论文部分内容阅读
为了揭示硫酸盐处理下小麦对亚硒酸盐和硒酸盐的吸收与转运规律,通过溶液培养,研究了不同浓度硫硒交互下小麦各部位的硒含量变化.结果表明,与无硫处理相比,0.1 mmol·L-1硫使小麦对硒酸盐的吸收潜力(Vmax值)和亲和力(1/Km值)分别降低了25.7%和90.8%,硫酸盐主要是通过降低小麦根系对硒酸盐的亲和力来缩小其与亚硒酸盐的吸收差异.小麦硒转移系数(TF值)随亚硒酸盐浓度的升高显著下降,降幅最高达35.3%,硫酸盐对其无显著影响;TF值随溶液中硒酸盐浓度的升高显著上升,最高增幅达53.8%,硫酸盐对其有显著促进作用.经亚硒酸盐处理后,无论施硫与否,小麦根部累积的硒均会随培养时间的延长显著向地上部运输;而经硒酸盐处理后,小麦根部累积的硒只在硫酸盐存在下才会随培养时间的延长显著运往地上部.富硒地区施用硫肥既可防止土壤硒的过度消耗,又可促进硒向可食部位的转移.
In order to reveal the absorption and transport of selenite and selenate in wheat under sulfate treatment, the changes of selenium content in wheat at different concentrations of selenium and selenium were studied by solution culture.The results showed that with the sulfur-free phase Compared with the control, 0.1 mmol·L-1 sulfur reduced the absorption potential (Vmax) and affinity (1 / Km) of selenate to wheat by 25.7% and 90.8%, respectively. Sulfate reduced selenate Salt affinity to reduce its absorption difference with the selenite.The TF value of wheat decreased significantly with the increase of the concentration of selenite, the highest decrease was 35.3%, and the sulfate had no significant effect on it; TF The value increased significantly with the increase of selenate concentration in the solution, the highest increase rate was 53.8%, and sulfate was significantly promoted.After selenite treatment, regardless of the application of sulfur or not, the accumulation of selenium in wheat root would be The selenium accumulated in the root of wheat was significantly transported to the shoots with the prolongation of culture time only after the selenate treatment.The accumulation of selenium in the selenium- Prevent excessive consumption of soil selenium, but also promote selenium to edible The transfer of the site.