The meeting of stomata, trichomes and xylem: Are leaf and wood anatomy coordinated to control water loss and transport in olive?

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ID: 326170
2026
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Ranked #107 of 269 articles by views in Annals of botany

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Abstract
Abstract Background and Aims Photosynthetic tissues of terrestrial plants require a continuous water supply to avoid desiccation while allowing CO2 to diffuse to chloroplasts. This imposes a functional coordination between water-conducting tissues and stomatal regulation. What is the anatomical basis of this coordination? Methods We assessed anatomical traits of stomata, trichomes, and xylem vessels as well as branch allocation patterns in 30 olive varieties grown under common environmental conditions in Southern France. Theoretical conductances of leaves and stems were calculated and compared to maximal leaf conductance measured in the field. We also tested whether wood density could serve as a proxy for stem conductance. Results Stomata, trichomes, and xylem vessels showed positive covariation in size, but not in density. Consequently, no coordination was observed between the total stem vessel area and the total stomatal pore area, nor between the theoretical conductances of stems and leaves. However, we found a positive association between the stomatal pore area and the lumen area when values were scaled at the branch level. Maximal leaf conductance was negatively related to trichome area, but not to theoretical stomatal conductance. Wood density correlated negatively with the lumen fraction in stems, but not with stem conductance. Conclusions We conclude that coordination between water transport and loss likely occurs at the branch level, involving allocation patterns beyond anatomy, and that the role of trichomes in water regulation deserves further study in pubescent-leaved species.
Reference Key
openalex_W7204006319 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Eric Garnier, Jean‐Frédéric Terral, Bertrand Limier, Alexandre Albo, Sylvain Delzon, Karim Barkaoui
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Journal Annals of botany
Year 2026
DOI
10.1093/aob/mcag267
URL
https://doi.org/10.1093/aob/mcag267
Keywords Keywords not found

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