Abstract
In leaf epidermal cells of the aquatic angiosperm Vallisneria gigantea Graebner, high-intensity blue light induces the actin-dependent avoidance response of chloroplasts. By semi-quantitative motion analysis and phalloidin staining, time courses of the blue-light-induced changes in the mode of movement of individual chloroplasts and in the configuration of actin filaments were examined in the presence and absence of a flavoprotein inhibitor, diphenylene iodonium. In dark-adapted cells, short, thick actin bundles seemed to surround each chloroplast, which was kept motionless in the outer periclinal cytoplasm of the cells. After 10 min of irradiation with high-intensity blue light, a rapid, unidirectional movement of chloroplasts was induced, concomitant with the appearance of aggregated, straight actin bundles stretched over the outer periclinal cytoplasm. Diphenylene iodonium inhibited the avoidance response of chloroplasts, apparently by delaying a change in the mode of chloroplast movement from random sway to unidirectional migration, by suppressing the appearance of aggregated, straight actin bundles. In partially irradiated individual cells, redistribution of chloroplasts and reorganization of actin filaments occurred only in the areas exposed to blue light. From the results, we propose that the short, thick actin bundles in the vicinity of chloroplasts function to anchor the chloroplasts in dark-adapted cells, and that the aggregated, straight actin bundles organized under blue-light irradiation provide tracks for unidirectional movement of chloroplasts.
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Abbreviations
- DPI :
-
Diphenylene iodonium
- P-side :
-
Cytoplasmic layer that faces the outer periclinal wall
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Acknowledgements
This work was partly supported by Grants-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture, Japan, to S.T. and by a Sasagawa Scientific Research Grant from the Japan Science Society to N.S.
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Preliminary results of part of the local irradiation study have already been reported in abstract form [N. Sakurai et al. (2002) J Photosci 9:326–328].
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Sakurai, N., Domoto, K. & Takagi, S. Blue-light-induced reorganization of the actin cytoskeleton and the avoidance response of chloroplasts in epidermal cells of Vallisneria gigantea. Planta 221, 66–74 (2005). https://doi.org/10.1007/s00425-004-1416-1
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DOI: https://doi.org/10.1007/s00425-004-1416-1