Phosphorus deficiency-induced root elongation and its QTL in rice (Oryza sativa L.)

Theor Appl Genet. 2004 Nov;109(7):1361-8. doi: 10.1007/s00122-004-1751-4. Epub 2004 Sep 16.


A significant level of root elongation was induced in rice (Oryza sativa) grown under phosphorus-deficient conditions. The root elongation clearly varied among a total of 62 varieties screened under two different phosphorus levels. Two contrasting varieties, 'Gimbozu', with a low elongating response and 'Kasalath', with a high elongating response, were chosen and crossed to produce a hybrid population for QTL analyses. QTLs for the phosphorus deficiency-induced root elongation were detected by two linkage maps, i.e., one with 82 F3 families constructed by 97 simple sequence repeat (SSR) and sequence-tag site markers and another with 97 F8 lines by 790 amplified fragment length polymorphism and SSR markers. A single QTL for the elongation response was detected on chromosome 6, with a LOD score of 4.5 in both maps and explained about 20% of total phenotypic variance. In addition, this QTL itself, or a region tightly linked with it, partly explained an ability to reduce accumulation of excess iron in the shoots. The identified QTL will be useful to improve rice varieties against a complex nutritional disorder caused by phosphorus deficiency and iron toxicity.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Oryza / genetics*
  • Phosphorus / deficiency*
  • Plant Roots / genetics
  • Plant Roots / growth & development*
  • Quantitative Trait Loci*
  • Reproducibility of Results
  • Seedlings / genetics
  • Seedlings / growth & development
  • Species Specificity


  • Phosphorus