Plant Ecophysiology Team, Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Katowice, Poland.
Institute for Ecology of Industrial Areas, Katowice, Poland.
Plant Cell Environ. 2020 Dec;43(12):3002-3019. doi: 10.1111/pce.13883. Epub 2020 Oct 14.
Pseudometallophytes are commonly used to study the evolution of metal tolerance and accumulation traits in plants. Within the Arabidopsis genus, the adaptation of Arabidopsis halleri to metalliferous soils has been widely studied, which is not the case for the closely related species Arabidopsis arenosa. We performed an in-depth physiological comparison between the A. halleri and A. arenosa populations from the same polluted site, together with the geographically close non-metallicolous (NM) populations of both species. The ionomes, growth, photosynthetic parameters and pigment content were characterized in the plants that were growing on their native site and in a hydroponic culture under Cd treatments. In situ, the metallicolous (M) populations of both species hyperaccumulated Cd and Zn. The NM population of A. halleri hyperaccumulated Cd and Zn while the NM A. arenosa did not. In the hydroponic experiments, the NM populations of both species accumulated more Cd in their shoots than the M populations. Our research suggests that the two Arabidopsis species evolved different strategies of adaptation to extreme metallic environments that involve fine regulation of metal homeostasis, adjustment of the photosynthetic apparatus and accumulation of flavonols and anthocyanins.
假金属植物通常被用于研究植物金属耐受性和积累特性的进化。在拟南芥属中，对富含金属土壤的拟南芥 halleri 的适应已经得到了广泛的研究，而与其密切相关的拟南芥 arenosa 则并非如此。我们对来自同一污染地点的 A. halleri 和 A. arenosa 种群进行了深入的生理比较，同时还比较了这两个物种的地理上接近的非金属（NM）种群。我们在植物生长的原生地和 Cd 处理的水培培养中对离子组、生长、光合作用参数和色素含量进行了表征。在原地，两种物种的金属种群都超积累 Cd 和 Zn。A. halleri 的 NM 种群超积累 Cd 和 Zn，而 A. arenosa 的 NM 种群则没有。在水培实验中，两种物种的 NM 种群在地上部分积累的 Cd 比 M 种群多。我们的研究表明，这两个拟南芥物种进化出了不同的适应极端金属环境的策略，涉及到金属内稳态的精细调节、光合作用器官的调整以及类黄酮和花青素的积累。
