Temperature and water potential co‐limit stem cambial activity along a steep elevational gradient

Cabon, Antoine; Peters, Richard L.; Fonti, Patrick; Martínez‐Vilalta, Jordi; Cáceres, Miquel De

doi:10.1111/nph.16456

Cited by 93 publications

(71 citation statements)

References 116 publications

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“…However, high temperatures probably act together with low precipitation to cause the observed drought-induced cessation or slowing of wood formation (Cabon et al, 2020; also seen in our soil moisture simulations), similar to Mediterranean systems (Cabon et al, 2018;Lempereur et al, 2017). Another indirect effect of temperature may have been to act on stem water potential via the influence on vapour pressure deficit.…”

Section: Mechanisms and Drivers Involved In Growth Increment Dynamicssupporting

confidence: 66%

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Direct response of tree growth to soil water and its implications for terrestrial carbon cycle modelling

Eckes-Shephard

Tiavlovsky²,

Chen

et al. 2020

Global Change Biology

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Section: Mechanisms and Drivers Involved In Growth Increment Dynamicssupporting

confidence: 66%

“…Indeed, it has been suggested that ongoing climate warming in this area (King et al, 2013) has made this and nearby sites less sensitive to direct growth limitations by temperature (Cabon et al, 2020), with maybe the exception of growth onset (Cuny et al, 2019).…”

Section: Mechanisms and Drivers Involved In Growth Increment Dynamicsmentioning

confidence: 99%

Direct response of tree growth to soil water and its implications for terrestrial carbon cycle modelling

Eckes-Shephard

Tiavlovsky²,

Chen

et al. 2020

Global Change Biology

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“…Our analysis evidenced that LBM defoliation effects were not the same for all xylem functional traits. This indirectly indicates that xylogenesis phases of cambial division, cell enlargement, and cell wall thickening are differently affected not only by temperature and water (Castagneri et al, 2017;Cabon et al, 2020b), but also by carbon availability. Specifically, lumen size was reduced in the first two to three years of outbreak, but to a lesser extent than cell-wall thickness and cell number, confirming our initial hypothesis.…”

Section: Discussion Lbm Outbreak Effects On Cell Anatomical Featuresmentioning

confidence: 99%

Long-Term Impacts of Defoliator Outbreaks on Larch Xylem Structure and Tree-Ring Biomass

et al. 2020

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Defoliator insects are a major disturbance agent in many forests worldwide. During outbreaks, they can strongly reduce photosynthetic carbon uptake and impact tree growth. In the Alps, larch budmoth (Zeiraphera diniana) outbreaks affect European larch (Larix decidua) radial growth over several years. However, immediate and legacy effects on xylem formation, structure, and functionality are still largely unknown. In this study, we aimed at assessing the impact of budmoth defoliations on larch xylem anatomical features and tree-ring structure. Analyses were performed in the Lötschental (Swiss Alps) within (1,900 m a.s.l.) and above (2,200 m a.s.l.) the optimum elevational range of larch budmoth. We investigated variability of xylem anatomical traits along century-long treering series of larch (host) and Norway spruce (non-host) trees. We identified eight outbreaks affecting larch xylem anatomy during the 20 th century, particularly at 1,900 m a.s.l. Tracheid number always showed a higher percent reduction than properties of individual cells. Cell lumen size was slightly reduced in the first 2-3 years of outbreaks, especially in the early part of the ring. The more carbon-demanding cell wall was thinned along the entire ring, but more evidently in the last part. Theoretical tree-ring hydraulic conductivity was reduced for several years (up to 6), mostly due to cell number decrease. Reduced cell wall area and cell number resulted in a strong reduction of the tree-ring biomass, especially in the first year of outbreak. Our study shows that, under carbon source limitations caused by natural defoliation, cell division is more impacted than wall thickening and cell enlargement (the least affected process). Consequences on both xylem hydraulic properties and tree-ring biomass should be considered when assessing long-term defoliator effects on xylem functioning, forest dynamics, and terrestrial carbon cycle.

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“…2020b). Similarly, growth cessation in autumn may involve responses to day length (Baba et al 321 2011), temperature (Begum et al 2016), or even drought (Ziaco et al 2016, Cabon et al 2020b. 322…”

Section: Discussion 251mentioning

confidence: 99%

Modelling the spatial crosstalk between two biochemical signals explains wood formation dynamics and tree-ring structure

Hartmann

Rathgeber

Badel

et al. 2020

Preprint

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HighlightA dynamical model proves that two interacting signals (auxin, plus a cytokinin or the TDIF peptide) can drive wood formation dynamics and tree-ring structure development in conifers. AbstractIn conifers, xylogenesis produces during a growing season a very characteristic tree-ring structure: large thin-walled earlywood cells followed by narrow thick-walled latewood cells. Although many factors influence the dynamics of differentiation and the final dimensions of xylem cells, the associated patterns of variation remain very stable from one year to the next. While radial growth is characterised by an S-shaped curve, the widths of xylem differentiation zones exhibit characteristic skewed bell-shaped curves. These elements suggest a strong internal control of xylogenesis. It has long been hypothesised that much of this regulation relies on a morphogenetic gradient of auxin.However, recent modelling works have shown that while this hypothesis could account for the dynamics of stem radial growth and the zonation of the developing xylem, it failed to reproduce the characteristic tree-ring structure. Here we investigated the hypothesis of a regulation by a crosstalk between auxin and a second biochemical signal, using dynamical modelling. We found that, in conifers, such a crosstalk is sufficient to simulate the characteristic features of wood formation dynamics, as well as the resulting tree-ring structure. In this model, auxin controls cell enlargement rates while another signal (e.g., cytokinin, TDIF) drives cell division and auxin polar transport.

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Temperature and water potential co‐limit stem cambial activity along a steep elevational gradient

Cited by 93 publications

References 116 publications

Direct response of tree growth to soil water and its implications for terrestrial carbon cycle modelling

Direct response of tree growth to soil water and its implications for terrestrial carbon cycle modelling

Long-Term Impacts of Defoliator Outbreaks on Larch Xylem Structure and Tree-Ring Biomass

Modelling the spatial crosstalk between two biochemical signals explains wood formation dynamics and tree-ring structure

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