Photosynthetica 1999, 36(14):529-535 | DOI: 10.1023/A:1007159105734

Interaction of Anions and Cations in Regulating Energy Distribution between the Two Photosystems

Anjana Jajoo1, Sudhakar Bharti1
1 School of Life Science, Vishwavidyalaya, Indore, India

Cations such as Mg2+ regulate spillover of absorbed excitation energy mainly in favour of photosystem (PS) 2. Effect of low concentration (<10 mM) of the monovalent cation Na+ on chlorophyll (Chl) a fluorescence was completely overridden by divalent cation Mg2+ (5 mM). Based on Chl a fluorescence yield and 77 K emission measurements, we revealed the role and effectiveness of anions (Cl-, SO42-, PO43-) in lowering the Mg2+-induced PS2 fluorescence. The higher the valency of the anion, the lesser was the expression of Mg2+ effect. Anions may thus overcome Mg2+ effects up to certain extent in a valency dependent manner, thereby diverting more energy to PS1 even in the presence of MgCl2. They may do so by reversing Mg2+-induced changes.

Additional key words: chlorophyll fluorescence induction; MgCl2; NaCl; Na2HPO4; Na2PO4; Na2SO4; spinach; Spinacia oleracea; state change; thylakoids

Prepublished online: December 1, 2000; Published: December 31, 1999  Show citation

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Jajoo, A., & Bharti, S. (1999). Interaction of Anions and Cations in Regulating Energy Distribution between the Two Photosystems. Photosynthetica, 37(4), 529-535. doi: 10.1023/A:1007159105734
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