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Differences in copper (Cu) absorption and transport, physiological responses and structural characteristics between two types of Cu-resistant plants,  Oenothera glazioviana  (Cu-exclusion type) and  Elsholtzia haichowensis  (Cu-enrichment type), were investigated in the present study. The results indicated the following: (1) After 50 μM Cu treatment, the Cu ratio in the xylem vessels of  E .  haichowensis  increased by 60%. A Cu adsorption experiment indicated that  O .  glazioviana  exhibited greater resistance to Cu, and Cu absorption and the shoot/root ratio of Cu were significantly lower in  O .  glazioviana  than in  E .  haichowensis . (2) An analysis of the endogenous abscisic acid (ABA) variance and exogenous ABA treatment demonstrated that the ABA levels of both plants did not differ; exogenous ABA treatment clearly reduced Cu accumulation in both plants. (3) The leaf stomatal density of  O .  glazioviana  was significantly less than that of  E .  haichowensis . Guard cells in  E .  haichowensis  plants were covered with a thick cuticle layer, the epidermal hair was more numerous and longer, and the number of xylem conduits in the root was small. (4) The transpiration rate and the stomatal conductance of  O .  glazioviana  were both significantly lower than those of  E .  haichowensis , regardless of whether the plants were treated with Cu. Taken together, these results indicate that the differences in the structural characteristics between these two plant species, particularly in the characteristics related to plant transpiration, are important factors that govern whether plants acquire or exclude Cu.

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Differences in Copper Absorption and Accumulation between Copper-Exclusion and Copper-Enrichment Plants: A Comparison of Structure and Physiological Responses