白肋烟中硒的赋存形态及分布研究

Study on the Distribution and Occurrence Pattern of Selenium in Burley

研究了叶面喷施补硒盆栽白肋烟叶中硒的赋存形态和含量分布,结果表明:叶片吸收的无机硒进入白肋烟体内代谢、转化为多种形态有机硒,叶中的核酸、多糖和蛋白质结合硒是硒的主要赋存形态,分别占总硒量的74.54%,10.95%,2.30%,生物大分子有机硒占总硒量的87%以上;在蛋白质的分级盐析组分中,其硒的分布为:D>C>B>E>A(即80%、70%、60%、95%、50%硫酸铵饱和度),分别占蛋白质结合硒的41.05%、26.49%、21.46%、12.81%、0.25%.

The distribution and combined forms of selenium in burley with adding selenium plant in pots were studied. It is found that burley can enrich selenium through the leaves of absorbing selenite and transform selenium into various organic selenium by metabolism. Nucleic acid, polysaccharide and protein combined selenium were main occurrence patterns,accounting for 2. 30% , 10. 95% ,74. 54% of the total Se. The organic selenium of biological mac-romolecule accounts for over 87% in total selenium; The contents of combined selenium of constituent of grade salting - out in protein hold 41. 05% ,26. 49% ,21. 46% , 12. 81% ,0. 25% in total Se - protein,and Se content arrangement was D>C>B>E>A.