1,720,979 research outputs found
Phloem as a possible major determinant of rapid cavitation reversal in stems of Laurus nobilis (laurel)
No full textDiurnal and seasonal variations in leaf hydraulic conductance in evergreen and deciduous trees
No full textDrought resistance of 2-year-old saplings of Mediterranean forest trees in the field: relations between water relations, hydraulics and productivity
No full textKinetics of recovery of leaf hydraulic conductance and vein functionality from cavitation-induced embolism in sunflower
No full textWater relations and hydraulic characteristics of three woody species co-occurring in the same habitat
No full textNew evidence for a role of vessel-associated cells and phloem in the rapid refilling of cavitated stems of Laurus nobilis L.
No full textSeasonal changes of plant hydraulics, water relations and growth of Aesculus hippocastanum seedlings infested by the leaf miner Cameraria ohridella
No full textThe leaf miner Cameraria ohridella causes premature defoliation in Aesculus hippocastanum. The impact of the parasite on seasonal changes of water relations, hydraulics and growth of three-year-old A. hippocastanum seedlings was investigated. Leaf expansion was complete before the adults of the moth developed, so that growth of infested seedlings was similar to that of controls. Leaf conductance to water vapour of infested seedlings was reduced with respect to controls, both in mined and in still green portions of attacked leaves. In July and August, the hydraulic resistance of infested seedlings was higher than that of controls, due to anticipated increase of hydraulic resistance at the leaf, petiole and current-year stem level. This was interpreted as evidence of anticipated leaf senescence in infested plants, leading to early leaf abscission. Nevertheless, our data suggest that, under our experimental conditions, C. ohridella is not a major mortality factor for A. hippocastanum seedlings.Variations saisonnières des propriétés hydrauliques, des relations hydriques et de la croissance de jeunes plants d’Aesculus hippocastanum infestés par la mineuse foliaire Cameraria ohridella. La mineuse foliaire Cameraria ohridella provoque des défoliations prématurées chez le Marronnier (Aesculus hippocastanum). L’impact du parasite sur les variations saisonnières des relations hydriques, des paramètres hydrauliques et de la croissance de plants d’A. hippocastanum âgés de 3 ans a été analysé. L’expansion foliaire étant terminée avant que les adultes de l’insecte soient développés, la croissance des plants infestés fut similaire à celle des plants témoins. La conductance foliaire à la vapeur d’eau des plants infestés fut réduite par rapport aux témoins, que ce soit dans les parties encore vertes des feuilles ou dans les parties attaquées. En juillet et août, la résistance hydraulique des plants infestés fut plus élevée que celle des témoins, en raison d’une augmentation anticipée de la résistance hydraulique des feuilles, des pétioles et des tiges de l’année. Ceci fut interprété comme une preuve d’une anticipation de la sénescence foliaire pour les plants infestés, conduisant à une abscission prématurée des feuilles. Néanmoins, nos données suggèrent que, dans nos conditions expérimentales, C. ohridella n’est pas un facteur majeur de mortalité pour les jeunes plant d’A. hippocastanum
Effects of reduced irradiance on hydraulic architecture and water relations of two Olive clones with different growth potentials.
No full textNon-structural carbohydrate and hydraulic dynamics during drought and recovery in Fraxinus ornus and Ostrya carpinifolia saplings
No full textThe maintenance of hydraulic function during and after a drought event is crucial for tree survival, but the
importance of non-structural carbohydrates (NSCs) in the recovery phase is still debated. We tested whether
higher NSC availability facilitates post-drought hydraulic recovery, by applying a short-term drought (Sdr) and a
long-term drought combined with shading (Ldr+sh) in Fraxinus ornus and Ostrya carpinifolia. Plants were then reirrigated
and recovery was checked 24 h later, by measuring water potential, stem percentage loss of hydraulic
conductance (PLC) and NSC content. The relative magnitude of hydraulic and carbon constraints was also assessed
in desiccated plants. During drought, PLC increased only in F. ornus, while it was maintained almost
constant in O. carpinifolia due to tighter stomatal control of xylem pressure (i.e. more isohydric). In F. ornus, only
Sdr plants maintained high NSC contents at the end of drought and, when re-irrigated, recovered PLC to control
values. Whereas hydraulic failure was ubiquitous, only F. ornus depleted NSC reserves at mortality. Our results
suggest that preserving higher NSC content at the end of a drought can be important for the hydraulic resilience
of trees
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