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Reproductive and yield responses of B. nigra upon exposure to ZnO and CuO nanoparticles. Error bars represent the SE (n = 6), and similar letters mean no statistical difference between treatments in Tukey’s test (p ≤ 0.05). 5 (A) and (B) Number of flowers and pods per plant; (C) and (D) seed weight per plant and seed weight/1000 seeds; and (E) and (F) seed diameter in the presence of ZnO and CuO NPs, respectively.
