אסיף מאגר המחקר החקלאי

Protection of the photosynthetic apparatus against dehydration stress in the resurrection plant Craterostigma pumilum

Year:

2016

Source of publication :

Authors :

Volume :

87

Co-Authors:

Zia, A., Institute of Biological Chemistry, Washington State University, Pullman, WA, United States, Affiliated Colleges of Hafr Al-Batin, King Fahd University of Petroleum & Minerals, Hafr Al-Batin, Saudi Arabia
Walker, B.J., School of Biological Sciences, Molecular Plant Sciences, Washington State University, Pullman, WA, United States, Plant Biochemistry, Heinrich-Heine-University, Düsseldorf, Germany
Oung, H.M.O., Institute of Biological Chemistry, Washington State University, Pullman, WA, United States
Charuvi, D., Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, Israel, Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, Bet-Dagan, Israel
Jahns, P., Plant Biochemistry, Heinrich-Heine University Düsseldorf, Düsseldorf, Germany
Cousins, A.B., School of Biological Sciences, Molecular Plant Sciences, Washington State University, Pullman, WA, United States
Farrant, J.M., Department of Molecular and Cell Biology, University of Cape Town, Private Bag X3, Rondebosch, South Africa
Reich, Z., Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, Israel
Kirchhoff, H., Institute of Biological Chemistry, Washington State University, Pullman, WA, United States
Zia, A., Institute of Biological Chemistry Washington State University Pullman 99164-6340WA USA, Affiliated Colleges of Hafr Al-Batin King Fahd University of Petroleum and Minerals Hafr Al-Batin Saudi Arabia
Walker, B.J., School of Biological Sciences, Molecular Plant Sciences Washington State University Pullman 99164-4236WA USA, Plant Biochemistry Heinrich-Heine-University Düsseldorf 40225 Germany
Oung, H.M.O., Institute of Biological Chemistry Washington State University Pullman 99164-6340WA USA
Charuvi, D., Department of Biological Chemistry Weizmann Institute of Science Rehovot 76100 Israel, Institute of Plant Sciences Agricultural Research Organization Volcani Center Bet-Dagan 50250 Israel
Jahns, P., Plant Biochemistry Heinrich-Heine University Düsseldorf Düsseldorf 40225 Germany
Cousins, A.B., School of Biological Sciences, Molecular Plant Sciences Washington State University Pullman 99164-4236WA USA
Farrant, J.M., Department of Molecular and Cell Biology University of Cape Town Private Bag X3 Rondebosch 7701 South Africa
Reich, Z., Department of Biological Chemistry Weizmann Institute of Science Rehovot 76100 Israel
Kirchhoff, H., Institute of Biological Chemistry Washington State University Pullman 99164-6340WA USA

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Abstract:

The group of homoiochlorophyllous resurrection plants evolved the unique capability to survive severe drought stress without dismantling the photosynthetic machinery. This implies that they developed efficient strategies to protect the leaves from reactive oxygen species (ROS) generated by photosynthetic side reactions. These strategies, however, are poorly understood. Here, we performed a detailed study of the photosynthetic machinery in the homoiochlorophyllous resurrection plant Craterostigma pumilum during dehydration and upon recovery from desiccation. During dehydration and rehydration, C. pumilum deactivates and activates partial components of the photosynthetic machinery in a specific order, allowing for coordinated shutdown and subsequent reinstatement of photosynthesis. Early responses to dehydration are the closure of stomata and activation of electron transfer to oxygen accompanied by inactivation of the cytochrome b6f complex leading to attenuation of the photosynthetic linear electron flux (LEF). The decline in LEF is paralleled by a gradual increase in cyclic electron transport to maintain ATP production. At low water contents, inactivation and supramolecular reorganization of photosystem II becomes apparent, accompanied by functional detachment of light-harvesting complexes and interrupted access to plastoquinone. This well-ordered sequence of alterations in the photosynthetic thylakoid membranes helps prepare the plant for the desiccated state and minimize ROS production. © 2016 The Authors The Plant Journal © 2016 John Wiley & Sons Ltd

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