Dépouillements

Effects of climate variability on secondary xylem formation and anatomy in Fagus sylvatica trees grown in Denmark / Huang Weiwei in Botany letters, vol. 172, n°1 (Année 2025)

Public [article]  inBotany letters > vol. 172, n°1 (Année 2025) . - pp. 87-100 Titre : Effects of climate variability on secondary xylem formation and anatomy in Fagus sylvatica trees grown in Denmark Auteurs : Huang Weiwei, Auteur ; Lundqvist Sven-Olof, Auteur Article en page(s) : pp. 87-100 Langues : Anglais (eng) Catégories : [ZG] Danemark [Espèces (in biblio)] Fagus sylvatica [Thèmes] Changement climatique Résumé : "Tree-ring width chronologies of Fagus sylvatica L. have been studied to understand the growth–climate relationship in Denmark, but there is little evidence of a clear climate signal in such tree-ring width data. In this study, tree-ring width chronologies of F. sylvatica trees growing in an even-aged stand in Denmark over the period 1972–2012 were supplemented with wood density and quantitative wood anatomy variables using the SilviScan-3 combined set-up. The effects of moisture availability and temperature variations on xylem features were investigated. Some xylem features showed stronger associations with drought index (DI) and temperature than ring width. Specifically, the September drought was associated with an increased mean area of the individual fibers in the ring formed the following year. Drought in October resulted in a higher density the following year, probably via increased fiber wall thickness and decreased areas of individual vessels. Further, late summer and early autumn warming increased the vessel density in the following year, but drought reduced their cross-sectional area. By dividing tree rings into ten segments, relationships between wood density and DI could be evaluated at the intra-annual level. In the third segment, wood density decreased with previous year December drought, while the April drought increased the wood density of this segment. Together, the results indicated that xylem formation and anatomy in F. sylvatica seem to be linked to moisture availability and temperature, and that dry and warm conditions affect xylem features differently depending on when they occur relative to wood formation." (source : auteurs) Type de publication : périodique Référence biblio : Weiwei H., Sven-Olof L., 2025 - Effects of climate variability on secondary xylem formation and anatomy in Fagus sylvatica trees grown in Denmark. Botany letters, 172 (1) : 87-100. ID PMB : 73014 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=73014 [article]

Exemplaires(1)

Cote	Localisation	Disponibilité
P0177-6	Brest	Disponible

Fruit characters in early divergent Arecaceae-Arecoideae: comparative carpology of Hyophorbe Gaertn. (Chamaedoreeae) / Anton S. Timchenko in Botany letters, vol. 172, n°1 (Année 2025)

Public [article]  inBotany letters > vol. 172, n°1 (Année 2025) . - pp. 101-115 Titre : Fruit characters in early divergent Arecaceae-Arecoideae: comparative carpology of Hyophorbe Gaertn. (Chamaedoreeae) Auteurs : Anton S. Timchenko, Auteur ; M.S. Romanov, Auteur ; A.V.F.C. Bobrov, Auteur ; Nikita S. Zdravchev, Auteur ; Petr S. Lovlev, Auteur ; Anna A. Mikhaylova, Auteur ; Kirill V. Kuptsov, Auteur ; Alexey N. Sorokin, Auteur Article en page(s) : pp. 101-115 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Arecaceae [Thèmes] Graines [Thèmes] Hyophorbe amaricaulis Mots-clés : Arecoideae  palmier Résumé : "The phylogenetic relationships of two early divergent tribes of Arecoideae (Chamaedoreeae and Iriarteeae) remain poorly resolved. Nevertheless, in some phylogenetic reconstructions the genus Hyophorbe is recognized as the earliest divergent genus of the subfamily. Hence, the fruit anatomy, histogenesis and organogenesis of Hyophorbe species is studied here, with the aim of revealing the key carpological characters of early divergent taxa of Arecaceae – Arecoideae. The multilayered pericarp consists mostly of the mesocarp (parenchymatous cells with different inclusions) and differentiates into outer and inner zones from its early developmental stages (in H. lagenicaulis an additional 1–3 layered inner subdermal zone develops in the inner mesocarp). The one-layered endocarp is represented either by palisade sclereids, lignification of which begins at late developmental stages, or by almost unspecialized thin-walled epidermal cells. The fruits of Hyophorbe species are referred to two different morphogenetic types: the pyrenariums of the Ilex type with a one-layered lignified endocarp (H. lagenicaulis, H. verschaffeltii, H. indica) and berries of the Nuphar type without a continuous lignified zone in the pericarp (H. vaughanii and H. amaricaulis). It is shown that the lignified palisade endocarp could be interpreted as a plesiomorphic character state of Ceroxyloideae – Arecoideae clade, whereas a non-lignified endocarp could be treated as an apomorphy of this clade or a plesiomorphic character state of the family Arecaceae." (source : auteurs) Type de publication : périodique Référence biblio : Timchenko A., Romanov M.-S., Bobrov A.-V.-F.-C., Zdravchev N., Lovlev P., Mikhaylova A., Kuptsov K., Sorokin A., 2025 - Fruit characters in early divergent Arecaceae-Arecoideae: comparative carpology of Hyophorbe Gaertn. (Chamaedoreeae). Botany letters, 172 (1) : 101-115. ID PMB : 73109 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=73109 [article]

Exemplaires(1)

Cote	Localisation	Disponibilité
P0177-6	Brest	Disponible