不同水稻品种对As的富集及迁移

Accumulation and Migratory Aptitude of As in Rice Cultivars

为筛选出适合于当地种植的砷(As)低累积水稻品种,并研究水稻不同器官间As的富集迁移。在As严重污染农田上进行田间小区试验,研究了13个不同水稻品种对As的富集作用及其不同部位对As的累积迁移能力。结果表明:①所有水稻品种精米中As含量均低于国家绿色大米卫生标准中As含量(0.4 mg/kg)和无公害大米标准中As含量(0.5 mg/kg),其中南粳41精米中As含量较高(0.38 mg/kg),武粳15精米中As含量最低(0.10 mg/kg)。②不同水稻品种间产量差异较大,扬稻6号产量最高,宁粳3号产量最低;③13个水稻品种不同部位As含量均为:根>茎叶>谷壳>精米,As主要在根部累积;④在本试验条件下(土壤中As含量为72.2 mg/kg),综合考虑产量及对As的吸收累积和迁移能力,供试的13个水稻品种中武粳15、武育粳3号、南粳44以及武香粳14为相对As低累积水稻品种。

Field experiment was conducted to study the accumulation and migration of heavy metal element As in thirteen rice cultivars in order to select the lowly As-accumulated rice cuhivars. The As contents in the milled grains of all cultivars were less than those of the National Green Rice Standard （ 0.4 mg/kg） and Nuisanceless Rice Standard （ 0. 5 mg/kg）, the milled grains of Nanjing 41 accumulating the highest contents of As （0. 38 mg/kg） and Wujing 15 accumulating the lowest （0. 10 mg/kg）. Yields in rice varieties showed significant differences, Yangdao 6 and Ningjing 3 occupying the highest and lowest outputs. The accumulation of As in different organs of thirteen rice cultivars were showed as follows： root〉stem and leave〉chaff〉milled grain. The accumulations of As in Wujing 15, Wuyujing 3, Nanjing and Wuxiangjing 14 are relative lower in thirteen rice cuhivars, with yield and capability to absorb and transport As taken into account.