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New star on the stage: Amount of ray parenchyma in tree rings shows a link to climate

AutorOlano Mendoza, José Miguel; Arzac, Alberto; Arx, Georg von; Rozas Ortiz, Vicente Fernando ; García-Cervigón, Ana I.
Palabras claveJuniperus thurifera
Climate signal
Ray parenchyma
Tree-ring anatomy
Fecha de publicación2013
EditorBlackwell Publishing
CitaciónNew Phytologist 198 (2): 486- 495 (2013)
ResumenTree-ring anatomy reflects the year-by-year impact of environmental factors on tree growth. Up to now, research in this field has mainly focused on the hydraulic architecture, with ray parenchyma neglected despite the growing recognition of its relevance for xylem function. Our aim was to address this gap by exploring the potential of the annual patterns of xylem parenchyma as a climate proxy. We constructed ring-width and ray-parenchyma chronologies from 1965 to 2004 for 20 Juniperus thurifera trees growing in a Mediterranean continental climate. Chronologies were related to climate records by means of correlation, multiple regression and partial correlation analyses. Ray parenchyma responded to climatic conditions at critical stages during the xylogenetic process; namely, at the end of the previous year's xylogenesis (October) and at the onset of earlywood (May) and latewood formation (August). Ray parenchyma-based chronologies have potential to complement ring-width chronologies as a tool for climate reconstructions. Furthermore, medium- and low-frequency signals in the variation of ray parenchyma may improve our understanding of how trees respond to environmental fluctuations and to global change. © 2013 New Phytologist Trust.
Versión del editorhttp://dx.doi.org/10.1111/nph.12113
Identificadoresdoi: 10.1111/nph.12113
issn: 0028-646X
e-issn: 1469-8137
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