水分胁迫对小麦叶绿体色素蛋白复合体的影响

水分胁迫可抑制激发能向ＰＳⅡ传递,降低ＰＳⅡ捕光色素蛋白复合体、ＰＳⅡ内周天线色素蛋白复合体以及ＰＳⅠ捕光色素蛋白复合体和ＰＳⅠ反应中心叶绿素ａ 蛋白复合体的含量,其中以ＰＳⅡ色素蛋白复合体含量下降幅度较大。类囊体膜多肽分析表明,水分胁迫使属于ＰＳⅡ捕光色素蛋白复合体的２５ ｋＤ蛋白、ＰＳⅡ内周天线色素蛋白复合体的４３ ｋＤ 和４７ ｋＤ蛋白以及ＰＳⅠ捕光色素蛋白复合体的２１ ｋＤ蛋白含量降低,尤以２５ ｋＤ蛋白含量降幅最大。     

CATALYTIC EFFECTS OF CARBON DIOXIDE IN CARBON DIOXIDE ASSIMILATING CELLS

It has been confirmed that absence of carbon dioxide may decreasethe rate of oxygen production which accompanies the photochemicalreduction of p-benzoquinone in algae and chloroplasts. Thisinfluence of carbon dioxide partial pressure does not applyto the overall oxygen yield. In the blue-green alga Anacystisnidulans the initially small carbon dioxide deficiency effectincreases with time spent in the dark. The deterioration ofreaction rates is counteracted by light. There seems to be nodirect connection or interdependence between the photosyntheticreduction of carbon dioxide and the sensitivity of some partof the photochemical mechanism to loss of carbon dioxide. Notonly does addition of quinone to living cells in these experimentsdestroy their capacity for photosynthesis, but mutant cellsthat never had this capacity still retain the sensitivity towardslack of carbon dioxide when tested for their ability to reducequinone. Many different metabolic reactions have been seen topossess such dependency on traces of carbon dioxide, also innon-photosynthetic cells and tissues. The explanation for "catalytic"effects of carbon dioxide ought to be a general one–suchas an influence on the efficiency of certain phosphorylationswhich occur everywhere in the living world. ¹ Dedicated to Prof. H. TAMIYA on the occasion of his 60th birthday.These studies were aided by contract NONR 988 (10) between theOffice of Naval Research, Department of the Navy, and the FloridaState University, respectively. ² Present address: Charles F. KETTERING Research Laboratories,Yellow Springs, Ohio. (Received December 7, 1962; )