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- Title
A major quantitative trait locus for increasing cadmium-specific concentration in rice grain is located on the short arm of chromosome 7.
- Authors
Ishikawa, Satoru; Abe, Tadashi; Kuramata, Masato; Yamaguchi, Masayuki; Ando, Tsuyu; Yamamoto, Toshio; Yano, Masahiro
- 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.
- Subjects
RICE; GRAIN; PLANT chromosomes; EFFECT of cadmium on plants; PHYSIOLOGICAL effects of cadmium; PLANT genetics
- Publication
Journal of Experimental Botany, 2010, Vol 61, Issue 3, p923
- ISSN
0022-0957
- Publication type
Article
- DOI
10.1093/jxb/erp360