2019/01/10 by Anja Krieger‐Liszkay, Karin Krupinska, Ginga Shimakawa · 89 citations
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · #Biochemistry #Biology #Botany #Cell biology #Chloroplast #Gene #Photosynthesis #Photosynthetic Processes and Mechanisms #Plant Gene Expression Analysis #Plant Stress Responses and Tolerance #Reactive oxygen species #Senescence
paper · open access · doi:10.1111/ppl.12921
published in Physiologia Plantarum 166(1), 148-164 (Wiley)
openalex publication_date 2019/01/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Senescence is the last stage of leaf development preceding the death of the organ, and it is important for nutrient remobilization and for feeding sink tissues. There are many reports on leaf senescence, but the mechanisms initiating leaf senescence are still poorly understood. Leaf senescence is affected by many environmental factors and seems to vary in different species and even varieties of plants, which makes it difficult to generalize the mechanism. Here, we give an overview on studies reporting about alterations in the composition of the photosynthetic electron transport chain in chloroplasts during senescence. We hypothesize that alternative electron flow and related generation of the proton motive force required for ATP synthesis become increasingly important during progression of senescence. We address the generation of reactive oxygen species (ROS) in chloroplasts in the initiation of senescence, retrograde signaling from the chloroplast to the nucleus and ROS-dependent signaling associated with leaf senescence. Finally, a few ideas for increasing crop yields by increasing the chloroplast lifespan are presented.