Effects of Heavy Metal Zn2+on Photosynthetic Physiological Characteristics of Ulva linza
Ulva linza,a species of green tides,was selected as the experimental material,the effects of different concentrations of Zn2+on the photosynthetic and physiological characteristics of U.Linza were analyzed.The results showed that the relative growth rate of U.linza decreased significantly with the increase of Zn2+concentration.Compared with the control group,the relative growth rates decreased by 37.8％,42.1％,76.8％and 88.4％,respectively.The respiration rate and net photosynthetic rate of U.linza also decreased.When the concentration of Zn2+was 200 pmol/L,the respiratory rate and net photosynthesis rate decreased by 68.1％and 93.0％respectively compared to the control group.The yield of U.linza also decreased,with the lowest value of 0.3.Meanwhile,it was found that 50 μmol/L Zn2+treatment could promote the synthesis of Chl a and Chl b in algae.The results showed that U.linza had physiological resistance to low concentration of Zn2+,but high concentration of Zn2+would inhibit its photosynthetic and physiological characteristics.
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