Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Default user image.

Annemarie Eckes-Shephard

Forskare

Default user image.

Manipulating phloem transport affects wood formation but not local nonstructural carbon reserves in an evergreen conifer

Författare

  • Tim Rademacher
  • Patrick Fonti
  • James M. LeMoine
  • Marina V. Fonti
  • David Basler
  • Yizhao Chen
  • Andrew D. Friend
  • Bijan Seyednasrollah
  • Annemarie H. Eckes-Shephard
  • Andrew D. Richardson

Summary, in English

How variations in carbon supply affect wood formation remains poorly understood in particular in mature forest trees. To elucidate how carbon supply affects carbon allocation and wood formation, we attempted to manipulate carbon supply to the cambial region by phloem girdling and compression during the mid- and late-growing season and measured effects on structural development, CO2 efflux and nonstructural carbon reserves in stems of mature white pines. Wood formation and stem CO2 efflux varied with a location relative to treatment (i.e., above or below the restriction). We observed up to twice as many tracheids formed above versus below the treatment after the phloem transport manipulation, whereas the cell-wall area decreased only slightly below the treatments, and cell size did not change relative to the control. Nonstructural carbon reserves in the xylem, needles and roots were largely unaffected by the treatments. Our results suggest that low and high carbon supply affects wood formation, primarily through a strong effect on cell proliferation, and respiration, but local nonstructural carbon concentrations appear to be maintained homeostatically. This contrasts with reports of decoupling of source activity and wood formation at the whole-tree or ecosystem level, highlighting the need to better understand organ-specific responses, within-tree feedbacks, as well as phenological and ontogenetic effects on sink-source dynamics.

Avdelning/ar

  • BECC: Biodiversity and Ecosystem services in a Changing Climate
  • MERGE: ModElling the Regional and Global Earth system
  • Institutionen för naturgeografi och ekosystemvetenskap

Publiceringsår

2021-08

Språk

Engelska

Sidor

2506-2521

Publikation/Tidskrift/Serie

Plant Cell and Environment

Volym

44

Issue

8

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley-Blackwell

Ämne

  • Physical Geography

Nyckelord

  • allocation
  • girdling
  • growth
  • Pinus strobus
  • respiration
  • wood anatomy
  • xylogenesis

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0140-7791