Photosynthetic Processes and Mechanisms

Going Against the Grain: Investigating the C4 Wheat Hypothesis with Spatial Transcriptomics

The paper uses spatial transcriptomics to investigate the spatial expression of C4 photosynthesis-related genes in wheat grain, finding tissue-specific expression patterns that support the C4 wheat hypothesis.

The Recombination Triplet State in the Far-Red Light Adapted Photosystem II is Located at the ChlD1 Site and Resides on the Red-Most Chlorophyll of the Reaction Center.

The paper identifies the recombination triplet state in far-red adapted PSII as located at the ChlD1 site, demonstrating its role in primary photochemistry.

Mitochondria affect photosynthesis through altered tissue levels of oxygen

The paper investigates how mitochondrial function affects photosynthesis by altering tissue oxygen levels in Arabidopsis, showing that increased mitochondrial oxygen consumption reduces chloroplast oxygen availability.

Organellar-specific ROS dynamics drive differential cross-compartmental responses between chloroplast and mitochondria in C. reinhardtii

This study investigates how ROS dynamics in chloroplasts and mitochondria of C. reinhardtii affect each other during compartmentalized oxidative stress.

Thylakoids reorganization enables driving photosynthesis under far-red light in the microalga Nannochloropsis gaditana

This study identifies a novel acclimation mechanism in Nannochloropsis gaditana that enables growth under far-red light through chloroplast reorganization rather than pigment synthesis.

The structure of phycobilisome with a bicylindrical core from the cyanobacterium Synechococcus elongatus PCC 7942

This paper reports the cryo-EM structure of a phycobilisome with a bicylindrical core from Synechococcus elongatus PCC 7942, revealing structural adaptations that maintain stability and energy transfer efficiency.

Oxylipin carbonyl composition in the chloroplast compartments

This study identifies and maps oxylipin carbonyl species within chloroplast compartments of spinach, revealing their sub-organellar distribution and potential roles in plant stress responses.

CLPC2 plays specific roles in CLP complex-mediated regulation of growth, photosynthesis, embryogenesis and response to growth-promoting microbial compounds

The small protein SbtC is a functional component of the CO2 concentrating mechanism of cyanobacteria

The paper identifies SbtC as a small protein involved in the cyanobacterial CO2 concentrating mechanism, showing it forms a trimeric complex with SbtA and SbtB to regulate bicarbonate exchange.

Cytosolic MAPK signaling gates chloroplast protein import and photosynthetic capacity

This study identifies a MAPK signaling pathway that regulates chloroplast protein import by modulating RbcS transit peptide phosphorylation, affecting photosynthetic capacity.

Continuous chlorophyll fluorescence measurements trace sudden cold spell effects on photosynthetic efficiency in a temperate mixed forest

This study uses continuous chlorophyll fluorescence and carbon flux measurements to analyze how cold spells affect photosynthetic efficiency in a temperate mixed forest, showing species-specific responses.

LCI9 is required for normal pyrenoid starch sheath formation and efficiency of the CO2-concentrating mechanism in Chlamydomonas reinhardtii

This study investigates the role of LCI9 in starch sheath formation and CO2-concentrating mechanism efficiency in Chlamydomonas reinhardtii, finding that LCI9 is essential for proper sheath assembly and pCCM function.

Rubisco is slow across the tree of life

The paper characterizes over 250 Rubisco variants from bacteria and archaea, showing they rarely exceed 30 reactions per second at 30°C and predicting rates for all sequenced variants using machine learning.

Redistribution of excitation energy between two photosystems during light-shade adaptation in marine diatoms: State conversion of light-harvesting complexes

This study shows that marine diatoms redistribute excitation energy between photosystems I and II under different light conditions, using distinct strategies in two species.

Molecular insights into phycobilisome assembly pathway reveal crystalline bodies in cyanobacteria

The paper investigates PBS assembly in cyanobacteria by knocking out apcE, revealing crystalline bodies as intermediates in the process.

