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  1. No Access

    Chapter

    Gene Family Evolution in Allium Species

    During evolution, plant genomes have undergone duplications, deletions and rearrangements resulting in a wide variation in genome size and number of gene family members between different species. The variation...

    Jiffinvir Khosa, Robyn Lee, John McCallum, Richard Macknight in The Allium Genomes (2018)

  2. No Access

    Chapter

    Molecular Map** of Genes and QTL: Progress to Date and Development of New Population Resources for NGS Genetics

    Ability to conduct molecular analyses in Allium species was previously limited by the power of available technologies to sample very large heterozygous genomes in a cost-effective manner. The emergence of third-g...

    John McCallum, Samantha Baldwin, Richard Macknight, Jiffinvir Khosa… in The Allium Genomes (2018)

  3. No Access

    Article

    Genetic analyses of bolting in bulb onion (Allium cepa L.)

    We present the first evidence for a QTL conditioning an adaptive trait in bulb onion, and the first linkage and population genetics analyses of candidate genes involved in photoperiod and verna...

    Samantha Baldwin, Roopashree Revanna… in Theoretical and Applied Genetics (2014)

  4. No Access

    Article

    Genetic map** of sulfur assimilation genes reveals a QTL for onion bulb pungency

    Onion exhibits wide genetic and environmental variation in bioactive organosulfur compounds that impart pungency and health benefits. A PCR-based molecular marker map that included candidate genes for sulfur a...

    John McCallum, Meeghan Pither-Joyce, Martin Shaw… in Theoretical and Applied Genetics (2007)

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    Chapter

    Onion

    John McCallum in Vegetables (2007)

  6. No Access

    Article

    Genetic map** of a major gene affecting onion bulb fructan content

    The non-structural dry matter content of onion bulbs consists principally of fructose, glucose, sucrose and fructans. The objective of this study was to understand the genetic basis for the wide variation obse...

    John McCallum, Andrew Clarke, Meeghan Pither-Joyce… in Theoretical and Applied Genetics (2006)

  7. No Access

    Article

    Sulfur and nitrogen fertility affects flavour of field-grown onions

    Although glasshouse studies have conclusively demonstrated that S nutrition can affect onion (Allium cepaL.) pungency this has been rarely observed in field-based studies due to difficulties in controlling S nutr...

    John McCallum, Noel Porter, Bruce Searle, Martin Shaw, Bodhi Bettjeman… in Plant and Soil (2005)