Similar hydraulic efficiency and safety across vesselless angiosperms and vessel-bearing species with scalariform perforation plates - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Journal of Experimental Botany Year : 2019

Similar hydraulic efficiency and safety across vesselless angiosperms and vessel-bearing species with scalariform perforation plates

Abstract

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.
Fichier principal
Vignette du fichier
Trueba_etal_J_Exp_Botany_2019_70_12.pdf (1.78 Mo) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

hal-02279487 , version 1 (26-07-2021)

Identifiers

Cite

Santiago Trueba, Sylvain Delzon, Sandrine Isnard, Frederic Lens. Similar hydraulic efficiency and safety across vesselless angiosperms and vessel-bearing species with scalariform perforation plates. Journal of Experimental Botany, 2019, 70 (12), pp.3227-3240. ⟨10.1093/jxb/erz133⟩. ⟨hal-02279487⟩
139 View
155 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More