Abubakari Farida, Mesjasz-Przybyłowicz Jolanta, Przybyłowicz Wojciech J, van der Ent Antony
Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, Sir James Foots Building, Brisbane, QLD, Australia.
Department of Botany and Zoology, Stellenbosch University, Private Bag, Matieland, South Africa.
AoB Plants. 2020 Nov 13;12(6):plaa058. doi: 10.1093/aobpla/plaa058. eCollection 2020 Dec.
The Malaysian state of Sabah on the Island of Borneo has recently emerged as a global hotspot of nickel hyperaccumulator plants. This study focuses on the tissue-level distribution of nickel and other physiologically relevant elements in hyperaccumulator plants with distinct phylogenetical affinities. The roots, old stems, young stems and leaves of (Salicaceae), (Phyllanthaceae), (Rubiaceae) and young stems and leaves of (Phyllanthaceae) were studied using nuclear microprobe (micro-PIXE and micro-BS) analysis. The tissue-level distribution of nickel found in these species has the same overall pattern as in most other hyperaccumulator plants studied previously, with substantial enrichment in the epidermal cells and in the phloem. This study also revealed enrichment of potassium in the spongy and palisade mesophyll of the studied species. Calcium, chlorine, manganese and cobalt were found to be enriched in the phloem and also concentrated in the epidermis and cortex of the studied species. Although hyperaccumulation ostensibly evolved numerous times independently, the basic mechanisms inferred from tissue elemental localization are convergent in these tropical woody species from Borneo Island.
位于婆罗洲岛的马来西亚沙巴州最近成为全球镍超富集植物的热点地区。本研究聚焦于具有不同系统发育亲缘关系的超富集植物中镍及其他生理相关元素的组织水平分布。使用核微探针（微束质子激发X射线发射分析和微束背散射分析）对杨柳科的垂柳、叶下珠科的叶下珠、茜草科的丰花草以及叶下珠科的叶下珠的根、老茎、幼茎和叶进行了研究。在这些物种中发现的镍的组织水平分布与之前研究的大多数其他超富集植物具有相同的总体模式，在表皮细胞和韧皮部中大量富集。本研究还揭示了所研究物种的海绵状和栅栏状叶肉中钾的富集。钙、氯、锰和钴在韧皮部中富集，并且也集中在所研究物种的表皮和皮层中。尽管超积累表面上多次独立进化，但从组织元素定位推断出的基本机制在这些来自婆罗洲岛的热带木本物种中是趋同的。
