Rice-arsenate interactions in hydroponics: a three-gene model for tolerance

Gareth J. Norton*, Meher Nigar, Paul N. Williams, Tapash Dasgupta, Andrew A. Meharg, Adam H. Price

*Corresponding author for this work

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

In this study, the genetic mapping of the tolerance of root growth to 13.3 muM arsenate [As(V)] using the BalaxAzucena population is improved, and candidate genes for further study are identified. A remarkable three-gene model of tolerance is advanced, which appears to involve epistatic interaction between three major genes, two on chromosome 6 and one on chromosome 10. Any combination of two of these genes inherited from the tolerant parent leads to the plant having tolerance. Lists of potential positional candidate genes are presented. These are then refined using whole genome transcriptomics data and bioinformatics. Physiological evidence is also provided that genes related to phosphate transport are unlikely to be behind the genetic loci conferring tolerance. These results offer testable hypotheses for genes related to As(V) tolerance that might offer strategies for mitigating arsenic (As) accumulation in consumed rice.
Original languageEnglish
Pages (from-to)2277-84
Number of pages8
JournalJournal of experimental botany
Volume59
Issue number8
DOIs
Publication statusPublished - May 2008

Keywords

  • arsenate tolerance
  • Oryza sativa
  • HOLCUS-LANATUS
  • POLYMORPHISM
  • MAP
  • GENE
  • candidate genes
  • ROOTS
  • ORYZA-SATIVA
  • PHYTOCHELATIN COMPLEXES
  • ARSENITE
  • METABOLISM
  • epistatic interactions

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