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

  title={Genetic mapping of sulfur assimilation genes reveals a QTL for onion bulb pungency},
  author={John McCallum and Meeghan D Pither-Joyce and Martin Shaw and Fernand Kenel and Sheree Davis and R. Butler and John Scheffer and Jernej Jak{\vs}e and Michael J Havey},
  journal={Theoretical and Applied Genetics},
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 assimilation was used to identify genomic regions affecting pungency in the cross 'W202A' × 'Texas Grano 438'. Linkage mapping revealed that genes encoding plastidic ferredoxin-sulfite reductase (SiR) and plastidic ATP sulfurylase (ATPS) are closely linked (1–2 cM) on chromosome 3. Inbred… CONTINUE READING
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