Genetic and physiological characteristics of high-Cd accumulating rice cultivars

石川 覚*; 安部 匡*; 倉俣 正人*; 井倉 将人*; 鈴井 伸郎; 伊藤 小百合*; 石井 里美; 河地 有木; 藤巻 秀; 山本 敏央*; et al.

no journal, , 

We found three indica rice cultivars (Choko-koku, Jarjan, Anjana Dhan) with markedly high Cd concentrations in their grains and shoots from the world rice core collection (WRC), consisting of 69 rice accessions which covers the genetic diversity of almost 32,000 accessions of cultivated rice. To characterize the differences in Cd dynamics between the high- and low-Cd accumulating rice cultivars, we used positron-emitting 107Cd tracer and an innovative imaging technique, the positron-emitting tracer imaging system (PETIS). The apparent differences were clearly shown as Cd retention in the roots, the rates of Cd translocation from the roots to the shoots, and the long-distance Cd transport to the panicles. To identify the gene loci for Cd accumulation in rice, we conducted the QTL genetic analysis and found the major QTL gene (qCdp7) for increasing Cd accumulation. This gene derived from the high-Cd accumulating cultivars would be useful for developing practical rice cultivars for Cd-phytoextraction use.