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Elferjani R, Benomar L, Momayyezi M, Tognetti R, Niinemets Ü, Soolanayakanahally RY, Théroux-Rancourt G, Tosens T, Ripullone F, Bilodeau-Gauthier S, Lamhamedi MS, Calfapietra C, Lamara M. A meta-analysis of mesophyll conductance to CO2 in relation to major abiotic stresses in poplar species. J Exp Bot 2021; 72:4384-4400. [PMID: 33739415 PMCID: PMC8163042 DOI: 10.1093/jxb/erab127] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 03/17/2021] [Indexed: 05/16/2023]
Abstract
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.
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Affiliation(s)
- Raed Elferjani
- Quebec Network for Reforestation and Intensive Silviculture, TELUQ University, Montreal, QC, H2S 3L5, Canada
| | - Lahcen Benomar
- Forest Research Institute, University of Quebec in Abitibi-Temiscamingue, Rouyn-Noranda, QC, J9X 5E4, Canada
- Correspondence:
| | - Mina Momayyezi
- Department of Viticulture and Enology, University of California, Davis, CA 95616, USA
| | - Roberto Tognetti
- Università degli Studi del Molise, Via De Sanctis, 86100 Campobasso, Italy
| | - Ülo Niinemets
- Estonian University of Life Sciences, Kreutzwaldi 1, 51006 Tartu, Estonia
| | | | - Guillaume Théroux-Rancourt
- Institute of Botany, University of Natural Resources and Life Sciences, Gregor-Mendel-Strasse 33, 1180 Vienna, Austria
| | - Tiina Tosens
- Estonian University of Life Sciences, Kreutzwaldi 1, 51006 Tartu, Estonia
| | | | | | - Mohammed S Lamhamedi
- Direction de la Recherche Forestière, 2700 rue Einstein, Québec, QC, G1P 3W8, Canada
| | - Carlo Calfapietra
- Institute of Agro-Environmental & Forest Biology (IBAF), National Research Council (CNR), Via Marconi 2, Porano (TR) 05010, Italy
| | - Mebarek Lamara
- Forest Research Institute, University of Quebec in Abitibi-Temiscamingue, Rouyn-Noranda, QC, J9X 5E4, Canada
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