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Articles by Pushan Bag
Photosynthesis at the Edge: A Unifying Bioenergetic Framework for Extreme Environments
This version is not peer-reviewed. Submitted: 28 September 2026 Posted: 29 September 2026 You are already at the latest version Photosynthetic organisms inhabiting extreme environments - deserts, polar regions, geothermal springs, hypersaline lakes, deeply shaded understories and more - have evolved diverse strategies to maintain chloroplast energy balance under chronic environmental pressure.
From Photochemistry to Flux: Toward Quantitative Photosynthetic Bioenergetics
Submitted: 18 September 2026 Posted: 20 September 2026 You are already at the latest version Photosynthetic energy conversion requires continuous coordination between light-driven electron transport and downstream metabolic demand. Chlorophyll fluorescence, P700 spectroscopy and electrochromic-shift measurements have transformed our understanding of photosynthetic regulation by resolving PSII operating efficiency, excitation pressure, PSI redox poise and proton-motive-force dynamics.
Photosynthetic advantages of conifers in the boreal forest
Keywords conifers photosystems nonphotochemical quenching (NPQ) direct energy transfer alternative electron transport flavodiiron proteins Conifers retain chlorophyll in winter even when they cannot photosynthesise In nature, plants often face environmental fluctuations ranging from seconds (cloud covering) to months (seasonal changes) [1–3]. These environmental fluctuations, if ignored, can downregulate or damage photosynthesis and compromise plant growth.
ChloroSpec: A new in vivo chlorophyll fluorescence spectrometer for simultaneous wavelength‐ and time‐resolved detection
1 INTRODUCTION Chlorophyll (Chl) fluorescence, the light emitted from the key pigments of the photosynthetic apparatus has - since the first study of the phenomenon (Kautsky and Hirsch, 1931) - provided over the last few decades fundamental insights into the functioning of the photosynthetic apparatus of green organisms (Kalaji et al., 2014, Kalaji et al., 2017).
Alternatives to Styrene‐ and Diisobutylene‐based Copolymers for Membrane Protein Solubilization via Nanodisc Formation
Supporting Information As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors.
Salicylic acid metabolism and signalling coordinate senescence initiation in aspen in nature - Nature Communications
Author notes Pushan Bag Present address: Section of Molecular Plant Biology, Department of Biology, University of Oxford, Oxford, UK Authors and Affiliations Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90189, Umeå, Sweden Jenna Lihavainen, Pushan Bag, Nazeer Fataftah, Kathryn Megan Robinson & Stefan Jansson Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 901 83, Umeå, Sweden Jan Šimura,...
Flavodiiron-mediated O2 photoreduction at photosystem I acceptor-side provides photoprotection to conifer thylakoids in early spring - Nature Communications
Abstract Green organisms evolve oxygen (O2) via photosynthesis and consume it by respiration. Generally, net O2 consumption only becomes dominant when photosynthesis is suppressed at night. Here, we show that green thylakoid membranes of Scots pine (Pinus sylvestris L) and Norway spruce (Picea abies) needles display strong O2 consumption even in the presence of light when extremely low temperatures coincide with high solar irradiation during early spring (ES).
Distinctive mechanism of LHCSR3 expression and function under osmotic stress in Chlamydomonas reinhardtii
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Author Correction: Direct energy transfer from photosystem II to photosystem I confers winter sustainability in Scots Pine
Correction to: Nature Communications https://doi.org/10.1038/s41467-020-20137-9, published online 15 December 2020. The original version of this Article contained an error in Fig. 1g, h and l, in which the y axes were labelled ‘NPQ (1-Fm'/Fm)’. They should have been labelled ‘NPQ (Fm/Fm'-1)’. This has been corrected in the PDF and HTML versions of the Article.
Direct energy transfer from photosystem II to photosystem I confers winter sustainability in Scots Pine
Abstract Evergreen conifers in boreal forests can survive extremely cold (freezing) temperatures during long dark winter and fully recover during summer. A phenomenon called “sustained quenching” putatively provides photoprotection and enables their survival, but its precise molecular and physiological mechanisms are not understood.
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