ABSTRACT
Solar radiation is one of the most important factors required for the growth of cyanobacteria in their natural habitat. It is also the ultimate source of energy on Earth, as this energy is transformed into chemical energy generally by the photosynthetic organisms. Changes in the light intensity can be observed on broad timescale and over several orders of magnitude. For example, in terrestrial environments, short-term changes in the niche environment can occur because of shading due to cloud cover, whereas in the aquatic environment restriction of light can be caused by turbid water
14.1 Introduction ....................................................................................................................... 273 14.2 Perception and Transduction of Light ............................................................................... 274 14.3 Unsaturation of Fatty Acids in Light Stress ...................................................................... 276 14.4 DNA Damage and Repair ................................................................................................. 276 14.5 Protein Damage and Repair .............................................................................................. 278 14.6 Redox Sensors and Redox Homeostasis ........................................................................... 278 14.7 Heat Shock Proteins .......................................................................................................... 279 14.8 Effect of High Light Stress on Photosynthesis .................................................................280 14.9 Effect of Light Stress on Carbon Concentration Mechanism ........................................... 281 14.10 Does High Light Stress Induce Apoptosis? ...................................................................... 281 14.11 Comparative Analysis of Various Global High Light and UV Stress Studies .................. 282
14.11.1 Response to High Light Stress at the “Omics” Level in the Model Cyanobacterium Synechocystis sp. PCC 6803 .................................................. 282
14.11.2 Effect of High Light and High Light Supplemented with UV-B on Photosynthesis .............................................................................................. 283
14.11.3 Heat Shock Response ........................................................................................ 283 14.11.4 Redox Homeostasis ........................................................................................... 283 14.11.5 Other Common Factors Observed in High Light
and UV Stress in Cyanobacteria .......................................................................285 14.12 Conclusions .......................................................................................................................285 Acknowledgment ...........................................................................................................................285 References ......................................................................................................................................286
