Abstract
Potassium pyroantimonate precipitation, transmission electron microscopy, and X-ray microanalysis were used to investigate the subcellular localization of loosely bound calcium in Robinia pseudoacacia pulvinar motor cells during phytochrome-mediated nyctinastic closure. Calcium localization was carried out in pulvini collected in white light 2 h after the beginning of the photoperiod, immediately after a red light or a far-red light pulse applied 2 h after the beginning of the photoperiod and after 15 or 25 min of darkness respectively. Calcium antimonate precipitates were found in all the pulvinar tissues from the epidermis to the vascular bundle, independent of the light treatment. At subcellular level, precipitates were found mainly in the intercellular spaces, the inner surface of the plasma membrane, cytoplasm, colloidal vacuoles, and nuclei. Red light enhanced the nyctinastic closure of leaflets and caused an asymmetric distribution of cytosolic calcium precipitates between the extensor and flexor motor cells. Both the number and area of the cytosolic calcium precipitates drastically increased in the extensor cells compared to the flexor motor cells. Red light had a rapid and transient effect on the distribution of cytosolic calcium precipitates, which occurred during or at the end of the irradiation, before leaflet closure. By contrast, the distribution of cytosolic loosely bound calcium was similar between the extensor and flexor motor cells after irradiation with far-red light. Our results demonstrate that red light causes specific calcium mobilization in pulvinar motor cells and suggest the involvement of cytoplasmic Ca2+ as a second messenger for phytochrome during nyctinastic closure.
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Acknowledgements
We would like to thank the Experimental Fields Service and the Transmission Electron Microscopy Unit of the Scientific and Technological Centers (CCITUB) at the University of Barcelona for their valuable technical assistance. Thanks to P. Rovira and M. Pinto for their assistance in the preparation of the figures and Michael Maudsley (Language Services, University of Barcelona) for correcting the English text.
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This work was supported by a research project (CGL2011-26310) from the Ministry of Science and Innovation, Spain.
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Supplementary Figure 1
Comparison of fixative procedures in extensor cortical motor cells of R. pseudoacacia secondary pulvini fixed in: (a) 2.5% GA, 2% PFA and 2% OsO4; (b) 2.5% GA, 2% PFA, 1% PH and 2% OsO4; (c) 2.5% GA and 2% PFA; and (d) 2.5% GA, 2% PFA and 1% PH. In (a - d) note the absence of calcium antimonate precipitates. In (a) and (b) the integrity of the plasma membrane, tonoplast, chloroplast envelope and thylakoid membranes is preserved, but in (c) poor preservation of the chloroplast membranes is evident. In (d) increased electron density of cell wall and chloroplasts and preservation of the tissue were more satisfactory than in c. Legends as in Fig. 3, 4 and 5. Thin arrow and arrowhead indicate plasma membrane and tonoplast respectively. Scale bar: (a – d) 0.5 μm (JPG 1858 kb)
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Moysset, L., Llambrich, E. & Simón, E. Calcium changes in Robinia pseudoacacia pulvinar motor cells during nyctinastic closure mediated by phytochromes. Protoplasma 256, 615–629 (2019). https://doi.org/10.1007/s00709-018-1323-0
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DOI: https://doi.org/10.1007/s00709-018-1323-0