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- W2073566346 abstract "The three major polyamines are normally found in chloroplasts of higher plants and are implicated in plant growth and stress response. We have recently shown that putrescine can increase light energy utilization through stimulation of photophosphorylation [Ioannidis et al., (2006) BBA-Bioenergetics, 1757, 821-828]. We are now to compare the role of the three major polyamines in terms of chloroplast bioenergetics. There is a different mode of action between the diamine putrescine and the higher polyamines (spermidine and spermine). Putrescine is an efficient stimulator of ATP synthesis, better than spermidine and spermine in terms of maximal % stimulation. On the other hand, spermidine and spermine are efficient stimulators of non-photochemical quenching. Spermidine and spermine at high concentrations are efficient uncouplers of photophosphorylation. In addition, the higher the polycationic character of the amine being used, the higher was the effectiveness in PSII efficiency restoration, as well as stacking of low salt thylakoids. Spermine with 50 microM increase F(V) as efficiently as 100 microM of spermidine or 1000 microM of putrescine or 1000 microM of Mg(2+). It is also demonstrated that the increase in F(V) derives mainly from the contribution of PSIIalpha centers. These results underline the importance of chloroplastic polyamines in the functionality of the photosynthetic membrane." @default.
- W2073566346 created "2016-06-24" @default.
- W2073566346 creator A5060113627 @default.
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- W2073566346 date "2007-12-01" @default.
- W2073566346 modified "2023-09-27" @default.
- W2073566346 title "Effects of polyamines on the functionality of photosynthetic membrane in vivo and in vitro" @default.
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- W2073566346 doi "https://doi.org/10.1016/j.bbabio.2007.10.002" @default.
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