New star on the stage: amount of ray parenchyma in tree rings shows a link to climate
Article first published online: 14 JAN 2013
© 2013 The Authors. New Phytologist © 2013 New Phytologist Trust
Volume 198, Issue 2, pages 486–495, April 2013
How to Cite
Olano, J. M., Arzac, A., García-Cervigón, A. I., von Arx, G. and Rozas, V. (2013), New star on the stage: amount of ray parenchyma in tree rings shows a link to climate. New Phytologist, 198: 486–495. doi: 10.1111/nph.12113
- Issue published online: 20 MAR 2013
- Article first published online: 14 JAN 2013
- Manuscript Accepted: 28 NOV 2012
- Manuscript Received: 19 OCT 2012
- FPI-MICINN. Grant Number: CGL2009-13190-C03-03
- Spanish Ministry of Science and Innovation. Grant Number: VA006A10-2
- Junta de Castilla y León
- climate signal;
- Juniperus thurifera ;
- ray parenchyma;
- tree-ring anatomy
Tree-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.