AI Article Synopsis
- Thylakoid membranes are essential for chloroplasts and cyanobacteria, playing a key role in their ability to perform photosynthesis.
- Dark-grown Synechocystis sp. PCC 6803 cells have minimal thylakoid membranes but maintain some photosynthetic components, such as phycobilisomes and photosystems.
- Upon exposure to light, these cells undergo "greening," leading to complete thylakoid membrane restoration and activation of photosynthetic processes within 24 hours, following an initial 6-8 hour delay.
Article Abstract
Thylakoid membranes are typical and essential features of both chloroplasts and cyanobacteria. While they are crucial for phototrophic growth of cyanobacterial cells, biogenesis of thylakoid membranes is not well understood yet. Dark-grown Synechocystis sp. PCC 6803 cells contain only rudimentary thylakoid membranes but still a relatively high amount of phycobilisomes, inactive photosystem II and active photosystem I centers. After shifting dark-grown Synechocystis sp. PCC 6803 cells into the light, "greening" of Synechocystis sp. PCC 6803 cells, i.e. thylakoid membrane formation and recovery of photosynthetic electron transport reactions, was monitored. Complete restoration of a typical thylakoid membrane system was observed within 24 hours after an initial lag phase of 6 to 8 hours. Furthermore, activation of photosystem II complexes and restoration of a functional photosynthetic electron transport chain appears to be linked to the biogenesis of organized thylakoid membrane pairs.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3793023 | PMC |
| http://dx.doi.org/10.1104/pp.113.224428 | DOI Listing |
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