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Insights into sourc...
Insights into source/sink controls on wood formation and photosynthesis from a stem chilling experiment in mature red maple
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- Rademacher, Tim (författare)
- University of Quebec at Chicoutimi,Northern Arizona University,Harvard University
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- Fonti, Patrick (författare)
- Swiss Federal Institute for Forest, Snow and Landscape Research
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- LeMoine, James M (författare)
- Northern Arizona University
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- Fonti, Marina V (författare)
- Swiss Federal Institute for Forest, Snow and Landscape Research,Siberian Federal University
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- Bowles, Francis (författare)
- Research Designs
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- Chen, Yizhao (författare)
- University of Cambridge
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- Eckes-Shephard, Annemarie H (författare)
- Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,MERGE: ModElling the Regional and Global Earth system,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science,University of Cambridge
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- Friend, Andrew D (författare)
- University of Cambridge
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- Richardson, Andrew D (författare)
- Northern Arizona University
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(creator_code:org_t)
- 2022-08-22
- 2022
- Engelska 14 s.
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Ingår i: New Phytologist. - : Wiley. - 1469-8137 .- 0028-646X. ; 236:4, s. 1296-1309
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http://dx.doi.org/10...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi -- Annan biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Other Biological Topics (hsv//eng)
Nyckelord
- anatomy
- growth
- nonstructural carbon
- phloem
- sink
- source
- wood
- xylogenesis
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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