J Integr Plant Biol ›› 1995, Vol. 37 ›› Issue (11): -.

• Research Articles •    

Mechanism of Change in the Cation-Induced Excitation Energy Distribution Between PSⅡ and PS Ⅰ in the Chloroplast Membrane from Zostera marina

Gao Zhen-pan, Ma Hong, Lou Qing-xiang, Zhai Xiao-jing, Ma Gui-zhi, Mao Da-zhang and Li Liang-bi   

Abstract: The interrelations between thylakoid polypeptide components and Mg2+-induced Chl a fluorescence and thylakoid surface charge changes were investigated in Zostera marina chloroplasts treated with Ca2+ and trypsin. It was observed that: 1. The increase of Mg2+- induced PS Ⅱ fluorescence intensity was closely related to the decrease of Mg2+-induced surface charge density of the thylakoid membrane in the normal chloroplast; 2. Removal of the 32~34 kD polypeptides of the thylakoid surface by Ca2+ extraction of the chloroplast did not affect the Mg2+-induced phenomena; 3. If the Ca2+-treated chloroplast was further digested by trypsin to remove the 26 kD polypeptide of the membrane surface, the Mg2+-induced phenomena disappeared completely. These results clearly indicated that the 26 kD polypeptide of thylakoid surface is the specific acting site of the cation that induced these two correlated phenomena in the chloroplast from Zostera marina. The mechanism on the regulating effect of the cation on excitation energy distribution between PS Ⅱ and PS Ⅰ was discussed.

Key words: Chloroplast, Photosystem, Excitation energy distribution

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