J Integr Plant Biol. ›› 1996, Vol. 38 ›› Issue (3): -.

• Research Articles •    

Studies on the Energy Transfer from Phycobilisome to Thylakoid Membrane of Cyanobacteria

Zhao Dong-xu, Rong Shou-yu and Fang Zhao-xi   

Abstract: Ultrasonic treatment has been introduced to obtain photosynthetic vesicles with hound phycobilisome (PBS). the PBS-thylakoid fraction, from Myxosarcina concinna Printz. The maximal oxygen evolving rate of PBS-thylakoid membrane was around 60 μmol O2/ (mg Chl.h) and the optimum temperature was about 34 ℃. Absorption peaks of the eomplex were located at 680, 628, 490, 438 and 420 nm. When the phyeobiliprotein of the complex was excited by light at 580 nm, the fluorescence emission spectrum at room temperature exhibited a peak at 660 nm and a shoulder at 680 nm, while at liquid nitrogen temperature the peaks were resolved to 664, 695 and 718 nm, The PBS bound with thylakoid membrane depolymerized and the energy transfer from PBS to thylakoid membrane decreased when the complex was put into a solution of low ion intensity. As the PBS was mixed with the PBS desociated thylakoid membrane, by contact with the thylakoid membrane the PBS could again transfer the energy trapped in itself to thylakoid membrane.

Key words: Cyanobacteria, Phycobilisome, Thylakoid, Energy transfer

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