for K into roots from standard solutions where the rate of influx is inversely related to nutrient...
  5. Postflexion and transforming larvae of <em>Gonorynchus gonorynchus</em> (Linnaeus, 1766)

    Postflexion and transforming larvae of <em>Gonorynchus gonorynchus</em> (Linnaeus, 1766)

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Postflexion larvae of Gonorynchus gonorynchus, previously undocumented, are described from the South-East Atlantic. Comparisons with descriptions of larval G. abbreviatus and larvae of another, still unidentified, species of Gonorynchus suggest slight to conspicuous differences in pigmentation between species.
  6. Development of a doubled haploid mapping population and linkage map for the bread wheat cross Kariega × Avocet S

    Development of a doubled haploid mapping population and linkage map for the bread wheat cross Kariega × Avocet S

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A doubled haploid wheat population of 150 lines was constructed from the F1 of a cross between cultivars Kariega and Avocet S using the wheat-maize technique. Segregation and linkage analysis of 203 DNA markers, two storage protein markers and the...