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通过盆栽试验分析硒高、低累积型水稻植株硒的吸收和分配规律、糙米中有机硒的累积特点及土壤有效硒的变化。结果表明:两个水稻品种各部分硒的分配规律完全一致,均为根>茎叶>糙米>稻壳。水稻各部分的含硒量及糙米有机硒的含量均随土壤施硒水平增加而升高,且高累积水稻的含硒量显著高于低累积水稻(P<0.05),在0、0.5、1.0和5.0 mg kg-1施硒水平下,前者分别为后者的6.7、1.9、2.1和1.6倍。糙米中有机硒的比例为64.7%~74.4%,不过,高、低累积型水稻糙米有机硒占全硒的比例之间并无显著性差异(P>0.05)。土壤总硒及有效硒的含量随施硒量的增加也表现出逐步升高的趋势,但高、低累积型水稻土壤有效硒的比例均在5.5%~7.4%范围内,且两者之间无明显差异(P>0.05)。除水稻基因型外,土壤有效硒的比例对水稻籽粒有机硒的累积也有一定影响。
Pot experiments were conducted to analyze the absorption and distribution of selenium in high and low selenium-enriched rice plants, the accumulation characteristics of organic selenium in brown rice and the change of soil available selenium. The results showed that the distribution of selenium in two parts of rice was completely consistent, which were root> stem and leaf> brown rice> rice husk. The content of selenium in various parts of rice and organic selenium content in brown rice increased with the increase of soil selenium level, and the content of selenium in high accumulative rice was significantly higher than that in low accumulative rice (P <0.05). At 0,0.5,1.0 And 5.0 mg kg-1 selenium levels, respectively, the former were 6.7,1.9,2.1 and 1.6 times the latter. The proportion of organic selenium in brown rice was 64.7% ~ 74.4%, however, the ratio of organic selenium to total selenium in brown rice with high and low accumulation type had no significant difference (P> 0.05). The contents of total selenium and available selenium in soil also increased gradually with the increase of selenium application rate, but the ratios of available selenium in high and low accumulative paddy soil ranged from 5.5% to 7.4% No significant difference (P> 0.05). In addition to rice genotypes, the proportion of soil available selenium also had an effect on the accumulation of organic selenium in rice grains.