Effect of exogenous spermidine on polyamine metabolism in water hyacinth leaves under mercury stress |
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Authors: | Chunxia Ding Guoxin Shi Xiaoying Xu Haiyang Yang and Ye Xu |
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Institution: | (1) College of Life Science, Nanjing Normal University, 210046 Nanjing, Jiangsu, China; |
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Abstract: | The influence of exogenous spermidine (Spd) on arginine decarboxylase (ADC), ornithine decarboxylase (ODC), polyamine oxidase
(PAO) activities and polyamines (PAs), proline contents in water hyacinth leaves under Mercury (Hg) stress was investigated
after 6 days treatment. The results showed that free putrescine (Put) content increased, the contents of free spermidine (Spd)
and spermine (Spm) and the (Spd + Spm)/Put ratio in water hyacinth leaves decreased significantly with the increase of the
Hg concentrations. Hg stress also disturbed the activities of ADC, ODC and PAO and caused changes on proline content. Compared
to the Hg-treatment only, exogenous Spd (0.1 mM) significantly reduced the accumulation of free Put, increased the contents
of free Spd and Spm and the ratio of (Spd + Spm)/Put in water hyacinth leaves. Furthermore, exogenous Spd enhanced the activities
of ADC, ODC and PAO and significantly increased proline content. The PS-conjugated PAs and PIS-bound PAs changed in the same
trend as free PAs. These results suggest that exogenous Spd can alleviate the metabolic disturbance of polyamines caused by
Hg in water hyacinth leaves. |
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