Role of spermidine in the stabilization of the apoprotein of the light-harvesting chlorophyll a/b-protein complex of photosystem II during leaf senescence process |
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Authors: | Jolanta Legocka Irena Zajchert |
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Institution: | (1) Laboratory of Plant Physiology, Faculty of Biology, Adam Mickiewicz University, Al. Niepodległości 14, 61-713 Poznań |
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Abstract: | Barley leaf discs maintained in dark accumulated a massive amount of putrescine (Put), lost chlorophyll and senescenced rapidly.
At the same time RNase activity increased significantly. Exogenous spermidine (Spd) inhibited RNase activity, the loss of
chlorophyll and degradation of the proteins from thylakoid membranes. Using SDS-PAGE and immunoblot analysis it was shown
that spermidine was effective in the retardation of the loss of LHCPII observed in water-treated detached leaves. Analysis
of PSII particles isolated from leaf fragments floated in water in the dark revealed the presence of Put, Spd and Spm. In
spermidine treated leaves the level of this polyamine in photosystem II was above 5-fold higher than in control. The experimental
findings obtained in this study provide evidence that applied spermidine interacts directly with thylakoid membranes so that
they become more stable to degradation during senescence. |
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Keywords: | barley LHCPII photosystem II senescence spermidine thylakoid membrane proteins |
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