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Plant and Cell Physiology, 2001, Vol. 42, No. 10 1186-1191
© 2001 Oxford University Press

Osmotic Stress Induces Inactivation of Photosynthesis in Guard Cell Protoplasts of Vicia Leaves

Chang-Hyo Goh1,3, Rainer Hedrich2 and Ulrich Schreiber2

1 Division of Molecular and Life Science, Pohang University of Science and Technology, San 31, Nam-Gu, Hyoja-Dong, Pohang, Kyungbuk, 790-784 Korea 2 Lehrstuhl für Molekulare Pflanzenphysiologie und Biophysik, Julius-von-Sachs Institut, Universität Würzburg, Julius-von-Sachs Platz 2, D-97082 Würzburg, Germany

Guard cell protoplasts isolated from Vicia leaves showed a strong suppression of the photosynthesis under hypotonic conditions, as reflected by changes in the chlorophyll fluorescence characteristics. The response was reversible as well. Mesophyll cell protoplasts did not show any lowering of photosynthetic activity under hypo-osmotic conditions. This result indicates that the response was guard cell specific.

3 Corresponding author: E-mail, gohunse@postech.ac.kr; Fax: +82-54-279-2199.


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