NDLI: Photosynthetic and wood anatomical responses of Tamarix africana Poiret to water level reduction after short-term fresh- and saline-water flooding

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Photosynthetic and wood anatomical responses of Tamarix africana Poiret to water level reduction after short-term fresh- and saline-water flooding

Content Provider	Springer Nature Link
Author	Abou Jaoudé, Renée Dato, Giovanbattista Angelis, Paolo
Copyright Year	2012
Abstract	In the Mediterranean basin, Tamarix spp. constitute important populations along rivers and sea coasts, and might be primarily subjected to water level fluctuations and salinization, as a consequence of global climate change. Here, we analyze leaf gas exchange and xylem anatomy during a water level decrease below the soil surface after short-term flooding with fresh- and saline-water (200 mM) in order to predict Tamarix africana Poiret responses under future environmental conditions. Fresh-water level reduction negatively affected stomatal conductance (−56.3 %), but only when water decreased to the lowest level (15 cm below the soil surface). No effects on assimilation rates and xylem vessel dimensions occurred. Under saline conditions, the rate of the water level decrease was lower compared to the non-saline treatment, as stomatal conductance was negatively affected by salinity (−59.5 %) and significantly declined over time. Moreover, decreases in mean xylem vessel area (−51.3 %), assimilation rates (−52.2 %) and stomatal conductance (−76.0 %) were also observed compared to the control, indicating both an osmotic stress and a toxic effect of NaCl on leaf gas exchange. These leaf responses were probably induced by greater belowground-root salt absorption and transport compared to previous flooding conditions, as confirmed by the increase in salt excretion (+473.2 %). The results emphasize the survival risk of Tamarix spp. to water level variation under both saline and non-saline conditions, and the need of management practices focused on the conservation of these populations.
Starting Page	857
Ending Page	866
Page Count	10
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	27
Issue Number	5
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2012-06-24
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tamarix africana Poiret Water level reduction Salinity Leaf gas exchange Xylem vessels Zoology Plant Sciences Evolutionary Biology Behavioural Sciences Forestry Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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Photosynthetic and wood anatomical responses of Tamarix africana Poiret to water level reduction after short-term fresh- and saline-water flooding