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Changes in chloroplast morphology of different parenchyma cells in leaves of Haberlea rhodopensis Friv. during desiccation and following rehydration |
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| Authors: | H Nagy-D??ri E R P??li K Georgieva Z Tuba |
| Institution: | 1. Plant Ecology Research Group of Hungarian Academy of Sciences, Institute of Botany and Ecophysiology, Szent Istv??n University, P??ter K. Str. 1, H-2103, G?d?ll?, Hungary 2. Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, Sofia, 1113, Bulgaria 3. Institute of Botany and Ecophysiology, Faculty of Agricultural and Environmental Sciences, Szent Istv??n University, H-2103, G?d?ll?, P??ter K. Str. 1, Hungary |
| Abstract: | The size, shape, and number of chloroplasts in the palisade and spongy parenchyma layers of Haberlea rhodopensis leaves changed significantly during desiccation and following rehydration. The chloroplasts became smaller and more rounded during desiccation, and aggregated in the middle of the cell. The size and number of chloroplasts in the palisade parenchyma cells were higher than in spongy parenchyma. The good correlation observed between the size or number of chloroplasts and the cross-sectional area of mesophyll cells, the cross-sectional width of the leaf and its water content suggested that the palisade cells were more responsive to water availability than the spongy cells. Changes in chloroplast number during desiccation and rehydration process are characteristic features for desiccation-tolerant plants (especially in homoiochlorophyllous strategy). |
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