White Philip J, Bowen Helen C, Marshall Bruce, Broadley Martin R
Scottish Crop Research Institute, Invergowrie, Dundee, UK.
Ann Bot. 2007 Jul;100(1):111-8. doi: 10.1093/aob/mcm084. Epub 2007 May 24.
Selenium (Se) and sulfur (S) exhibit similar chemical properties. In flowering plants (angiosperms) selenate and sulfate are acquired and assimilated by common transport and metabolic pathways. It is hypothesized that most angiosperm species show little or no discrimination in the accumulation of Se and S in leaves when their roots are supplied a mixture of selenate and sulfate, but some, termed Se-accumulator plants, selectively accumulate Se in preference to S under these conditions.
This paper surveys Se and S accumulation in leaves of 39 angiosperm species, chosen to represent the range of plant Se accumulation phenotypes, grown hydroponically under identical conditions.
The data show that, when supplied a mixture of selenate and sulfate: (1) plant species differ in both their leaf Se (Se) and leaf S (S) concentrations; (2) most angiosperms show little discrimination for the accumulation of Se and S in their leaves and, in non-accumulator plants, Se and S are highly correlated; (3) Se in Se-accumulator plants is significantly greater than in other angiosperms, but S, although high, is within the range expected for angiosperms in general; and (4) the Se/S quotient in leaves of Se-accumulator plants is significantly higher than in leaves of other angiosperms.
The traits of extraordinarily high Se and leaf Se/S quotients define the distinct elemental composition of Se-accumulator plants.
硒（Se）和硫（S）具有相似的化学性质。在开花植物（被子植物）中，硒酸盐和硫酸盐通过共同的转运和代谢途径被吸收和同化。据推测，当大多数被子植物的根系供应硒酸盐和硫酸盐混合物时，它们在叶片中积累硒和硫时几乎没有或没有差异，但有些植物，即所谓的富硒植物，在这些条件下优先选择性积累硒而非硫。
本文调查了39种被子植物叶片中硒和硫的积累情况，这些植物被选来代表植物硒积累表型的范围，在相同条件下进行水培生长。
数据表明，当供应硒酸盐和硫酸盐混合物时：（1）植物物种在叶片硒（Se）和叶片硫（S）浓度上存在差异；（2）大多数被子植物在叶片中积累硒和硫时几乎没有差异，在非积累植物中，Se和S高度相关；（3）富硒植物中的Se显著高于其他被子植物，但S虽然较高，但在一般被子植物预期的范围内；（4）富硒植物叶片中的硒/硫商显著高于其他被子植物叶片。
叶片中Se极高和叶片硒/硫商的特征定义了富硒植物独特元素组成。
