Alterações fisiológicas e ultraestruturais de plântulas de tomate induzidas por chumbo
Schlagworte:
acetato de chumbo, cloroplasto, crescimento, Lycopersicon esculentumAbstract
O objetivo do trabalho foi analisar alterações na germinação das sementes, no crescimento inicial, no conteúdo de pigmentos fotossintéticos e mudanças na ultraestrutura anatômica de plântulas de Lycopersicon esculentum Mill. causadas pelo chumbo (Pb). Sementes de tomate foram submetidas a diferentes concentrações de acetato de chumbo (zero; 0,25; 0,5 e 0,75 mM). A porcentagem de germinação e emergência das plântulas reduziram na maior concentração de Pb. O comprimento e a massa seca da parte aérea e das raízes decresceram com o aumento da concentração do metal, sendo o efeito mais pronunciado no acúmulo de biomassa nas raízes. Os teores de clorofi la, carotenoides e área foliar foram prejudicados pelo Pb. As análises ultraestruturais demonstraram alterações nos tilacoides. Portanto, o Pb ocasiona redução na viabilidade das sementes, no crescimento inicial das plântulas e no conteúdo de pigmentos fotossintéticos, como consequência de alterações nos cloroplastos, produzindo danos no crescimento de plantas de tomate.
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