Entries by Mike Page

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 […]

Expert View: The nitrogen cost of photosynthesis (J Exp Bot)

Modern crop production is intimately linked to the availability of nitrogen.  Photosynthetic proteins (including rubisco) account for most of the nitrogen in leaves, a significant amount of which is removed during harvesting and must be replenished primarily through the application of synthetic nitrogen fertilisers. In this Expert View, Evans & Clarke revisit the nitrogen budget of […]

What We’re Reading: November 16th

Photosynthesis Special Issue This week’s ‘What We’re Reading’ summarizes the latest papers from the field of photosynthesis research.  This includes a review on the discovery of the Calvin-Benson cycle by Tom Sharkey, and an Expert View on the relationship between nitrogen and photosynthesis by John Evans & Victoria Clarke.  There are also summaries of research […]

Diffusion of CO2 across the mesophyll-bundle sheath cell interface in a C4 plant with genetically reduced PEP carboxylase activity (Plant Physiol.)

C4 photosynthesis relies on the transport of carbon (in the form of C4 acids) from the mesophyll into bundle sheath cells (BSCs).  Subsequent decarboxylation of these C4 acids generates a high concentration of CO2 in the vicinity of Rubisco, helping to improve the catalytic efficiency of this enzyme.  However, carbon can also enter BSCs via […]

Review:  New insights into the cellular mechanisms of plant growth at elevated atmospheric carbon dioxide (Plant Cell Environ) $

Elevated CO2 (eCO2) encourages plant growth through increased photosynthetic rates and lower stomatal conductance.  However, eCO2 also has knock-on effects on plant secondary metabolism, which can also affect plant growth.  In this review, Gamage et al explore these ‘post-photosynthetic’ effects in detail.  Through analysis of the literature, the authors show that eCO2 modulates carbon metabolism, […]

Review:  C4-like photosynthesis has important functions in C3 plant vasculature (JXB)

In contrast to the much-studied photosynthetic processes in C4 plant vasculature, the processes in the cells surrounding C3 veins remain much less understood.  Here, there appears to be a partial and more spatially-separated C4 pathway, which has been observed in several species including rice, Arabidopsis, Scots pine and celery.  In this review, Gao et al […]

Dynamic feedback of the photosystem II reaction centre on photoprotection in plants (Nat Plants) $

The light reactions of photosynthesis are under constant regulation in order to continue operating efficiently and avoid photodamage in a fluctuating light environment.  One mechanism to avoid photodamage is the dissipation of excess excitation energy as heat, which can be determined by measuring non-photochemical quenching (NPQ) of chlorophyll fluorescence.  The various mechanisms responsible for NPQ […]