Effect of CopperII LeadII and ZincII on Gr

Authors: Eduardo M Leaño KaLai Pang

Publish Date: 2010/03/12

Volume: 213, Issue: 1-4, Pages: 85-93

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Abstract

This study evaluated the effect of lead PbII zinc ZnII and copper CuII on growth and sporulation of four Halophytophthora species Halophytophthora vesicula Halophytophthora elongata Halophytophthora spinosa var lobata and an oogoniaproducing Halophytophthora sp isolated from different mangrove sites in Taiwan Results show that all isolates grew well or even better at 1 ppm concentration of the heavy metals tested Growth of all test isolates was totally inhibited at 500 ppm except for H spinosa var lobata exposed to ZnII For sporulation all isolates produced moderate to abundant zoosporangia or oogonia at 1 ppm PbII and ZnII Production of zoosporangia by H vesicula H elongata and H spinosa var lobata was significantly affected or totally inhibited at 1 ppm PbII and ZnII and all concentrations of CuII Abnormal oogonia were produced by Halophytophthora sp at 10 ppm CuII and 100 ppm of the three heavy metals In general CuII and ZnII were found to be the most toxic and the least toxic was PbII H spinosa var lobata was the most tolerant to all the heavy metals while H vesicula and H elongata were the most sensitive Results of this study shows that increased concentrations of PbII CuII and ZnII in the mangrove environment can significantly affect growth and impair normal reproduction of Halophytophthora speciesThis study was supported by the National Science Council of Taiwan Project No NSC 972621B019002 and Centre of Marine Biology and Biotechnology CMBB National Taiwan Ocean University We thank YuChen Lin and HsinHsiang Chen for their technical assistance during samplings and laboratory works

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