Role of corticular photosynthesis following defoliation …

Role of corticular photosynthesis following defoliation in Eucalyptus ..

Corticular photosynthesis and growth in Populus …

, and (2011)Stable isotopes reveal the contribution of corticular photosynthesis to growth in branches of Eucalyptus miniata. Plant Physiology, 155 (1). pp. 515-523.

Stem CO2 release under illumination: corticular photosynthesis, photorespiration or inhibition of mitochondrial respiration?


In leaves, O 3 exposure led to a significant decline in photosynthetic rates, whereas stems revealed an increased dark respiration and a concomitant increase in corticular photosynthesis.

In contrast to birch leaves, corticular photosynthesis appeared to support the carbon balance of stems or even of the whole-tree under O 3 stress.

Assimilation of internally-sourced CO2 by woody tissues has been described as a recycling mechanism by which trees can recapture some of the CO2 released by respiration (see review by ). This mechanism has been termed ‘corticular photosynthesis’, implying that the assimilation occurs in the cortical tissue just below the bark, although some reports have shown that chlorophyll can be found in deeper tissues (; ; ). Corticular photosynthesis has usually been measured by gas exchange and calculated as the reduction of CO2 efflux to the atmosphere in the light compared to efflux in the dark (; ; ). This calculation assumes that all CO2 generated in woody tissue fluxes outward to the atmosphere if it is not refixed in cortical tissues. However, CO2 can also move by mass flow in xylem sap, and gas exchange measurements do not account for this internally transported CO2 ().

Ecology and ecophysiology of tree stems: corticular and wood photosynthesis