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.

Insights into source/sink controls on wood formation and photosynthesis from a stem chilling experiment in mature red maple

Författare

  • Tim Rademacher
  • Patrick Fonti
  • James M LeMoine
  • Marina V Fonti
  • Francis Bowles
  • Yizhao Chen
  • Annemarie H Eckes-Shephard
  • Andrew D Friend
  • Andrew D Richardson

Summary, in English

Whether sources or sinks control wood growth remains debated with a paucity of evidence from mature trees in natural settings. Here, we altered carbon supply rate in stems of mature red maples (Acer rubrum) within the growing season by restricting phloem transport using stem chilling; thereby increasing carbon supply above and decreasing carbon supply below the restrictions, respectively. Chilling successfully altered nonstructural carbon (NSC) concentrations in the phloem without detectable repercussions on bulk NSC in stems and roots. Ring width responded strongly to local variations in carbon supply with up to seven-fold differences along the stem of chilled trees; however, concurrent changes in the structural carbon were inconclusive at high carbon supply due to large local variability of wood growth. Above chilling-induced bottlenecks, we also observed higher leaf NSC concentrations, reduced photosynthetic capacity, and earlier leaf coloration and fall. Our results indicate that the cambial sink is affected by carbon supply, but within-tree feedbacks can downregulate source activity, when carbon supply exceeds demand. Such feedbacks have only been hypothesized in mature trees. Consequently, these findings constitute an important advance in understanding source-sink dynamics, suggesting that mature red maples operate close to both source- and sink-limitation in the early growing season.

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

2022-11

Språk

Engelska

Sidor

1296-1309

Publikation/Tidskrift/Serie

New Phytologist

Volym

236

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley-Blackwell

Ämne

  • Environmental Sciences
  • Other Biological Topics

Nyckelord

  • anatomy
  • growth
  • nonstructural carbon
  • phloem
  • sink
  • source
  • wood
  • xylogenesis

Status

Published

Projekt

  • Redefining the carbon sink capacity of global forests: The driving role of tree mortality

ISBN/ISSN/Övrigt

  • ISSN: 1469-8137