The last one in the row but decisive: PPDK as a potential key regulator of diurnal deacidification in CAM leaves across varying PPFD and photoperiod conditions

This study identifies PPDK as a key regulator of light-dependent diurnal deacidification in CAM leaves, showing its strict light regulation across varying PPFD and photoperiod conditions.

The EGY1-SGR1 module controls chloroplast development and senescence by modulating photosynthetic functions

This study identifies EGY1 and SGR1 as regulators of chloroplast development and senescence by modulating chlorophyll metabolism and photosynthetic functions.

Daily Heat Stress Induces Accumulation of Non-functional PSII-LHCII and Donor-side Limitation of PSI via Downregulation of the Cyt bf Complex

This study shows that prolonged heat stress in Arabidopsis thaliana reduces cytochrome b6f complex content, leading to donor-side limitation of PSI and lower carbon assimilation.

Guanosine tetraphosphate (ppGpp) promotes tolerance to 2 excess light in Arabidopsis thaliana.

This study shows that ppGpp over-accumulation in Arabidopsis thaliana increases tolerance to excess light through physiological changes, not NPQ.

Diversity-driven biochemical survey reveals dimeric structural origin of rubisco

The paper characterizes the structural and functional diversity of rubisco by synthesizing and analyzing diverse sequences, revealing a dimeric origin and a novel large rubisco structure.

Synthesis of C8-vinyl chlorophylls d and f impairs far-red light photoacclimation and growth under far-red light

This study shows that disrupting the BciB gene in cyanobacteria leads to impaired far-red light photoacclimation and growth under far-red light due to altered chlorophyll synthesis.

HDA6 regulates chloroplast biogenesis and photosynthesis in Arabidopsis through deacetylation of non-histone proteins

This study identifies HDA6 as an epigenetic regulator that controls chloroplast biogenesis and photosynthesis in Arabidopsis by deacetylating non-histone proteins.

Proteomic analysis of the pyrenoid-traversing membranes of Chlamydomonas reinhardtii reveals novel components

The paper identifies protein components of pyrenoid-traversing membranes in Chlamydomonas reinhardtii using affinity purification and mass spectrometry, and characterizes two novel proteins involved in this structure.

In-situ Observation of Fast Chloroplast Dynamics in Intact Leaves

This study uses NIR-II fluorescence confocal microscopy to observe fast chloroplast dynamics in intact leaves, revealing rapid avoidance responses in submerged leaves to red light.

Structure and quenching of a bundle-shaped phycobilisome

This paper presents the cryo-EM structure of the Gloeobacter violaceus phycobilisome, revealing its unique bundle-shaped architecture and regulation by orange carotenoid proteins.

The first photosynthetic mutant in diatoms targets the subunit γ of plastidial ATP synthase and reveals a key role of thylakoid electrochemical proton gradient in photosynthesis regulation and heterotrophic metabolism.

Proteomic responses under differing pH and pCO2 levels in the diatom Thalassiosira pseudonana are consistent with a hybrid carbon concentrating mechanism

The paper uses proteomic analysis to identify a hybrid carbon concentrating mechanism in the diatom Thalassiosira pseudonana under varying pH and pCO2 conditions.

Metabolite profiling reveals slow and uncoordinated adjustment of C4 photosynthesis to sudden changes in irradiance

This study profiles metabolites in maize under sudden irradiance changes, revealing slow metabolic adjustments and inefficiencies in photosynthesis.

Locating the Missing Chlorophylls f in Far-red Photosystem I

The paper reports a cryo-EM structure of far-red Photosystem I from Chroococcidiopsis thermalis, revealing all eight chlorophylls f and their functional roles in photochemistry.

Convergence, stability, and thermal adaptation in the rubisco enzyme in plants

The paper examines RbcL evolution in four plant clades, finding positive selection and convergent substitutions, with stability linked to temperature but weakened after phylogenetic correction.