Abstract
In caulonemal filaments of the mossPhyscomitrella patens (Hedw.), red light triggers a phytochrome-mediated transient depolarisation of the plasma membrane and the formation of side branch initials. Three-electrode voltage clamp and ion flux measurements were employed to elucidate the ionic mechanism and physiological relevance of the red-light-induced changes in ion transport. Current-voltage analyses indicated that ion channels permeable to K+ and Ca2+ are activated at the peak of the depolarisation. Calcium influx evoked by red light coincided with the depolarisation in various conditions, suggesting the involvement of voltage-gated Ca2+ channels. Respective K+ fluxes showed a small initial influx followed by a dramatic transient efflux. A role of anion channels in the depolarising current is suggested by the finding that Cl− efflux was also increased after red light irradiation. In the presence of tetraethylammonium (10 mM) or niflumic acid (1 μM), which block the red-light-induced membrane depolarisation and ion fluxes, the red-light-promoted formation of side branch initials was also abolished. Lanthanum (100 μM), which inhibits K+ fluxes and part of the initial Ca2+ influx activated by red light, reduced the development of side branch initials in red light by 50%. The results suggest a causal link between the red-light-induced ion fluxes and the physiological response. The sequence of events underlying the red-light-triggered membrane potential transient and the role of ion transport in stimulus-response coupling are discussed in terms of a new model for ion-channel interaction at the plasma membrane during signalling.
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Abbreviations
- [Ca2+]c :
-
cytosolic free Ca2+
- I-V:
-
current-voltage
- E:
-
equilibrium potential
- Pr:
-
red-light-absorbing phytochrome form
- Pr:
-
far-red-light-absorbing phytochrome form
- SPQ:
-
6-methoxy-l-(3-sulphonatopropyl)quinolinium
- TEA:
-
tetraethylammonium
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Ermolayeva, E., Sanders, D. & Johannes, E. Ionic mechanism and role of phytochrome-mediated membrane depolarisation in caulonemal side branch initial formation in the mossPhyscomitrella patens . Planta 201, 109–118 (1997). https://doi.org/10.1007/BF01007695
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DOI: https://doi.org/10.1007/BF01007695