首页|Leaf structural traits of two Restinga plant species with different resistance patterns to iron toxicity
Leaf structural traits of two Restinga plant species with different resistance patterns to iron toxicity
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NSTL
Canadian Science Publishing
Iron mining activities are a source of particulate iron, which contaminates soil and plants of Restinga biome (Brazil). To investigate the possible effects of iron toxicity on Ipomoea pes-caprae (L) R. Br. and Canavalia rosea (Sw.) DC. leaves, plants were submitted to different exposure times (12, 36,108, and 228 hours) and iron concentrations (0.5 or 150 mg.L-1 Fe2+ as FeSO4 center dot 7H(2)O). After 108 hours of iron excess treatment, C. rosea leaves were chlorotic, whereas I. pes-caprae leaves presented venal chlorosis and bronzing after 228 hours of iron excess treatment. The anatomical alterations in I. pes-caprae were more intense and appeared after 36 hours, which was earlier than in C. rosea. The leaf epidermal cells of I. pes-caprae presented alterations in organization, size, and shape, and for both species the epicuticular wax was altered and wax rupture occurred dose to the stomata. The positive staining for the presence of iron in leaf tissues matches with damaged areas in I. pes-caprae leaves, indicating direct iron toxicity. Ipomoea pes-caprae presented the most severe symptoms, whereas C. rosea presented the most resistance. The results suggest that, over time, the emission of particulate matter may negatively impact the ecological succession and biodiversity of Restinga.
NSTL
Canadian Science Publishing
