自然富硒土中Se对不同水稻籽粒吸收Cd的影响

通过水稻盆栽试验,在高低两种自然富硒土壤上种植3种水稻。结果发现,水稻籽粒Se含量与土壤中Se含量呈正相关,而土壤硒含量过高会降低水稻籽粒的产量。在添加Cd下,高富硒土种植的博优998、秋优998、金稻优998等水稻籽粒Cd含量比低富硒土分别降低了26.99%、10.28%、13.48%,说明土壤中适量的Se对水稻籽粒吸收Cd有拮抗作用。另外,秋优998富集Se、Cd的能力最强,生物产量最低,金稻优998达到富硒效果,而富集Cd的能力最弱,且生物产量较高,在筛选品种时,应优选金稻优998。

Effect of Se in the Natural Selenium-rich Soils on Absorption of Cd in Rice Grains

By pot rice experiments, 3 kinds of rice including Boyou 998, Qiuyou 998 and Jindaoyou 995 were planted in the natural Selenium-rich soils with high Se concentration and low Se concentration respectively. The results indicated that positive correlation was found between Se content in the rice grains and that in the soils. However, the yield of rice grains decreased when Se content in the soils was in a high level. After addition of Cd, the results showed that the content of Cd in the rice grains of Boyou 998, Qiuyou 998 and Jindaoyou 998 planted in the natural Se-rich soils in a high level was reduced by 26.99%, 10.28% and 13.48% respectively compared to those planted in the natural Se-rich soils in a low level, which indicated the antagonism of appropriate amount of Se in the soils towards Cd absorption. Moreover, Qiuyou 998 had the strongest enrichment of Se and Cd but with lowest yield. Jindaoyou 998 had a certain effect on Se collection but with lowest collection capacity of Cd. However, the output of Jindaoyou 998 was higher. Therefore, when varieties were screened, priority should be given to Jindaoyou 998.