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  • Title: Effects of Mg(2+)on spectral characteristics and photosynthetic functions of spinach photosystem II.
    Author: Liang C, Xiao W, Hao H, Xiaoqing L, Chao L, Lei Z, Fashui H.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2009 Mar; 72(2):343-7. PubMed ID: 19083263.
    Abstract:
    In the present paper we report the results obtained with the photosystem II (PSII) isolated from spinach treated by MgCl(2), and studied the effect of Mg(2+) on spectral characteristics and photosynthetic functions of PSII. The results showed that Mg(2+) treatment at a suitable concentration could significantly increase the absorption intensity of PSII and the intensity ratio of Soret band to Q band of chlorophyll-a. The treatment also elevated the excited peak intensity at 230, 278 and 343 nm, and the emitted peak intensity at 304 and 682 nm, and the ratio of F(278)/F(230), respectively. The results implied that Mg(2+) increased absorbance for visible light, improving energy transfer among amino acids within PSII protein complex and accelerating energy transport from tyrosine residue to chlorophyll-a. The photochemical activity and oxygen evolving rate of PSII were also enhanced by Mg(2+). This is viewed as evidence that Mg(2+) can promote energy transfer and oxygen evolution in PSII of spinach.
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