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Arabidopsis thaliana as a model species for xylem hydraulics: does size matter?

Tixier, Aude ; Cochard, Hervé ; Badel, Eric ; Dusotoit-Coucaud, Anaïs ; Jansen, Steven ; Herbette, Stéphane

Journal of experimental botany, 2013-05, Vol.64 (8), p.2295-2305 [Periódico revisado por pares]

Oxford: Oxford University Press

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Título:
Arabidopsis thaliana as a model species for xylem hydraulics: does size matter?
Autor: Tixier, Aude ; Cochard, Hervé ; Badel, Eric ; Dusotoit-Coucaud, Anaïs ; Jansen, Steven ; Herbette, Stéphane
Assuntos: Arabidopsis - anatomy & histology ; Arabidopsis - physiology ; Biological and medical sciences ; Botany ; Cavitation flow ; Fundamental and applied biological sciences. Psychology ; Genetics ; Hydraulics ; Inflorescences ; Life Sciences ; Models, Biological ; Photoperiod ; Plant cells ; Plant physiology and development ; Plant Stems - anatomy & histology ; Plant Stems - physiology ; Plants ; RESEARCH PAPER ; Species ; Stems ; Vegetal Biology ; Water - metabolism ; Xylem ; Xylem - anatomy & histology ; Xylem - physiology
É parte de: Journal of experimental botany, 2013-05, Vol.64 (8), p.2295-2305
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SourceType-Scholarly Journals-1
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Descrição: While Arabidopsis thaliana has been proposed as a model species for wood development, the potential of this tiny herb for studying xylem hydraulics remains unexplored and anticipated by scepticism. Inflorescence stems of A. thaliana were used to measure hydraulic conductivity and cavitation resistance, whereas light and electron microscopy allowed observations of vessels. In wild-type plants, measured and theoretical conductivity showed a significant correlation (R 2 = 0.80, P < 0.01). Moreover, scaling of vessel dimensions and intervessel pit structure of A. thaliana were consistent with structure–function relationships of woody plants. The reliability and resolution of the hydraulic methods applied to measure vulnerability to cavitation were addressed by comparing plants grown under different photoperiods or different mutant lines. Sigmoid vulnerability curves of A. thaliana indicated a pressure corresponding to 50% loss of hydraulic conductance (P 50 ) between –3 and –2.5MPa for short-day and long-day plants, respectively. Polygalacturonase mutants showed a higher P 50 value (–2.25 MPa), suggesting a role for pectins in vulnerability to cavitation. The application of A. thaliana as a model species for xylem hydraulics provides exciting possibilities for (1) exploring the molecular basis of xylem anatomical features and (2) understanding genetic mechanisms behind xylem functional traits such as cavitation resistance. Compared to perennial woody species, however, the lesser amount of xylem in A. thaliana has its limitations.
Editor: Oxford: Oxford University Press
Idioma: Inglês

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Arabidopsis thaliana as a model species for xylem hydraulics: does size matter?

Tixier, Aude ; Cochard, Hervé ; Badel, Eric ; Dusotoit-Coucaud, Anaïs ; Jansen, Steven ; Herbette, Stéphane

Oxford: Oxford University Press

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