Journal ArticleDOI
May photoinhibition be a consequence, rather than a cause, of limited plant productivity?
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TLDR
It is proposed that photoinhibited leaves characterized for foliar carbohydrate levels were invariably found to possess high levels of sugars and starch and should be placed in the context of whole-plant source–sink regulation of photosynthesis.Abstract:
Photoinhibition in leaves in response to high and/or excess light, consisting of a decrease in photosynthesis and/or photosynthetic efficiency, is frequently equated to photodamage and often invoked as being responsible for decreased plant growth and productivity. However, a review of the literature reveals that photoinhibited leaves characterized for foliar carbohydrate levels were invariably found to possess high levels of sugars and starch. We propose that photoinhibition should be placed in the context of whole-plant source–sink regulation of photosynthesis. Photoinhibition may represent downregulation of the photosynthetic apparatus in response to excess light when (1) more sugar is produced in leaves than can be utilized by the rest of the plant and/or (2) more light energy is harvested than can be utilized by the chloroplast for the fixation of carbon dioxide into sugars.read more
Citations
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Reactive oxygen species, oxidative signaling and the regulation of photosynthesis.
TL;DR: Reactive oxygen species (ROS) are produced in abundance by photosynthesis and function in redox signal transduction that is important in chloroplast to nucleus communication.
Journal ArticleDOI
Phytohormones regulate accumulation of osmolytes under abiotic stress.
Anket Sharma,Babar Shahzad,Vinod Kumar,Sukhmeen Kaur Kohli,Gagan Preet Singh Sidhu,Aditi Shreeya Bali,Neha Handa,Dhriti Kapoor,Renu Bhardwaj,Bingsong Zheng +9 more
TL;DR: The underlying mechanisms of phytohormone-regulated osmolyte accumulation along with their various functions in plants under stress conditions are discussed.
Journal ArticleDOI
Spreading the news: subcellular and organellar reactive oxygen species production and signalling
Lorin F. Mignolet-Spruyt,Enjun Xu,Niina Idänheimo,Frank A. Hoeberichts,Per Mühlenbock,Mikael Brosché,Frank Van Breusegem,Jaakko Kangasjärvi,Jaakko Kangasjärvi +8 more
TL;DR: Characterization of this comprehensive ROS signalling matrix may result in the identification of new targets and key regulators of ROS signalling, which might be excellent candidates for engineering or breeding stress-tolerant plants.
Journal ArticleDOI
Photosystem II photoinhibition-repair cycle protects Photosystem I from irreversible damage
TL;DR: It is proposed that regulation of PSII photoinhibition is the ultimate regulator of the photosynthetic electron transfer chain and provides a photoprotection mechanism against formation of reactive oxygen species and photodamage in PSI.
Journal ArticleDOI
Viewing oxidative stress through the lens of oxidative signalling rather than damage
TL;DR: Examining the multifaceted roles of ROS as crucial cellular signals, this work highlights as an example the loss of photosystem II function called photoinhibition, where photoprotection has classically been conflated with oxidative damage.
References
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Book
Physiological Plant Ecology
TL;DR: Life in the Solar System, and Beyond, and beyond, and In the Right Place at the Right Time.
Journal ArticleDOI
Photon yield of O2 evolution and chlorophyll fluorescence characteristics at 77 K among vascular plants of diverse origins.
Olle Björkman,Barbara Demmig +1 more
TL;DR: Determinations of the photon yield of O2 evolution and the Fv/FM, 692 ratio can serve as excellent quantitative measures of photoinhibition of overall photosynthetic energy-conversion system and of photochemistry of photosystem II, respectively.
Journal ArticleDOI
Photoinhibition of Photosynthesis in Nature
TL;DR: The author reveals the secrets of the prolific phytoplankton-farming success story, as well as some of the techniques used to achieve this success in the past.