A Major Quantitative Trait Locus Controlling Cadmium Translocation in Rice (Oryza sativa)

The trait of low cadmium (Cd) accumulation in brown rice (Oryza sativa) is important for food safety. An effective way to reduce Cd accumulation in the grain is to control Cd transfer from the roots to the shoots. Here, we investigated genotypic variation in the shoot Cd concentration among 146 acce...

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Bibliographic Details
Published in:The New phytologist 2009-05, Vol.182 (3), p.644-653
Main Authors: Ueno, D., Kono, I., Yokosho, K., Ando, T., Yano, M., Ma, J. F.
Format: Article
Language:English
Subjects:
Biological Transport
Cadmium
cadmium (Cd) accumulation
Cadmium - metabolism
Chromosomes
Chromosomes, Plant - genetics
Genetic Variation
Genotype
genotypic variation
Grains
Nutrient solutions
Oryza - genetics
Oryza sativa
Plant Roots - growth & development
Plant Roots - metabolism
Plant Shoots - growth & development
Plant Shoots - metabolism
Plants
Quantitative trait loci
Quantitative Trait Loci - genetics
quantitative trait locus (QTL)
Reproducibility of Results
Rice
rice (Oryza sativa)
Seedlings
Soil pollution
Time Factors
translocation
Xylem
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Summary:The trait of low cadmium (Cd) accumulation in brown rice (Oryza sativa) is important for food safety. An effective way to reduce Cd accumulation in the grain is to control Cd transfer from the roots to the shoots. Here, we investigated genotypic variation in the shoot Cd concentration among 146 accessions from a rice core collection and performed a quantitative trait locus (QTL) analysis to determine the loci controlling shoot Cd accumulation. Furthermore, we physiologically characterized the two accessions used for QTL analysis. Large genotypic variation (13-fold) in the shoot Cd concentration was found. A major QTL was detected on chromosome 11 using a Fâ‚‚ population derived from Badari Dhan (a high-Cd accession) and Shwe War (a low-Cd accession). This QTL explained 16.1 % of the phenotypic variation in Cd accumulation. Furthermore, this QTL was confirmed by analysis of advanced progeny. Physiological studies showed that Badari Dhan and Shwe War did not differ in uptake of Cd by the roots, but differed greatly in the translocation of Cd from the roots to the shoots. Taken together, our findings suggest that the major QTL detected is responsible for the translocation of Cd from the roots to the shoots.
ISSN:0028-646X
1469-8137
DOI:10.1111/j.1469-8137.2009.02784.x