光呼吸
鲁比斯科
拟南芥
光合作用
固碳
生物
代谢途径
生物化学
植物
新陈代谢
基因
突变体
作者
Christoph Peterhänsel,Ina Horst,Markus Nießen,Christian Blume,Rashad Kebeish,Sophia Kürkcüoglu,Fritz Kreuzaler
出处
期刊:The Arabidopsis Book
[BioOne- American Society of Plant Biologists (Arabidopsis)]
日期:2010-01-01
卷期号:8: e0130-e0130
被引量:167
摘要
Photorespiration is initiated by the oxygenase activity of ribulose-1,5-bisphosphate-carboxylase/oxygenase (RUBISCO), the same enzyme that is also responsible for CO2 fixation in almost all photosynthetic organisms. Phosphoglycolate formed by oxygen fixation is recycled to the Calvin cycle intermediate phosphoglycerate in the photorespiratory pathway. This reaction cascade consumes energy and reducing equivalents and part of the afore fixed carbon is again released as CO2. Because of this, photorespiration was often viewed as a wasteful process. Here, we review the current knowledge on the components of the photorespiratory pathway that has been mainly achieved through genetic and biochemical studies in Arabidopsis. Based on this knowledge, the energy costs of photorespiration are calculated, but the numerous positive aspects that challenge the traditional view of photorespiration as a wasteful pathway are also discussed. An outline of possible alternative pathways beside the major pathway is provided. We summarize recent results about photorespiration in photosynthetic organisms expressing a carbon concentrating mechanism and the implications of these results for understanding Arabidopsis photorespiration. Finally, metabolic engineering approaches aiming to improve plant productivity by reducing photorespiratory losses are evaluated.
科研通智能强力驱动
Strongly Powered by AbleSci AI