Abstract：
Rice (Oryza sativa) is an important nutritional grain for the majority of Asian countries, but it is also a major source of cadmium (Cd) accumulation. A pot experiment was carried out to investigate the Cd uptake and translocation of high Cd (IR-50) and low Cd (White Ponni) rice cultivars in Cd-contaminated soils. The findings revealed that Cd impacts on rice development and growth differed depending on rice cultivars. Soil Cd levels in the seedling stage exceeded the critical levels (3-6 mg kg-1) only 5.0 mg kg-1 Cd treatment for the IR-50 (7.47 mg kg-1). At higher Cd treatments (1.0 and 5.0 mg kg-1), morphometric characteristics and yield of grains showed a declining and increasing trend in both rice varieties, respectively. The accumulation of Cd was higher in soil and roots during seedling and tillering stages, whereas in booting and maturity stages increased in stems and leaves in IR-50 and WP rice varieties. Cd levels in rice grains above the maximum allowable limit (0.4 mg kg-1) only in IR-50 (0.51 mg kg-1) rice cultivar at maturity stage. The EF of Cd were classified as minor enrichment to \'moderate enrichment\' in both rice cultivars. TF values exhibited > 1 in booting and maturity stages in both rice cultivars at higher Cd treatments. The study concluded that the IR-50 rice variety exhibited increased Cd intake and transported to various parts of rice plants, particularly grains. The findings indicate that WP rice cultivar is more resistant to Cd toxicity, reducing health hazards for persons who preferred the staple food rice.
摘要：
水稻（Oryzasativa）是大多数亚洲国家的重要营养谷物，但它也是镉（Cd）积累的主要来源。进行了盆栽试验，以研究高Cd（IR-50）和低Cd（WhitePonni）水稻品种在Cd污染土壤中的Cd吸收和转运。研究结果表明，Cd对水稻发育和生长的影响因水稻品种而异。对于IR-50（7.47mgkg-1），苗期土壤Cd水平仅超过5.0mgkg-1Cd处理的临界水平（3-6mgkg-1）。在较高的Cd处理（1.0和5.0mgkg-1）下，两个水稻品种的形态特征和籽粒产量均呈下降和上升趋势，分别。在苗期和分耕期，土壤和根系中Cd的积累较高。而在孕穗期和成熟期，IR-50和WP水稻品种的茎和叶增加。只有在成熟期的IR-50（0.51mgkg-1）水稻品种中，水稻籽粒中的Cd水平才高于最大允许限值（0.4mgkg-1）。在两个水稻品种中，Cd的EF均被分类为少量富集到“中度富集”。在较高的Cd处理下，两个水稻品种的孕穗期和成熟期的TF值都>1。研究结果表明，IR-50水稻品种表现出增加的Cd摄入量，并运输到水稻的各个部分，特别是谷物。结果表明，WP水稻品种对Cd毒性的抗性更强，减少主食米饭对人的健康危害。
