Similar hydraulic efficiency and safety across vesselless angiosperms and vessel-bearing species with scalariform perforation plates
TRUEBA, Santiago
Botanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
Botanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
ISNARD, Sandrine
Botanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
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Botanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
TRUEBA, Santiago
Botanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
Botanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
ISNARD, Sandrine
Botanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
< Réduire
Botanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
Langue
en
Article de revue
Ce document a été publié dans
Journal of Experimental Botany. 2019, vol. 70, n° 12, p. 3227-3240
Oxford University Press (OUP)
Résumé en anglais
The evolution of xylem vessels from tracheids is put forward as a key innovation that boosted hydraulic conductivity and photosynthetic capacities in angiosperms. Yet, the role of xylem anatomy and interconduit pits on ...Lire la suite >
The evolution of xylem vessels from tracheids is put forward as a key innovation that boosted hydraulic conductivity and photosynthetic capacities in angiosperms. Yet, the role of xylem anatomy and interconduit pits on hydraulic performance across vesselless and vessel-bearing angiosperms is incompletely known, and there is a lack of functional comparisons of ultrastructural pits between species with different conduit types. We assessed xylem hydraulic conductivity and vulnerability to drought-induced embolism in 12 rain forest species from New Caledonia, including five vesselless species, and seven vessel-bearing species with scalariform perforation plates. We measured xylem conduit traits, along with ultrastructural features of the interconduit pits to assess the relationships between conduit traits and hydraulic efficiency and safety. In spite of major differences in conduit diameter, conduit density, and the presence/absence of perforation plates, the species studied showed similar hydraulic conductivity and vulnerability to drought-induced embolism, indicating functional similarity between both types of conduits. Interconduit pit membrane thickness (Tm) was the only measured anatomical feature that showed a relationship with significant vulnerability to embolism. Our results suggest that the incidence of drought on rain forest ecosystems can have similar effects on species bearing water conducting cells with different morphologies.< Réduire
Mots clés en anglais
Vessel elements
Tracheids
Scalariform perforation plates
Drought resistance
Embolism resistance
Interconduit pit membrane thickness
New Caledonia
Rain forest ecology
Wood anatomy
Vesselless angiosperms
Origine
Importé de halUnités de recherche