Stem Compression: A Means to Reversibly Reduce Phloem Transport in Tree Stems

Henriksson, Nils; Rademacher, Tim

doi:10.1007/978-1-4939-9562-2_24

Cited by 2 publications

(6 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We did not seal or treat the wounds but subsequent callus growth was not sufficient to bridge the girdle in 2017. For the single compression treatment (hereafter “compression treatment”), collars were constructed from two ratcheted heavy‐duty cargo belts with ratchets diametrically opposite each other as described in (Henriksson & Rademacher, 2019). Compression collars were removed after 36 days (10th August).…”

Section: Methodsmentioning

confidence: 99%

“…The objective of our study is to investigate how carbon supply controls wood formation in stems of mature trees during high carbon demand under similar environmental and phenological conditions. We applied phloem girdling and compression to restrict carbon flow along the stem by cutting or exerting theoretically sufficient pressure to collapse phloem tissues around the stem (Henriksson & Rademacher, 2019). To test whether local carbon dynamics change, when a stem section is isolated from both canopy carbon supply and distal nonstructural carbon reserves (i.e., roots), we also included a double compression treatment.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Rademacher

Fonti

LeMoine

et al. 2021

Plant Cell & Environment

View full text Add to dashboard Cite

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, CO 2 efflux and nonstructural carbon reserves in stems of mature white pines. Wood formation and stem CO 2 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.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Rademacher

Fonti

LeMoine

et al. 2021

Plant Cell & Environment

View full text Add to dashboard Cite

show abstract

“…We suspect that this discrepancy in recovery is caused by our experiment starting later in the growing season, thus allowing only a smaller opportunity for re-growth and/or recovery of the phloem. The compression collar design used here also exerted slightly higher pressure around the circumference (Henriksson and Rademacher, 2019), which may have contributed to the longer observed recovery times and continued effects in double compressed trees on radial growth in the following growing season.…”

Section: Discussionmentioning

confidence: 99%

“…We did not seal or treat the wounds. For the single compression treatment (hereafter compression treatment), collars were constructed from two ratcheted heavy-duty cargo belts with ratchets diametrically opposite each other as described in (Henriksson and Rademacher, 2019). Compression collars were removed after 36 days (10 th August) to allow for potential recovery within the same growing season.…”

Section: Methodsmentioning

confidence: 99%

“…In this study, we aim to investigate controls on structural carbon integration at the sink location in stems of mature trees while monitoring CO 2 efflux and variation in nonstructural carbon. In particular, we applied phloem girdling and compression to restrict carbon flow along the stem by cutting or exerting theoretically sufficient pressure to collapse phloem tissues around the stem (Henriksson and Rademacher, 2019) . These restrictions can generate a large contrast in local carbon supply without affecting light, temperature, water availability, or nutrient availability for the whole tree.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Rademacher

Fonti

LeMoine

et al. 2020

Preprint

View full text Add to dashboard Cite

Wood formation is a crucial process for carbon sequestration on land, yet how variations in phloem-transported carbon affect wood formation, respiration and nonstructural carbon pools remains poorly understood. To better understand the role of carbon supply on allocation to wood formation, we constrained phloem transport using girdling and compression around the stem of 40 mature white pines to monitor the effects of contrasting carbon supply (enriched above and reduced below the manipulations) on local wood formation and respiration, as well as on nonstructural carbon pools in needles, stems, and roots. Radial growth and respiration responded to variations in carbon supply. Despite a two-fold difference in the number of tracheids formed above and below the manipulation, cell-wall area only decreased slightly and cell size did not change noticeably. Surprisingly, nonstructural carbon pools and concentrations in the xylem, needles and roots remained largely unchanged, although starch reserves were remobilised and accumulated slightly under the most extreme decreases or increases in carbon supply, respectively. We conclude that phloem carbon supply does not affect nonstructural carbon concentrations but regulates growth and respiration in mature white pine. Thus, wood formation is controlled by the availability of phloem-transported carbon over timescales of several months.

show abstract

Stem Compression: A Means to Reversibly Reduce Phloem Transport in Tree Stems

Cited by 2 publications

References 14 publications

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

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

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

Contact Info

Product

Resources

About