Insights into source/sink controls on wood formation and photosynthesis from a stem chilling experiment in mature red maple
Rademacher, Tim ; Fonti, Patrick ; LeMoine, James M ; Fonti, Marina V ; Bowles, Francis ; Chen, Yizhao ; Eckes-Shephard, Annemarie H LU
; Friend, Andrew D
and Richardson, Andrew D
(2022)
In New Phytologist
236(4).
p.1296-1309
- Abstract
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... (More)
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.
(Less)
- author
- Rademacher, Tim
; Fonti, Patrick
; LeMoine, James M
; Fonti, Marina V
; Bowles, Francis
; Chen, Yizhao
; Eckes-Shephard, Annemarie H
LU
; Friend, Andrew D
and Richardson, Andrew D
- organization
- publishing date
- 2022-11
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- anatomy, growth, nonstructural carbon, phloem, sink, source, wood, xylogenesis
- in
- New Phytologist
- volume
- 236
- issue
- 4
- pages
- 14 pages
- publisher
- Wiley-Blackwell
- external identifiers
-
- pmid:35927942
- scopus:85136473227
- ISSN
- 1469-8137
- DOI
- 10.1111/nph.18421
- project
- Redefining the carbon sink capacity of global forests: The driving role of tree mortality
- language
- English
- LU publication?
- yes
- additional info
- © 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation.
- id
- 11e5bbb2-58bb-43c6-af0b-80d4f80e2fd6
- date added to LUP
- 2022-09-27 14:48:18
- date last changed
- 2024-06-14 22:25:07
@article{11e5bbb2-58bb-43c6-af0b-80d4f80e2fd6,
abstract = {{<p>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.</p>}},
author = {{Rademacher, Tim and Fonti, Patrick and LeMoine, James M and Fonti, Marina V and Bowles, Francis and Chen, Yizhao and Eckes-Shephard, Annemarie H and Friend, Andrew D and Richardson, Andrew D}},
issn = {{1469-8137}},
keywords = {{anatomy; growth; nonstructural carbon; phloem; sink; source; wood; xylogenesis}},
language = {{eng}},
number = {{4}},
pages = {{1296--1309}},
publisher = {{Wiley-Blackwell}},
series = {{New Phytologist}},
title = {{Insights into source/sink controls on wood formation and photosynthesis from a stem chilling experiment in mature red maple}},
url = {{https://lup.lub.lu.se/search/files/157522287/Rademacher_2022_Insights_into_source_sink_controls_on_accepted_version_.pdf}},
doi = {{10.1111/nph.18421}},
volume = {{236}},
year = {{2022}},
}