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Acclimation of mesophyll conductance and anatomy to light during leaf aging in Arabidopsis thaliana


Carriqui Alcover, M and Nadal, M and Flexas, J, Acclimation of mesophyll conductance and anatomy to light during leaf aging in Arabidopsis thaliana, Physiologia Plantarum, 172, (4) pp. 1894-1907. ISSN 0031-9317 (2021) [Refereed Article]

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2021 Scandinavian Plant Physiology Society.

DOI: doi:10.1111/ppl.13398


Mesophyll conductance (g(m)), a key limitation to photosynthesis, is strongly driven by leaf anatomy, which is in turn influenced by environmental growth conditions and ontogeny. However, studies examining the combined environment x age effect on both leaf anatomy and photosynthesis are scarce, and none have been carried out in short-lived plants. Here, we studied the variation of photosynthesis and leaf anatomy in the model species Arabidopsis thaliana (Col-0) grown under three different light intensities at two different leaf ages. We found that light x age interaction was significant for photosynthesis but not for anatomical characteristics. Increasing growth light intensities resulted in increases in leaf mass per area, thickness, number of palisade cell layers, and chloroplast area lining to intercellular airspace. Low and moderate-but not high-light intensity had a significant effect on all photosynthetic characteristics. Leaf aging was associated with increases in cell wall thickness (T-cw) in all light treatments and in increases in leaf thickness in plants grown under low and moderate light intensities. However, g(m) did not vary with leaf aging, and photosynthesis only decreased with leaf age under moderate and high light, suggesting a compensatory effect between increased T-cw and decreased chloroplast thickness on the total CO2 diffusion resistance.

Item Details

Item Type:Refereed Article
Keywords:photosynthetic electron-transport, gas-exchange, diffusion conductance CO2 assimilation, tree, plant, leaves, model, water, temperature
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Horticultural production
Research Field:Field organic and low chemical input horticulture
Objective Division:Plant Production and Plant Primary Products
Objective Group:Other plant production and plant primary products
Objective Field:Climate adaptive plants
UTAS Author:Carriqui Alcover, M (Mr Marc Carriqui Alcover)
ID Code:151897
Year Published:2021
Web of Science® Times Cited:6
Deposited By:Office of the School of Natural Sciences
Deposited On:2022-08-08
Last Modified:2022-09-30

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