Intra-annual patterns of tracheid size in the Mediterranean tree Juniperus thurifera as an indicator of seasonal water stress

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Abstract:

Because climate can affect xylem cell anatomy, series of intra-annual cell anatomical features have the potential to retrospectively supply seasonal climatic information. In this study, we explored the ability to extract information about water stress conditions from tracheid features of the Mediterranean conifer Juniperus thurifera L. Tracheidograms of four climatic years from two drought-sensitive sites in Spain were compared to evaluate whether it is possible to link intra-annual cell size patterns to seasonal climatic conditions. Results indicated site-specific anatomical adjustment such as smaller and thicker tracheids at the dryer site but also showed a strong climatic imprint on the intra-annual pattern of tracheid size. Site differences in cell size reflected expected structural adjustments against cavitation failures. Differences between intra-annual patterns, however, indicated a response to seasonal changes in water availability whereby cells formed under drought conditions were smaller and thicker, and vice versa. This relationship was more manifest and stable at the dryer site.

Document Type: Research Article

DOI: http://dx.doi.org/10.1139/x11-045

Affiliations: 1: Departamento de Ciencias Agroforestales, Área de Botánica, EUI Agrarias, Universidad de Valladolid, Los Pajaritos s/n, E-42004 Soria, Spain. 2: Departamento de Biología, E.U.I.T. Agrícola, Universidad Politécnica de Madrid, E-28040 Madrid, Spain. 3: WSL Swiss Federal Research Institute, Landscape Dynamics, Zürcherstr. 111, CH-8903 Birmensdorf, Switzerland.

Publication date: June 25, 2011

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