Departamento de Ciencias Integradas, Fuerzas Armadas Ave., Campus El Carmen, Universidad de Huelva, 21071 Huelva, Spain.
Departamento de Ciencias de la Tierra, Fuerzas Armadas Ave., Campus El Carmen, Universidad de Huelva, 21071 Huelva, Spain.
Mar Pollut Bull. 2022 Feb;175:113375. doi: 10.1016/j.marpolbul.2022.113375. Epub 2022 Jan 29.
Seed germination and seedling establishment are very sensitive plant stages to metal pollution. Many halophyte species colonizing salt marshes are able to germinate and establish in highly contaminated habitats and low marsh halophyte species seem to show higher tolerance to metals than high marsh species. We analyzed the effects of copper, zinc and nickel in concentrations up to 2000 μM on seed germination and seedling growth in two closely related species of Sarcocornia, S. perennis, a low marsh species, and S. fruticosa, a high marsh species. Germination of both halophytes was not affected by any metal concentration, and their seedling growth, mainly radicle length, was reduced by increasing metal concentrations. Seedlings of S. perennis showed higher tolerance to the three metals than those of S. fruticosa. Our results are useful for designing ecotoxicological bioassays and planning phytoremediation projects in salt marshes.
种子萌发和幼苗建立是对金属污染非常敏感的植物阶段。许多在盐沼中定殖的盐生植物物种能够在高度污染的栖息地中萌发和建立，而低沼泽盐生植物物种似乎比高沼泽物种对金属具有更高的耐受性。我们分析了铜、锌和镍在高达 2000μM 的浓度下对两种密切相关的盐角草属植物（Sarcocornia），即低沼泽物种 S. perennis 和高沼泽物种 S. fruticosa 的种子萌发和幼苗生长的影响。两种盐生植物的萌发都不受任何金属浓度的影响，而它们的幼苗生长，主要是胚根长度，随着金属浓度的增加而减少。S. perennis 的幼苗对这三种金属的耐受性高于 S. fruticosa 的幼苗。我们的结果对于设计盐沼生态毒理学生物测定和规划植物修复项目是有用的。
