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A meta-analysis of mesophyll conductance to CO2 in relation to major abiotic stresses in poplar species

Summary

Published in Journal of Experimental Botany. https://doi.org/10.1093/jxb/erab127

Mesophyll conductance (gm) determines the diffusion of CO2 from the substomatal cavities to the site of carboxylation in the chloroplasts and represents a critical component of the diffusive limitation of photosynthesis. In this study, we evaluated the average effect sizes of different environmental constraints on gm in Populus spp., a forest tree model. We collected raw data of 815 A–Ci response curves from 26 datasets to estimate gm, using a single curve-fitting method to alleviate method-related bias. We performed a meta-analysis to assess the effects of different abiotic stresses on gm. We found a significant increase in gm from the bottom to the top of the canopy that was concomitant with the increase of maximum rate of carboxylation and light-saturated photosynthetic rate (Amax). gm was positively associated with increases in soil moisture and nutrient availability, but was insensitive to increasing soil copper concentration and did not vary with atmospheric CO2 concentration. Our results showed that gm was strongly related to Amax and to a lesser extent to stomatal conductance (gs). Moreover, a negative exponential relationship was obtained between gm and specific leaf area, which may be used to scale-up gm within the canopy.

Sector(s): 

Forests

Categorie(s): 

Scientific Article

Theme(s): 

Forestry Research, Forests, Seeds and Forest Seedlings Production, Silviculture

Author(s)

ELFERJANI, R., L. BENOMAR, M. MOMAYYEZI, R. TOGNETTI, Ü. NIINEMETS, R.Y. SOOLANAYAKANAHALLY, G. THÉROUX-Rancourt, T. TOSENS, F. RIPULLONE, Simon BILODEAU-Gauthier, Mohammed S. LAMHAMEDI, C. CALFAPIETRA, M. LAMARA

Year of publication :

2021

Format :

PDF

ISSN

0022-0957

Keywords :

stress abiotique, courbe A-Ci, conductance du mésophylle, méta-analyse, photosynthèse, peuplier, article scientifique de la recherche forestière, production de semences et de plants, sylviculture et rendement des forêts naturelles - peuplements de feuillus, populus, seeds and forest seedlings production, silviculture and yield of natural forests - hardwood stands, forestry research scientific article, Abiotic stress, A–Ci curve, mesophyll conductance, meta-analysis, photosynthesis, poplar

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