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The manganese (Mn) hyperaccumulator  Gossia bidwillii  is a tree species native to subtropical eastern Australia where it occurs on Mn-rich soils. Here, we conducted the first Mn accumulation and tissue-level distribution study on wild and experimentally grown  G. bidwillii .  Gossia bidwillii  plants were subjected to different levels of Mn (250 µg g −1 , 500 µg g −1 , 1000 µg g −1 ) soil dosing treatments, whereas the wild  G. bidwillii  was sampled from growing on highly Mn-enriched natural soils. We used laboratory-based micro-X-ray Fluorescence (µXRF) elemental mapping to elucidate in situ distribution patterns of Mn and other elements in hydrated wild and Mn-dosed  G. bidwillii  leaves. The data from wild  G. bidwillii  revealed that it can be strongly Mn-hyperaccumulating with foliar Mn concentrations of 39 000 µg g −1  and 24 000 µg g −1  in old and young leaves, respectively. In the Mn dosing trial,  G. bidwillii  accumulated 24 400 µg g −1  in old leaves and 17 100 µg g −1  in young leaves in the highest treatment level. The laboratory based µXRF data revealed that Mn is uniformly enriched throughout the laminae and petioles of both young and old leaves in wild  G .  bidwillii ; while in Mn-dosed  G. bidwillii , the foliar Mn distribution was primarily concentrated at the leaf-tip and lamina. The approach employed by combining data from the field and controlled experiments was especially meaningful for investigating Mn accumulation in this species and gaining added insight into the phenomenon of Mn hyperaccumulation.

Manganese Accumulation and Tissue-level Distribution in the Australian Hyperaccumulator Gossia Bidwillii (Myrtaceae)