Negrin Vanesa L, Teixeira Bárbara, Godinho Rita M, Mendes Rogério, Vale Carlos
IPMA - Portuguese Institute for the Sea and Atmosphere, R. Alfredo Magalhães Ramalho, 6, 1495-006 Lisbon, Portugal.
IPMA - Portuguese Institute for the Sea and Atmosphere, R. Alfredo Magalhães Ramalho, 6, 1495-006 Lisbon, Portugal.
Mar Pollut Bull. 2017 Aug 15;121(1-2):78-84. doi: 10.1016/j.marpolbul.2017.05.045. Epub 2017 May 26.
Phytochelatins (PCs) and monothiols and their relation with trace element concentrations were studied in three plant species from two Portuguese salt marshes. Belowground tissues showed always higher element concentrations, while enhanced values of monothiols were found in aboveground biomass. Glutathione was usually the most abundant monothiol. The concentration of total PCs was higher in leaves or stems than in roots of Halimione portulacoides and Sarcocornia perennis, while in Spartina maritima the highest concentrations were reported in large roots. PC was synthesized by all tissues and species and was higher in large roots of S. maritima. PC and PC were in high levels in small roots of S. maritima. PC was positively correlated with As, Zn and Pb. Although being the first evidence of PCs and monothiols in these species under natural conditions, our results do not point to a simple relationship with elements concentrations, suggesting a complex mechanism involved.
对来自葡萄牙两个盐沼的三种植物中的植物螯合肽（PCs）、单硫醇及其与微量元素浓度的关系进行了研究。地下组织的元素浓度始终较高，而地上生物量中的单硫醇含量有所增加。谷胱甘肽通常是最丰富的单硫醇。在海滨碱蓬和多年生盐角草的叶片或茎中，总PCs的浓度高于根部，而在互花米草中，大根中的PCs浓度最高。所有组织和物种都能合成PC，互花米草大根中的PC含量更高。互花米草小根中的PC2和PC3含量较高。PC与砷、锌和铅呈正相关。尽管这是这些物种在自然条件下PCs和单硫醇的首个证据，但我们的结果并未表明其与元素浓度存在简单关系，这表明其中涉及复杂机制。
