Entries by Mike Page

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 seeds to EMS mutagenesis, and employed a high-throughput […]

FACE facts hold for multiple generations; Evidence from natural CO2 springs (Global Change Biol)

Assessing the effect of rising CO2 concentrations on plant growth and physiology traits is crucial in order to determine how ecosystems and crop production systems will perform in future climates.  Such assessments have been made with free-air CO2 enrichment (FACE) experiments, which have provided a wealth of data on plant responses to changes in atmospheric […]

Increased temperatures may safeguard the nutritional quality of crops under future elevated CO2 concentrations (Plant J)

Increases in atmospheric CO2 have been shown to confer enhanced photosynthetic rates, boosting plant growth and yield.  Unfortunately, there is evidence that the content of minerals important for human health are reduced in both the foliar and edible tissues when plants are grown under elevated CO2 (eCO2).  However, future increases in atmospheric CO2 are likely […]

BSD2 is a Rubisco specific assembly chaperone, forms intermediary hetero‐oligomeric complexes and is non‐limiting to growth in tobacco (Plant Cell Environ)

The rubisco holoenzyme is comprised of eight large subunits and eight small subunits (L8S8).  Several auxiliary proteins are required to correctly assemble the functional protein. In this manuscript, Conlan et al investigate the chaperone function of one of these proteins, BSD2, in tobacco. The authors confirmed that in leaf tissue, BSD2 forms stable complexes with L8, which […]

Bundle sheath chloroplast volume can house sufficient Rubisco to avoid limiting C4 photosynthesis during chilling (J Exp Bot)

It has long been thought that C4 species generally perform less well than C3 species in cold environments as a consequence of a physical space restriction.  C3 species tend to accumulate more rubisco under chilling stress to avoid limiting photosynthesis, but there is less capacity for this in C4 species as rubisco is confined solely to bundle sheath cells […]

A thylakoid-located carbonic anhydrase regulates CO2 uptake in the cyanobacterium Synechocystis sp. PCC 6803 (New Phytol)

The cyanobacterial CO2 concentrating mechanism (CCM) is dependent on a continuous supply of inorganic carbon (Ci) to rubisco inside carboxysomes in order to function optimally.  CO2 uptake pathways are therefore of great importance for a full understanding of the cyanobacterial CCM.  Sun et al demonstrate that a thylakoid bound carbonic anhydrase (CA), EcaB, converts CO2 to bicarbonate (HCO3–) as […]

Roles of RbcX in carboxysome biosynthesis in the cyanobacterium Synechococcus elongates PCC 7942  (Plant Physiol)

Introduction of the cyanobacterial carboxysome into C3 crops represents a viable strategy to increase photosynthetic conversion efficiency and boost crop yield.  Key to this challenge is gaining a full understanding of the carboxysome system in cyanobacteria, including how these microcompartments assemble and function. In this manuscript, Huang et al investigated the role of RbcX, one of the chaperones […]

Rate of photosynthetic acclimation to fluctuating light varies widely among genotypes of wheat (bioRxiv)

The speed at which photosynthesis is induced during shade-sun transitions, such as sun-flecks, contributes towards determining crop yield.  The speed of induction can be limited by the dynamics of stomatal and mesophyll conductance, deactivation rates of photoprotective mechanisms, the acclimation rate of photosynthesis, and the activity of Rubisco activase.  Salter et al screened 58 genotypes of […]