Recent Posts

Chlamydomonas keeps the rhythm going

By Patrice Salomé, Department of Chemistry and Biochemistry, UCLA, Los Angeles, CA  Salomé and Merchant analyze hundreds of RNA-seq samples in the single-cell green alga and discover vast co-expression potential and surprising residual synchronized expression across samples derived from cultures…

A molecular timescale for eukaryote evolution with implications for the origin of red algal-derived plastids (Nature Comms)

Algae powered by red algal-derived plastids (e.g., diatoms, dinoflagellates, and coccolithophores) are among the most evolutionary and ecologically successful eukaryotes on Earth, but their origins and relationships remain poorly understood. Here, Strassert et al. test the rhodoplex hypothesis that designates…

Bundle sheath suberisation is required for C4 photosynthesis in a Setaria viridis mutant (Nature Comms)

An efficient C4 photosynthetic pathway relies on the coordination between the biochemical carbon concentration mechanism that secures high rates of C4 acid flow into the bundle sheath (BS) and anatomical modifications that minimize CO2 leakage out of the BS cells. Suberin deposition in BS cell walls…

A Light-Adapted Charge-Separated State for PSII

Sipka and coworkers show that the closed state of photosystem II holds a formerly unrecognized structural and functional plasticity and upon illumination assumes a light-adapted charge-separated state. [Plant Cell https://academic.oup.com/plcell/advance-article/doi/10.1093/plcell/koab008/6119330] By…

How Blue and Red Light Synergistically Drive Stomatal Opening

Hosotani et al. explore the molecular mechanisms that modulate stomatal opening under different light conditions. by Sakurako Hosotani and Atsushi Takemiya (Yamaguchi University)  Background: Opening of stomatal pores is essential for photosynthetic CO2 fixation and transpiration in terrestrial…

Review: Perspectives on improving light distribution and light use efficiency in crop canopies (Plant Physiol)

Light comes largely from above, and plants have evolved strategies to efficiently capture this light even when competing with other potentially shading plants. However, at a field-level, such competition may (and does) prevent plants from collectively maximizing light use efficiency, hence yield. In…

CO2 diffusion in tobacco: a link between mesophyll conductance and leaf anatomy (Interface Focus)

Three key factors affect a plant’s ability to fix carbon: enzymatic activity of Rubisco, stomatal conductance, and the journey from sub-stomatal cavity to Rubisco, also known as mesophyll conductance (gm). This latter is the focus of this new work by Clarke et al. They delightfully compare this journey…

Redox regulation of NADP-malate dehydrogenase is vital under fluctuating light environment (PNAS)

Redox switches regulate photosynthetic reactions and are mediated by conserved cysteine pairs, activated by reduction under light and deactivated by oxidation in the dark. Those reactions are mediated by thioredoxins (Trx). Usually, only plastidic and not cytosolic isozymes show these redox switches.…

Crosstalk Between Light Harvesting and Photoprotection Is Mediated by a Regulatory sRNA

Zhan and Steglich et al. investigate the small RNA-mediated regulation of the photoprotective Orange Carotenoid Protein in cyanobacteria. https://bit.ly/3d3AqY0 By Jiao Zhan1,2, Wolfgang Hess3 and Diana Kirilovsky1 1 Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the…