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The effect of metals on the photosynthetic activities and epidermal polyphenol content of  Prosopis glandulosa  and  Prosopis juliflora  leaves was investigated by the tissue tolerance test. Foliar tissues of  Prosopis glandulosa  and  Prosopis juliflora  were incubated with Cd 2+  (0.001 M) or Cu 2+  (0.52 M) concentrations for 96 h. The results showed that significant reductions (p &lt; 0.05) of photochemical efficiency in  P .  juliflora  leaves were found after 96 h of exposure to 0.52 M Cu 2+  compared with Cd-treatments and controls. In contrast,  P .  glandulosa  leaves showed a progressive increase on photochemical efficiency at 72 h after Cu-treatment. The results also showed a significant decrease (p &lt; 0.05) of epidermal polyphenols in  P .  juliflora  leaves after 24 h of exposure to 0.52 M Cu 2+  compared with Cd-treatments and control leaves. On the other hand, the values of leaf epidermal polyphenols observed in  P .  glandulosa  exposed to copper and cadmium did not show any difference with respect to control. These findings are very important and suggest that these compounds could be considered as a protection mechanism of  P .  glandulosa  when is treated with these heavy metals. Finally, the results of bioaccumulation showed that the copper concentration in  P .  glandulosa  was higher than the values detected in  P .  juliflora  Nevertheless, the cadmium concentration in foliar tissues of  P .  juliflora  was significantly higher than  P .  glandulosa  after 96 h of exposure to Cu 2+  or Cd 2+ . Therefore, future studies are necessary to elucidate the effects of heavy metals on the biosynthesis of flavonoids and participation of these compounds in the reduction of metal toxicity in  Prosopis  species.

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Changes of photochemical efficiency and epidermal polyphenols content of  Prosopis glandulosa  and  Prosopis juliflora  leaves exposed to cadmium and copper