茎瘤芥对硒的吸收、转化及其富集特征研究

为了探讨硒在茎瘤芥中的吸收、富集机制,本试验采用不同浓度(0、1和2.5 mg.L-1)的Na2SeO3进行茎瘤芥叶面喷施田间试验,研究茎瘤芥对硒的吸收、转化和利用规律,以及硒对茎瘤芥生长的影响。结果表明,在适宜硒浓度(1 mg.L-1)下,供试作物茎瘤芥产量提高,未达到显著水平；茎瘤芥中硝酸盐含量下降到最低点,还原糖、游离氨基酸和Vc则为相反趋势,在Se 1 mg.L-1上升到最高,分别与对照组相比增加了46.73%、40.41%和13.36% ；茎瘤芥总硒含量和有机硒含量随硒浓度升高而增加,且呈显著正相关,较对照分别增加了74.0%~271.5%和46.1%~193.9%,而茎瘤芥有机硒转化率也会随硒浓度的增加而显著增加,较对照组分别上升了23.57%和19.33%。

Effect of Exogenous Selenium on Selenium From and Selenium Uptake by Brassica tumida Tsenet Lee

Toexploretheabsorptionandenrichmentmechanismofexogenousseleniumin Brassica tumida Tsenet Lee, we carried out field experiments with foliar spraying different concentrations of Na2SeO3 (0, 1, 2.5 mg/L), and studied the rules of selenium absorption, transformation and utilization of Brassica tumida Tsenet Lee, and the effect of selenium on the growth of Brassica tumida Tsenet Lee. The results showed that: at the suitable concentration of Se (1 mg/L), the yield of Brassica tumida Tsenet Lee increased but the difference was not significance; the content of nitrate in Brassica tumida Tsenet Lee reduced to the lowest point by the foliar spraying, while the content of reducing sugar, free amino acid and Vc showed an opposite trend and reached the highest point with the same concentration (1 mg/L), compared with the control, increased by 46.73%, 40.41%, 13.36%, respectively; with the increasing of foliar spraying Se, the concentration of total Se and organic Se increased by 74.0%-271.5% and 46.1% - 193.9%, respectively, compared with the control, and showed a significant positive correlation; with the increasing concentration of Se in Brassica tumida Tsenet Lee, the transformation rate of organic Se significantly increased by 23.57% and 19.33% compared with the control respectively.