Recent Posts

A direct connection between PSI & PSII systems in green plants (Plant Cell Physiol)

Plants often optimize their development according to the prevailing environmental conditions, of which light is one of the most important. Arabidopsis uses a PSI-PSII megacomplex as the photosystem reaction center, to transfer the excessive energy from PSII to PSI rapidly. Recently, Yokono et al. proposed…

Balancing photosystem activities: different mechanisms in plants and cyanobacteria

Calzadilla et al. investigate the mechanism underlying state transitions in cyanobacteria. Plant Cell https://doi.org/10.1105/tpc.18.00159 By Pablo I. Calzadilla and Diana Kirilovsky, Institute for Integrative Biology of the Cell, CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Gif sur…

Review. Feeding the world: improving photosynthetic efficiency for sustainable crop production (J Exp Bot)

The global population is estimated to rise by 2 billion by 2050 placing strains on major food crops. To sustainably feed future populations and reduce the environmental damage of intensive agriculture, crop yields must be improved without increasing the amount of cultivatable land. In this review, Simkin…

What quantity of photosystem I is optimum for safe photosynthesis? ($) (Plant Physiol)

Photosynthesis is one of the most vital and complex processes carried out by plants. During photosynthesis, Photosystem I and II (PSI and PSII) undergo photo-excitation. Excessive photo-excitation can damage and deactivate the PSI by generating reactive oxygen species (ROS). This kind of photoinhibition…

Rubisco condensate formation by CcmM in β-carboxysome biogenesis (Nature) ($)

Cyanobacterial carbon-dioxide concentrating mechanisms elevate intracellular inorganic carbon as bicarbonate, and then concentrate it as carbon-dioxide around the enzyme Rubisco in specialized protein micro-compartments called carboxysomes. The formation of B-carboxysomes involves an aggregation between…

Synthetic glycolate metabolism pathways stimulate crop growth and productivity in the field ($) (Science)

Rubisco uses CO2 from the air to carboxylate its substrate RuBP, resulting in an increase in fixed carbon.  However, rubisco can also oxygenate RuBP and this leads to the production of glycolate. Plants must invest energy in recycling this toxic by-product in a process called photorespiration, resulting…

New Insights into Carboxysomes

Despite its essential role in photosynthetic carbon fixation, ribulose 1,5 bisphosphate carboxylase/oxygenase (Rubisco) is a relatively inefficient enzyme, due in part to its inability to discriminate between CO2 and O2 as substrates. To suppress the oxygenase reaction and enhance the carboxylase activity…

Reporter‐based screen to identify bundle sheath anatomy mutants ($) (Plant J)

Installation of C4 photosynthesis into C3 crops appears a realistic way to boost crop yields.  A key aspect of C4 photosynthesis is an enlarged bundle sheath volume and an increase in bundle sheath chloroplast number.  To identify the regulators of this phenotype, Döring et al. subjected Arabidopsis…

How Peroxisomes Modulate Chloroplast Activity in a Microalga

Background: Chloroplasts are the major powerhouse of plant and algal cells, where photosynthesis—the conversion of carbon dioxide into organic compounds using sunlight energy—occurs. Chloroplasts are also where important cell components (such as membrane lipids and pigments) and energy-rich compounds…