New star on the stage: amount of ray parenchyma in tree rings shows a link to climate
José Miguel Olano1,*, Alberto Arzac2, Ana I. García-Cervigón1, Georg von Arx3, Vicente Rozas4
© 2013 The Authors. New Phytologist © 2013 New Phytologist Trust
오늘 뉴 파이톨로지스트 트에 올라온 논문. 잘 들여다 보면 연구 꺼리가 터져나올 수도 있겠다 싶어 소개. 이 저널 또 정말 좋아.. 아 좋아..
http://onlinelibrary.wiley.com/doi/10.1111/nph.12229/full
코멘터리는 여기에
http://onlinelibrary.wiley.com/doi/10.1111/nph.12113/abstract
Keywords:
climate signal; dendrochronology; Juniperus thurifera ; ray parenchyma; tree-ring anatomy
Summary
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.