Abstract
The presence of calcium is essential for chloroplast movement induced by blue light in Lemna trisulca L. The regulatory role of calcium was confirmed by the inhibition of chloroplast movement by cytochalasin B and trifluoperazine. The calcium concentration in tissues was modified by ethylene glycol-bis(2-aminoethylether)-N,N,N′, N′-tetraacetic acid (EGTA), the calcium ionophore A23187 and La3+. Only a long period of incubation (12h) in EGTA or La3+ caused distrubances in chloroplast movement. This indicates that calcium influx is not essential for chloroplast movement. Those conditions that dramatically changed the internal calcium concentration, either applications of calcium ionophore A23187 and EGTA, or ionophore and La3+, markedly decreased the amplitude of response to blue-light pulses. This demonstrates that disturbances of chloroplast movement are observable only when internal stores of calcium are affected by Ca2+-antagonists. We suggest that the calcium involved in blue-light-induced chloroplast movement is derived from intracellular stores. The addition of Mg2+ to EGTA buffer counteracted its effect, indicating that Mg2+, as well as Ca2+, might possibly be involved in chloroplast movement.
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Abbreviations
- EGTA:
-
ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid
- Hepes:
-
4(2-hydroxyethyl-1-piperazine) ethanesulfonic acid
- A23187:
-
calcium ionophore
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We express our gratitude to Professor W. Korohoda for valuable critical comments on this paper and stimulating discussion. We also thank Mr. P. Malec for help in preparing the experiment with trifluoperazine and Mr. A. Waloszek for taking the photographs. We are indebted to Mr. Tim Kline (International House, Krakow, Poland) for improving the English style. This research was supported by grant No. 1042/P2/92/03 from the State Committe for Scientific Research.
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Tlałka, M., Gabryś, H. Influence of calcium on blue-light-induced chloroplast movement in Lemna trisulca L.. Planta 189, 491–498 (1993). https://doi.org/10.1007/BF00198211
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DOI: https://doi.org/10.1007/BF00198211