Selection of rice cultivars having low-grain cadmium in cadmium-polluted paddy fields in Thailand

从泰国Tak省梅索区Pha Te村的所有23户家庭收集家庭消费的稻米。 这一地区受到来自锌矿的镉污染。 糙米中Cd含量的测定结果表明，糙米中Cd含量高于糙米。稻米镉含量在0.04 ~ 1.75mg·kg-1之间，半数以上农户的稻米镉含量超过CODEX标准的临界值（0.4mg·kg-1）。 为了减少村民的健康风险，我们开始选择水稻品种具有较低的粮食镉比流行品种Khao Dawk马里（KDM）105。 在42个泰国水稻品种中，RD 5、RD 15和Sang Yod籽粒中Cd积累量低于KDM 105。 研究结果表明，通过选择低镉水稻品种可以减少人类镉摄入量，并于2013年5月通过当地非政府组织向村民宣布了这一有希望的结果。

Home-consumed rice grains were collected from all 23 households in the village of Pha Te, Mae Sot District of Tak Province, Thailand. This area has been polluted with Cd from a zinc mine. The Cd concentration in unhusked rice (Oryza sativa L.) grains ranged from 0.04 to 1.75mg Cd kg-1, and the rice of more than half of the households contained Cd levels higher than the critical level of 0.4 mg Cd kg-1 polished rice, which is the CODEX standard. To reduce the health risk of the villagers, we started to select rice cultivars having lower grain Cd than that of a prevailing cultivar Khao Dawk Mali (KDM) 105. Among 42 cultivars of Thai rice (Oryza sativa L.), lower levels of Cd accumulated in the grains of RD5, RD15, and Sang Yod than KDM105. The findings suggest that human cadmium intake can be reduced by selecting low-Cd rice cultivars, and the promising result was announced to the villagers at May 2013 through a local NGO group.