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Isolation of protoplasts and ion channel recording of plasma membrane patches and whole-cell recordings of the marine alga, Ulva pertusa (Chlorophyta)

  • Shenghao Liu
  • Xiaohang Huang
  • Chenlin Liu
  • Bailin Cong
  • Guang Han
Article

Abstract

Whole-cell patch-clamp techniques were used to study ion channels of a marine alga. High quality protoplasts suitable for electrophysiological studies were isolated from the green marine alga, Ulva pertusa, using enzyme mixtures consisting of cellulase and abalone power and identified by calcofluor fluorescence. The vitality of protoplasts varied depending on the alga growth stage, and those isolated from younger tissue in March maintained a high vitality with high sealing success rate compared with protoplasts isolated from mature or non-growing plants in August or November. In the whole-cell configuration, large inward currents were elicited by negative voltage pulses. The voltage-dependent component was predominantly carried by Cl, as confirmed by the use of the Cl channel inhibitor DIDS and reversal potential of current-voltage plots. This evidence suggests that hyperpolarization-activated Cl permeable channels are responsible for the influx of Cl into U. pertusa cells. Voltage-dependent outward currents were also recorded in several protoplasts, and their properties need further investigation.

Keywords

Ion channel Patch clamp Plasmalemma Protoplast isolation Ulva pertusa 

Notes

Acknowledgements

The research was financially supported by the National Natural Science Foundation of China (No. 40306026).

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Shenghao Liu
    • 1
  • Xiaohang Huang
    • 1
  • Chenlin Liu
    • 1
  • Bailin Cong
    • 1
  • Guang Han
    • 1
  1. 1.Key Laboratory of Marine Bioactive Substances, The First Institute of OceanographyState Oceanic AdministrationQingdaoChina

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