土壤硒水平对两种春大豆硒吸收与转化的影响

Effect of Soil Se Level on Selenium Uptake and Transformation by Two Spring Soybean Cultivars

采用盆栽试验,在不同硒水平的土壤上研究春大豆成熟时硒在各器官中的分配与存在形态。结果表明,高硒土壤上两品种大豆籽粒中硒的积累量没有明显差异。在低硒土壤上,大豆籽粒硒的转化效率低于高硒土壤,但高硒大豆中硒的植株内转运且向籽粒的富集的能力显著较强,且有机硒/无机硒比率较高。这提出了不同品种在不同土壤硒水平下的硒运转与有机硒合成能力的不一致性问题。同时,外源富硒条件下获得的硒可能有更高的生物活性,这对于富硒大豆的生产和加工是十分有利的。

A pot experiment of Se uptake by two spring soybean cultivars with different Se affinities and using two soils with different Se levels was conducted. The Se translocation and transformation in plant organs was studied after harvest. In soils with high Se level, there was no significant difference in Se accumulation in grains between the two cultivars. However, a stronger Se translocation and accumulation, and higher ratio of organic Se to inorganic Se in grains were found in the cultivars of higher Se affinity than that of low Se affinity although Se translocation in grains was significantly lower in the soils with low Se level. This study indicates that both genotypic and soil affect Se translocation and organic Se synthesis by soybean cultivars, and also shows that difference in organic synthesis under different soil Se level. Higher Se bio-availability in soybean grains can be expected from exotic Se amendments. These may be fundamental for high-Se soybean production and processing for Se nutrition regulation both for animals and human.