A major quantitative trait locus for increasing cadmium-specific concentration in rice grain is located on the short arm of chromosome 7

Satoru Ishikawa, Tadashi Abe, Masato Kuramata, Masayuki Yamaguchi, Tsuyu Ando, Toshio Yamamoto, Masahiro Yano

Research output: Contribution to journalArticle

90 Citations (Scopus)

Abstract

Large phenotypic variations in the cadmium (Cd) concentration of rice grains and shoots have been observed. However, the genetic control of Cd accumulation remains poorly understood. Quantitative trait loci (QTLs) determining the grain Cd concentration of rice grown in a Cd-polluted paddy field were identified. Using a mapping population consisting of 85 backcross inbred lines derived from a cross between the low-Cd-accumulating cultivar Sasanishiki (japonica) and high-Cd-accumulating cultivar Habataki (indica), two QTLs for increasing grain Cd concentration were found on chromosomes 2 and 7. A major-effect QTL, qGCd7 (QTL for grain Cd on chromosome 7), was detected on the short arm of chromosome 7. It accounted for 35.5% of all phenotypic variance in backcross inbred lines. qGCd7 was not genetically related to any QTLs for concentrations of essential trace metals (Cu, Fe, Mn, and Zn) or those for agronomic traits such as heading date, suggesting that this QTL is specific to Cd. Furthermore, the existence of qGCd7 was confirmed using chromosome segment substitution lines (CSSLs) and an F2 population from a cross between the target CSSL and Sasanishiki grown in a Cd-polluted paddy soil. To our knowledge, qGCd7 is a novel QTL with major effects for increasing grain Cd concentrations.

Original languageEnglish
Pages (from-to)923-934
Number of pages12
JournalJournal of experimental botany
Volume61
Issue number3
DOIs
Publication statusPublished - Mar 1 2010
Externally publishedYes

Keywords

  • Advanced mapping population
  • Cadmium
  • Essential trace metals
  • Oryza sativa L.
  • Quantitative trait loci

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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