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Correlation between chloroplast motility and elastic properties of tobacco mesophyll protoplasts

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Abstract

Translocations of chloroplasts induced by blue light were investigated in both leaves and protoplasts isolated from leaf mesophyll of Nicotiana tabacum. In the leaf tissue, the responses of chloroplasts were similar to those observed in other, higher and lower plant species. Weak and strong light induced movements of chloroplasts towards cell walls perpendicular and parallel to the light direction, respectively. Treatment with cytochalasin D, an actin-disturbing agent, blocked the movements. This shows that actin is involved in the motile system of chloroplast translocation in tobacco. By monitoring the response of chloroplasts to light in isolated protoplasts, we addressed the question whether the presence of the cell wall is necessary for the translocations of chloroplasts to occur. In control protoplasts (isolated at room temperature from unstressed leaves), no clear light intensity-dependent changes were observed in chloroplast distribution pattern. In contrast, in protoplasts obtained from plants treated with 4 °C for 8 h the chloroplasts maintained their responsiveness to light. Atomic Force Microscopy was used to measure elastic properties of the protoplasts. Young’s modulus, which reflects rigidity of the material, was 10 times higher for protoplasts of the coldstressed plants as compared to those isolated from the control plants. The rigidity of protoplasts isolated from the plants treated with low temperature was reduced four-fold by exposure to cytochalasin D. It appears that the status of protoplast actin is a factor responsible for elasticity of protoplasts. We speculate that unknown, cold stress-induced factors, maintain the orientational movements due to anchorage of the actin cytoskeleton in the plasma membrane despite the cell wall removal.

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Authors and Affiliations

  1. Department of Plant Physiology and Biochemistry, The Jan Zurzycki Institute of Molecular Biology, Jagiellonian University, al. Mickiewicza 3, 31-120, Kraków, Poland

    Joanna Augustynowicz & Halina Gabryś

  2. Institute of Nuclear Physics, Radzikowskiego 152, 31-342, Kraków, Poland

    Małgorzata Lekka & Kveta Burda

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  1. Joanna Augustynowicz
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  2. Małgorzata Lekka
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  3. Kveta Burda
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  4. Halina Gabryś
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Correspondence to Halina Gabryś.

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Augustynowicz, J., Lekka, M., Burda, K. et al. Correlation between chloroplast motility and elastic properties of tobacco mesophyll protoplasts. Acta Physiol Plant 23, 291–302 (2001). https://doi.org/10.1007/s11738-001-0036-7

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  • DOI: https://doi.org/10.1007/s11738-001-0036-7

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