【摘要】 以银杏、金钱松为裸子植物的代表性实验材料对其ＰＳⅡ光合放氧及多肽组分进行了研究，和菠菜相比较，银杏、金钱松ＰＳⅡ放氧活性较低，分别为菠菜的１０％和３５％左右．对银杏、金钱松的ＰＳⅡ多肽组与分析发现，其多肽组分较复杂，和被子植物菠菜相比较，多肽数量多，且含有分子量为６５０００、６１０００、５２０００的大分子多肽．小分子多肽也存在一定的差异．更多还原

【Abstract】 We prepared PSⅡ particles from gymnosperm--Ginkgo and Pseudolarix. The preparation showed O 2-evolution activity of 11.7 and 38.60 O 2·μmol mg -1 Chl h -1 . The O 2-evolution activity were 10% and 35% that of Spinach PSⅡ particles respectively. Densitometer traces of SDS-PAGE indicated Ginkgo PSⅡ particles contained 11 polypeptides and Pseudolarix PSⅡ particles contained 9 polypeptides. The results demonstrated that the high-molecular weight polypeptides in gymnosperm (Ginkgo, Pseudolarix) PSⅡ particles were not found in angiosperm (Spinach) PSⅡ particles.更多还原