Water availability is one of the biggest constraints limiting the plant growth and
species distribution around the world. This is the case in the Mediterranean region
where, moreover, the frequency and amount of rainfall will decrease due to global
warming. This will provoke longer periods of drought and a general decrease of water
availability. In this context, one of the most vulnerable crops is grapevine. This crop has
been traditionally rain-feed, although in recent years it’s becoming an irrigated crop.
This increases the demand to regulate the water use by more precise irrigation
techniques based on the plant water status. A good physiological indicator that allows
knowing the plant water status is stomatal conductance. Although it is widely known
the importance of the stoma, there is not an accurate model to predict their behavior as
many physiological and environmental parameters co-regulate it.
The aims of this thesis are to: a) study the physiological mechanisms regulating
stomatal conductance, b) apply a process-based model to predict the behavior of
stomatal conductance c) use this model as tool to better understand the physiological
stomatal regulation along the canopy.
Results show that stoma has a strong regulation by hydraulic conductance being
a key physiological parameter regulating water use. In addition, abscisic acid and
osmotic adjustment are also playing an important role in their regulation. On the other
hand, the mechanistic model of stomatal conductance has been validated predicting with
a good accuracy the variations throughout the day and season in well water and water
stress conditions. At time, because this model is based on physiological parameters
permits to infer about the relevance of those physiological parameters under water
stress, predicting that hydraulic conductance has a main role on the regulation of
stomatal conductance in different parts of the canopy.
| Identifer | oai:union.ndltd.org:TDX_UIB/oai:www.tdx.cat:10803/288210 |
| Date | 11 December 2014 |
| Creators | Martorell Lliteras, Sebastià |
| Contributors | Medrano Gil, Hipólito, Díaz Espejo, Antonio, Universitat de les Illes Balears. Departament de Biologia |
| Publisher | Universitat de les Illes Balears |
| Source Sets | Universitat de les Illes Balears |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/doctoralThesis, info:eu-repo/semantics/publishedVersion |
| Format | 234 p., application/pdf |
| Source | TDX (Tesis Doctorals en Xarxa) |
| Rights | ADVERTIMENT. L'accés als continguts d'aquesta tesi doctoral i la seva utilització ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, així com en activitats o materials d'investigació i docència en els termes establerts a l'art. 32 del Text Refós de la Llei de Propietat Intel·lectual (RDL 1/1996). Per altres utilitzacions es requereix l'autorització prèvia i expressa de la persona autora. En qualsevol cas, en la utilització dels seus continguts caldrà indicar de forma clara el nom i cognoms de la persona autora i el títol de la tesi doctoral. No s'autoritza la seva reproducció o altres formes d'explotació efectuades amb finalitats de lucre ni la seva comunicació pública des d'un lloc aliè al servei TDX. Tampoc s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i índexs., info:eu-repo/semantics/openAccess |
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