Response to copper bromide exposure in Vicia sativa L. seeds: Analysis of genotoxicity, nucleolar activity and mineral profile

摘要

Copper bromide (CuBr_2) effects on seed germination and plantlet development of Vicia sativa L. are evaluated through mitotic index, chromosome aberrations, nucleolar activity and mineral profile. CuBr_2 induces a significant presence of micronuclei, sticky and c-metaphases/anaphase bridges and chromosome breaks. Increased number of nucleoli and scattering of AgNOR proteins from the nucleolus in the nuclear surface at CuBr_2 1 mM and in the cytoplasm at CuBr_2 5 mM, goes along with the decrease of root growth. In V. sativa embryo the content of many macro and micronutrients increases up to copper 1 mM in agreement with reserve mobilization while at CuBr_2 5 mM some elements are present in lower amount. We hypothesize that inhibitory effects observed at 5 mM are due either to a nutrient shortage or to a direct influence of copper on root cell division, evidenced by low mitotic index, high occurrence of chromosome aberrations and loss of material from the nucleolus.