【摘要】 ＰＳⅡ反应中心Ｄ１／Ｄ２／Ｃｙｔｂ５５９ 复合物的圆二色（ＣＤ）光谱在红区有一个反向带，其正峰在６８０ ｎｍ ，负峰在６６０ ｎｍ 处。光破坏后，该反应中心复合物的ＣＤ信号明显下降，而且当正峰完全消失后，负峰仍然存在，说明该反应中心的ＣＤ信号不仅来源于原初电子供体Ｐ６８０，而且可能来源于其它色素分子更多还原

【Abstract】 The CD spectrum of photosystemⅡ reaction center D1/D2/Cyt b559 complex showed a strong reverse band with positive peak at 680 nm and negative peak at 660 nm in the red absorption region (Qy band).After the D1/D2/Cyt b559 complex was illuminated by strong light, the CD signals of the complex decreased significantly in the red region in which the negative peak still existed but the positive one disappeared.The result suggested that the CD signal of photosystemⅡ reaction center D1/D2/Cyt b559 complex not only came from the primary donor, P680, but also from other pigments such as from accessory Chl a or Pheo a.更多还原