Congressi Nazionali SISEF

*

Presentazione orale

De Dato G, Micali M, De Angelis P

Morphological and functional adaptations in Cistus monspeliensis L. leaves facing a natural and a prolonged summer aridity

Riassunto: The semi-deciduous summer habit is a common trait of different Mediterranean shrubs. The timing of leaf fall is related to the drought occurrence, exposing these plants to the direct effect of climate changes. The main objective of this research was to verify the dependence of leaf senescence on water shortage in Cistus monspeliensis plants subjected to natural (control) and prolonged (drought) water stress. We studied leaf production and leaf shedding, the parameters related to photosynthesis (assimilation, stomatal conductance, Vcmax, Jmax, dark respiration) and nutrient concentrations (N, C) in green leaves and in fresh leaf litter, in a Mediterranean gariga characterized by severe summer drought. With increasing drought conditions, Cistus replaced its spring leaves (high leaf area, thin leaves and low photosynthetic efficiency) with summer leaves, characterized by low leaf area, increased thickness, high photosynthetic rate and water use efficiency. Leaf senescence in Cistus is controlled by water availability, given that drier conditions (drought treatment) induced changes in photosynthetic parameters and in leaf morphology (earlier onset of summer leaves). The more efficient summer leaves allow Cistus to better utilize water availability during rain events in dry summer, and to start new phenophases with the onset of autumnal wetter climate conditions.

Citazione: De Dato G, Micali M, De Angelis P (2009). Morphological and functional adaptations in Cistus monspeliensis L. leaves facing a natural and a prolonged summer aridity. In: VII Congresso Nazionale SISEF “Sviluppo e adattamento, naturalità e conservazione: opportunità per un sistema forestale in transizione“ (Università degli Studi del Molise, Isernia - Pesche (IS), 29 Settembre - 3 Ottobre 2009), Abstract-book, Contributo #c07.5.6. - [online] URL: https://congressi.sisef.org/?action=paper&id=1247


Dettagli

Congresso VII Congresso Nazionale SISEF
“Sviluppo e adattamento, naturalità e conservazione: opportunità per un sistema forestale in transizione”
Università degli Studi del Molise, Isernia - Pesche (IS), 29 Settembre - 3 Ottobre 2009
Collocazione c07.5.6 (#)
Sessione Sessione 05
Moderatore/i Paolo De Angelis, Francesco Loreto
Data Sep 30, 2009
Ora 14:30-16:30
Luogo -
Info Autori
(*): speaker

G De Dato*
Department of Forest Environment and Resources (DISAFRI), University of Tuscia, via S. Camillo De Lellis snc - 01100 Viterbo VT Italy
Italy

M Micali
Department of Forest Environment and Resources (DISAFRI), University of Tuscia, via S. Camillo De Lellis snc - 01100 Viterbo VT Italy
Italy

P De Angelis
Department of Forest Environment and Resources (DISAFRI), University of Tuscia, via S. Camillo De Lellis snc - 01100 Viterbo VT Italy
Italy