Abstract
Cadmium (Cd) accumulation in brown rice has been a threat for human health and agriculture. Controlling of Cd uptake in shoots may ultimately suppress Cd accumulation in brown rice. In the present study, to understand the mechanisms of Cd accumulation in rice, we first investigated Cd accumulation in the shoots in 148 accessions from rice core-collection. The results showed that there was a more than 10-fold difference in the shoot Cd concentration among accessions. We then generated two F2 populations for QTL analysis by crossing the high- and low-Cd accumulating accessions. One QTL were detected on chromosomes 11 in the population from Badari Dhan (high accumulation) and Shwe War (low accumulation), while two QTLs were detected on chromosome 7 and 10 in the population from Nepal 555 (high accumulation) and Shwe War. These results indicate that Cd accumulation in Badari Dhan and Nepal 555 is controlled by different genes.
