DOMEC, Jean-Christophe; KING, John; CARMICHAEL, Mary; OVERBY, Anna Treado; WORTEMANN, Remi; SMITH, William; MIAO, Guofang; NOORMETS, Asko; JOHNSON, Daniel

doi:10.1093/jxb/erab100

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DOMEC, Jean-Christophe
Interactions Sol Plante Atmosphère [UMR ISPA]
Nicholas School of the Environment

KING, John
North Carolina State University [Raleigh] [NC State]

CARMICHAEL, Mary
Hollins University

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Article de revue

Ce document a été publié dans

Journal of Experimental Botany. 2021-05-28, vol. 72, n° 12, p. 4489-4501

Oxford University Press (OUP)

Résumé en anglais

The influence of aquaporin (AQP) activity on plant water movement remains unclear, especially in plants subject to unfavorable conditions. We applied a multitiered approach at a range of plant scales to (i) characterize the resistances controlling water transport under drought, flooding, and flooding plus salinity conditions; (ii) quantify the respective effects of AQP activity and xylem structure on root (K-root), stem (K-stem), and leaf (K-leaf) conductances; and (iii) evaluate the impact of AQP-regulated transport capacity on gas exchange. We found that drought, flooding, and flooding plus salinity reduced K(root )and root AQP activity in Pinus taeda, whereas K-root of the flood-tolerant Taxodium distichum did not decline under flooding. The extent of the AQP control of transport efficiency varied among organs and species, ranging from 35-55% in K-root to 10-30% in K-stem and K-leaf. In response to treatments, AQP-mediated inhibition of K root rather than changes in xylem acclimation controlled the fluctuations in K-root. The reduction in stomata! conductance and its sensitivity to vapor pressure deficit were direct responses to decreased whole-plant conductance triggered by lower K-root and larger resistance belowground. Our results provide new mechanistic and functional insights on plant hydraulics that are essential to quantifying the influences of future stress on ecosystem function.< Réduire

Mots clés en anglais

aquaporin activity

bald cypress

conductances

flooding

leaf water relations

loblolly pine

Pinus taeda

plant hydraulics

Taxodium distichum

water stress

URI

https://oskar-bordeaux.fr/handle/20.500.12278/195420

DOI

http://dx.doi.org/10.1093/jxb/erab100

Project ANR

Effet du changement climatique sur les stratégies d'amélioration de l'utilisation en eau des bassin versants et des systèmes agrosylvopastoraux Méditerranéens - ANR-18-PRIM-0006
Assessments of vulnerability of mature and secondary forests to climatic water stress in Southeast Asia - ANR-17-ASIE-0007

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Importé de hal

Unités de recherche

Interactions Soil Plant Atmosphere (ISPA) - UMR 1391