Laboratoire de Physiologie Végétale et Biochimie, Université de Neuchâtel, Chantemerle 20, CH-2000, Neuchâtel, Switzerland.
Planta. 1982 Mar;154(1):70-5. doi: 10.1007/BF00385499.
Functional chloroplasts from photoheterotrophic Euglena gracilis can be isolated in isoosmotic gradients of 10-80% Percoll. The chloroplasts display rates of CO2 dependent O2 evolution and CO2 fixation of 30-50 μmol mg(-1) chlorophyll h(-1) or 25-35% of the net O2 evolution by the whole cells and appear to be strikingly different from spinach chloroplasts in several respects: 1. tolerance to high concentration of orthophosphate in the assay medium; 2. inability to support oxaloacetate-dependent O2 evolution; 3. ability to support only low to moderate rates of 3-phosphoglycerate-dependent O2 evolution; 4. an apparent absence of a phosphate translocator in the terms described by Heldt and Rapley ([1970] FEBS Lett. 10, 143-148).
从光异养性衣藻中可以分离到功能正常的叶绿体,其分离方法是在 10-80%Percoll 的等渗透压梯度中。这些叶绿体显示出依赖 CO2 的 O2 释放和 CO2 固定的速率为 30-50 μmol mg(-1)叶绿素 h(-1)或整个细胞净 O2 释放的 25-35%,并且在几个方面与菠菜叶绿体明显不同:1. 能够耐受测定介质中高浓度的正磷酸盐;2. 不能支持草酰乙酸依赖的 O2 释放;3. 只能支持低至中等速率的 3-磷酸甘油酸依赖的 O2 释放;4. 在赫尔特和雷普利([1970]FEBS Lett. 10, 143-148)所述的条件下,明显缺乏磷酸转运蛋白。