Extracellular and intracellular determination of light-induced potential changes during photophobic reactions in blue-green algae
✍ Scribed by Donat-P. Häder
- Publisher
- Springer
- Year
- 1978
- Tongue
- English
- Weight
- 449 KB
- Volume
- 119
- Category
- Article
- ISSN
- 0302-8933
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✦ Synopsis
Light-induced potential changes have been measured in the filamentous blue-green alga Phormidium uncinatum both intracellularly and between the two ends ofa trichome. There is evidence that these potential changes are correlated with photophobic reactions in this organism.
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The potential changes follow the light-dark regime with a lag phase of about 10 s. The photophobic reaction time has been found to be about the same length of time.
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The action spectra of both externally and internally measured light-induced potential changes correspond with the photophobic action spectrum, indicating the participation of the main photosynthetic pigments of Phormidium, chlorophyll a and phycobilins.
A hypothesis is being discussed according to which sensory transduction between photoreceptor and motor apparatus of the cell is mediated by light-induced electrical potential changes.