Enberg A, Wu L
Department of Environmental Horticulture, University of California, Davis 95616-8587, USA.
Ecotoxicol Environ Saf. 1995 Nov;32(2):171-8. doi: 10.1006/eesa.1995.1099.
A comparative study of selenium (Se) assimilation under the influence of sulfate and chloride salt salinity was conducted on two saltgrass ecotypes. The inland saltgrass grows successfully on the soil contaminated with elevated Se concentrations at Kesterson, Merced County, California. The coastal saltgrass colonizes a tidal salt marsh in Bodega Bay on the coast of California. The saltgrass samples were grown in sand culture and irrigated with quarter concentration of modified Hoagland solution supplemented with different concentrations of Se with or without sulfate or chloride salt. The Bodega Bay plants exhibited greater tolerance to both the sulfate and chloride salinity than the Kesterson plants. The plants of both ecotypes accumulated about 90% of their total tissue Se in the nonprotein fraction. When sulfate was present in the irrigation solution, the Kesterson plants assimilated significantly less Se in its protein and nonprotein fractions than in the Bodega Bay plants. Under Se treatment, chlorosis symptoms were found on the leaves of the Bodega Bay plants, but not on the leaves of the Kesterson plants. The above results demonstrate that the two saltgrasses are distinct ecotypes in respect to their salinity tolerance and the ability of mitigation of selenium assimilation in the presence of sulfate.
对两种盐草生态型在硫酸盐和氯化物盐盐分影响下的硒（Se）同化进行了比较研究。内陆盐草在加利福尼亚州默塞德县凯斯特森受高浓度硒污染的土壤上成功生长。沿海盐草生长在加利福尼亚州海岸博德加湾的潮汐盐沼中。盐草样本在砂培中生长，并用添加了不同浓度硒（有或没有硫酸盐或氯化物盐）的四分之一浓度改良霍格兰溶液灌溉。博德加湾的植物对硫酸盐和氯化物盐分的耐受性均高于凯斯特森的植物。两种生态型的植物在非蛋白质部分积累了约90%的总组织硒。当灌溉溶液中存在硫酸盐时，凯斯特森植物在其蛋白质和非蛋白质部分同化的硒明显少于博德加湾的植物。在硒处理下，博德加湾植物的叶片出现了黄化症状，但凯斯特森植物的叶片没有。上述结果表明，两种盐草在耐盐性以及在有硫酸盐存在时减轻硒同化的能力方面是不同的生态型。
