Ecological Significance of the Interaction of Photosynthesis Light and Dark Processes  

作　　者：V. I. Chikov G. A. Akhtyamova L. A. Khamidullina V. I. Chikov;G. A. Akhtyamova;L. A. Khamidullina(Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Kazan, Russia)

机构地区：[1]Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Kazan, Russia

出　　处：《American Journal of Plant Sciences》2021年第4期624-634,共11页美国植物学期刊（英文）

摘　　要：The kinetics of </span>^{<span style="font-family:Verdana;">14</span>}<span style="font-family:Verdana;">C incorporation into glycolate was studied after changing the export of photosynthetic products from the leaf. It has been shown that the </span><span style="font-family:Verdana;">ribulose-bisphosphate-oxygenase pathway of glycolate formation works in</span><span style="font-family:Verdana;"> the stationary state of the plant. An excess of photosyntates or a decrease in the amount of light primary products, as well as nitrates in the leaves, immediately turns on the transketolase pathway of glycolate formation. In this case, </span><span style="font-family:Verdana;">part of the oxygen formed in the photochemical reactions of chloroplasts</span><span style="font-family:Verdana;"> ceases to be released from the leaf. After oxygen receives an electron from ferredoxin in the electron transport chain of chloroplasts, it starts (through photorespiration) the formation of non-carbohydrate photosyntates and metabolic processes in the cytoplasm. It was concluded that the main function of pho</span><span style="font-family:Verdana;">torespiration in the regulation of photosynthesis is maintaining a balance</span><span style="font-family:Verdana;"> between light and dark processes of photosynthesis on change of living conditions.The kinetics of </span>^{<span style="font-family:Verdana;">14</span>}<span style="font-family:Verdana;">C incorporation into glycolate was studied after changing the export of photosynthetic products from the leaf. It has been shown that the </span><span style="font-family:Verdana;">ribulose-bisphosphate-oxygenase pathway of glycolate formation works in</span><span style="font-family:Verdana;"> the stationary state of the plant. An excess of photosyntates or a decrease in the amount of light primary products, as well as nitrates in the leaves, immediately turns on the transketolase pathway of glycolate formation. In this case, </span><span style="font-family:Verdana;">part of the oxygen formed in the photochemical reactions of chloroplasts</span><span style="font-family:Verdana;"> ceases to be released from the leaf. After oxygen receives an electron from ferredoxin in the electron transport chain of chloroplasts, it starts (through photorespiration) the formation of non-carbohydrate photosyntates and metabolic processes in the cytoplasm. It was concluded that the main function of pho</span><span style="font-family:Verdana;">torespiration in the regulation of photosynthesis is maintaining a balance</span><span style="font-family:Verdana;"> between light and dark processes of photosynthesis on change of living conditions.

关 键 词：Assimilate Transport APOPLAST STOMATA INVERTASE CHLOROPLAST 

分 类 号：O17[理学—数学]