Differential effects of drought on nonstructural carbohydrate storage in seedlings and mature trees of four species in a subtropical forest

Zhang, Peipei; Zhou, Xuhui; Fu, Yuzhen; Shao, Junjiong; Zhou, Lingyan; Li, Songsong; Hu, Zhenhong; Hu, Jiaqi; Bai, Shahla Hosseini; McDowell, Nate G.

doi:10.1016/j.foreco.2020.118159

Cited by 30 publications

(20 citation statements)

References 71 publications

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“…The observed stable soluble sugar concentrations across treatments add to previous evidence that nonstructural carbon concentrations follow relatively constrained seasonal cycles in the wood of mature trees (Zhang et al, 2020). Soluble sugar concentrations seem to be generally maintained to follow a specific seasonal rhythm.…”

Section: Discussionsupporting

confidence: 82%

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

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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.

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Section: Discussionsupporting

confidence: 82%

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

“…8). Similar NSC phenomena across drought trees have already been shown in some regions (Anderegg et al 2012;Adams et al 2013Adams et al , 2018Dickman et al 2014;Zhang et al 2020). The maintenance of NSC concentrations during drought conditions suggested that the sustainability of growth during drought did not occur at the expense of depleted carbon stores.…”

Section: Nsc During the Droughtsupporting

confidence: 78%

Seasonal Drought Induces Hydraulic Dysfunction, Not Carbohydrate Depletion, for Robinia Pseudoacacia in a Semi-humid Forest

Qingyin

Jia

Shao

2021

Preprint

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BackgroundShifts in rainfall patterns that are associated with climate change are likely to cause widespread forest decline in regions where droughts are predicted to increase in duration and severity. However, causes of forest decline and their physiological mechanisms remain unclear, particularly the roles of carbon metabolism and xylem function. To explore the response of hydraulic architecture and non-structural carbohydrates (NSC) traits under seasonal drought, we conducted a manipulation experiment in a Robinia pseudoacacia plantation in 2015 and 2016 in Loess Plateau of China. Sap-flow, leaf area index, water potential, non-structural carbohydrate concentrations, and hydraulics in different organs were measured. ResultsThe mean pre-dawn and midday leaf water potential after two growing seasons of drought stress was significantly lower (-2.2 MPa and -2.7 MPa, respectively) than those of control trees (-1.5 MPa and -2.0 MPa, respectively). Drought stress accelerated the loss of conductivity, and promoted the formation of narrow hydraulic safety margins, which indicated that hydraulic failure could be a good predictor of “physiological drought” in trees when subjected to two growing seasons of drought. Both sugar and starch concentrations in stems and roots were similar in all trees throughout the drought period, which indicated that trees maintained good coordination between carbon supply and demand when confronted with two growing seasons of drought.ConclusionsOur results emphasized that hydraulic failure plays the predominant role in causing tree death during highly intense drought, while whether "carbon starvation" occurs during tree mortality remains to be tested in longer (multi-year) but less intense drought.

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“…When plants undergo drought stress, the stored NSCs can be used as a buffer to temporarily supply plants for their growth and metabolism ( Dietze et al, 2014 ). In recent years, the different responses of NSCs among different plant tissues or organs under drought stress have been discussed deeply ( Martínez-Vilalta et al, 2016 ; Furze et al, 2019 ; Deng et al, 2020 ; He et al, 2020 ; Zhang et al, 2020 ). Many studies have found that the NSC concentration in root tissue is highest except for the trunk, which has an important impact on the storage and distribution of NSCs in trees ( Dietze et al, 2014 ; Mei et al, 2015 ; Ji et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Differential Variation in Non-structural Carbohydrates in Root Branch Orders of Fraxinus mandshurica Rupr. Seedlings Across Different Drought Intensities and Soil Substrates

Liu

Jun

et al. 2021

Front. Plant Sci.

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Non-structural carbohydrates (NSCs) facilitate plant adaptation to drought stress, characterize tree growth and survival ability, and buffer against external disturbances. Previous studies have focused on the distribution and dynamics of NSCs among different plant organs under drought conditions. However, discussion about the NSC levels of fine roots in different root branch orders is limited, especially the relationship between fine root trait variation and NSC content. The objective of the study was to shed light on the synergistic variation in fine root traits and NSC content in different root branch orders under different drought and soil substrate conditions. The 2-year-old Fraxinus mandshurica Rupr. potted seedlings were planted in three different soil substrates (humus, loam, and sandy–loam soil) and subjected to four drought intensities (CK, mild drought, moderate drought, and severe drought) for 2 months. With increasing drought intensity, the biomass of fine roots decreased significantly. Under the same drought intensity, seedlings in sandy–loam soil had higher root biomass, and the coefficient of variation of 5th-order roots (37.4, 44.5, and 53% in humus, loam, and sandy–loam soil, respectively) was higher than that of lower-order roots. All branch order roots of seedlings in humus soil had the largest specific root length (SRL) and specific root surface area (SRA), in addition to the lowest diameter. With increasing drought intensity, the SRL and average diameter (AD) of all root branch orders increased and decreased, respectively. The fine roots in humus soil had a higher soluble sugar (SS) content and lower starch (ST) content compared to the loam and sandy–loam soil. Additionally, the SS and ST contents of fine roots showed decreasing and increasing tendencies with increasing drought intensities, respectively. SS and ST explained the highest degree of the total variation in fine root traits, which were 32 and 32.1%, respectively. With increasing root order, the explanation of the variation in root traits by ST decreased (only 6.8% for 5th-order roots). The observed response in terms of morphological traits of different fine root branch orders of F. mandshurica seedlings to resource fluctuations ensures the maintenance of a low cost-benefit ratio in the root system development.

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Differential effects of drought on nonstructural carbohydrate storage in seedlings and mature trees of four species in a subtropical forest

Cited by 30 publications

References 71 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

Seasonal Drought Induces Hydraulic Dysfunction, Not Carbohydrate Depletion, for Robinia Pseudoacacia in a Semi-humid Forest

Differential Variation in Non-structural Carbohydrates in Root Branch Orders of Fraxinus mandshurica Rupr. Seedlings Across Different Drought Intensities and Soil Substrates

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