Water and H2O2 Permeability of Aquaporins Isolated from Cucumber and Figleaf Gourd
2010
Cucumber aquaporin gene, CsPIP1;1 and figleaf gourd aquaporin gene CfPIP2;1 were injected to Xenopus oocytes in order to study water transport activity. While CsPIP1;1 did not transport any water and was not responsive to mercury, oocyte injected with CfPIP2;1 rapidly increased their volume without saturation indicating active water transport. Calculation of water permeability of oocytes clearly distinguished the two genes. In response to exogenous application of H₂O₂, only CfPIP2;1 responded, reducing osmotic water permeability. Transgenic Arabidopsis plants overexpressing aquaporin genes did not respond to applied H₂O₂.
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