RT Journal Article
SR Electronic
T1 A meta-analysis of mesophyll conductance to CO<sub>2</sub> in relation to major abiotic stresses in poplar species
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 2020.10.19.346270
DO 10.1101/2020.10.19.346270
A1 Raed Elferjani
A1 Lahcen Benomar
A1 Mina Momayyezi
A1 Roberto Tognetti
A1 Ülo Niinemets
A1 Raju Y. Soolanayakanahally
A1 Guillaume Théroux-Rancourt
A1 Tiina Tosens
A1 Mebarek Lamara
A1 Francesco Ripullone
A1 Simon Bilodeau-Gauthier
A1 Mohammed S. Lamhamedi
A1 Carlo Calfapietra
YR 2020
UL http://biorxiv.org/content/early/2020/10/21/2020.10.19.346270.abstract
AB Mesophyll conductance (gm) determines the diffusion of CO2 from the substomatal cavities to the site of carboxylation in the chloroplasts and represents a critical limiting factor to 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 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). Also, a negative linear relation was obtained between gm and specific leaf area, which may be used to scale-up gm within the canopy.