The role of defoliation and root rot pathogen infection in driving the mode of drought-related physiological decline in Scots pine (Pinus sylvestris L.)

Aguadé, David; Poyatos, Rafael; Gómez, Miguel; Oliva, Jonàs; Martínez‐Vilalta, Jordi

doi:10.1093/treephys/tpv005

Cited by 69 publications

(62 citation statements)

References 52 publications

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“…In the mixed stand these minimum values were 5.21%, 4.52%, and 1.22% dry matter in P. sylvestris leaves, branches, and roots, respectively. Finally, NSC concentrations were 4.36%, 4.25%, and 14.09% in Q. ilex leaves, branches, and lignotuber, respectively, in the pure oak stand (see also Aguadé et al [30] and Rosas et al [42].…”

Section: Non-structural Carbohydrates and Starchmentioning

confidence: 90%

“…All studied variables and the years of each measurement are summarized in Table 2. The detailed methodologies used to measure each variable are described in Poyatos et al [28], Rosas et al [42], and Aguadé et al [30] and are summarized in the following sections. The trees included in this study partially overlap with those included in the previous references, although we also include unpublished measurements for pure stands of P. sylvestris and for Q. ilex trees in the Tillar Valley.…”

Section: Sampling Schemementioning

confidence: 99%

“…P50 and a values were obtained from vulnerability curves established on roots and branches using the dehydration (Q. ilex; [47]) and air-injection methods (P. sylvestris; [30]) for individuals from the same populations studied here. Values of P to estimate PLC were obtained from measured water potentials (ΨMD for branch PLC and ΨPD for root PLC).…”

Section: Percentage Loss Of Hydraulic Conductivitymentioning

confidence: 99%

“…Values of P to estimate PLC were obtained from measured water potentials (ΨMD for branch PLC and ΨPD for root PLC). All sampling methods and vulnerability curve measurements are detailed in Aguadé et al [30] and Martínez-Vilalta et al [47]. Since there is controversy regarding the best method for establishing vulnerability curves, particularly for species with long vessels such as Q. ilex, we also estimated PLC using the vulnerability curve coefficients (a and P50) estimated in another study comparing several methods to establish vulnerability curves in Q. ilex [48], which obtained higher embolism resistance than the study cited above [47] that was conducted at our study site.…”

Section: Percentage Loss Of Hydraulic Conductivitymentioning

confidence: 99%

“…P. sylvestris roots and Q. ilex lignotuber were considered "belowground organs" in all analyses and stands of NSC data. Field and laboratory methods were identical in all cases; more detailed information of sampling design and NSC analyses can be found in Aguadé et al [30] and Rosas et al [42]. Total non-structural carbohydrates (TNSC) were considered as including free sugars (glucose and fructose); sucrose and starch and were analyzed following the procedures described by Hoch et al [49] with some minor variations [31].…”

Section: Non-structural Carbohydratesmentioning

confidence: 99%

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Comparative Drought Responses of Quercus ilex L. and Pinus sylvestris L. in a Montane Forest Undergoing a Vegetation Shift

Aguadé

Poyatos

Rosas

et al. 2015

Forests

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Different functional and structural strategies to cope with water shortage exist both within and across plant communities. The current trend towards increasing drought in many regions could drive some species to their physiological limits of drought tolerance, potentially leading to mortality episodes and vegetation shifts. In this paper, we study the drought responses of Quercus ilex and Pinus sylvestris in a montane Mediterranean forest where the former species is replacing the latter in association with recent episodes of drought-induced mortality. Our aim was to compare the physiological responses to variations in soil water content (SWC) and vapor pressure deficit (VPD) of the two species when living together in a mixed stand or separately in pure stands, where the canopies of both species are completely exposed to high radiation and VPD. P. sylvestris showed typical isohydric behavior, with greater losses of stomatal conductance with declining SWC and greater reductions of stored non-structural carbohydrates during drought, consistent with carbon starvation being an important factor in the mortality of this species. On the other hand, Q. ilex trees showed a more anisohydric behavior, experiencing more negative water potentials and higher levels of xylem embolism under extreme drought, presumably putting them at higher risk of hydraulic failure. In addition, our results show relatively small changes in the physiological responses of Q. ilex in mixed vs. pure stands, suggesting that the current OPEN ACCESSForests 2015, 6 2506 replacement of P. sylvestris by Q. ilex will continue.

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Section: Non-structural Carbohydrates and Starchmentioning

confidence: 90%

Section: Sampling Schemementioning

confidence: 99%

Section: Percentage Loss Of Hydraulic Conductivitymentioning

confidence: 99%

Section: Percentage Loss Of Hydraulic Conductivitymentioning

confidence: 99%

Section: Non-structural Carbohydratesmentioning

confidence: 99%

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Comparative Drought Responses of Quercus ilex L. and Pinus sylvestris L. in a Montane Forest Undergoing a Vegetation Shift

Aguadé

Poyatos

Rosas

et al. 2015

Forests

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Dynamics of non‐structural carbohydrates in terrestrial plants: a global synthesis

Martínez‐Vilalta

Sala

Asensio

et al. 2016

Ecological Monographs

533

446

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Plants store large amounts of non-structural carbohydrates (NSC). While multiple functions of NSC have long been recognized, the interpretation of NSC seasonal dynamics is often based on the idea that stored NSC is a reservoir of carbon that fluctuates depending on the balance between supply via photosynthesis and demand for growth and respiration (the source-sink dynamics concept). Consequently, relatively high NSC concentrations in some plants have been interpreted to reflect excess supply relative to demand. An alternative view, however, is that NSC accumulation reflects the relatively high NSC levels required for plant survival; an important issue that remains highly controversial. Here, we assembled a new global database to examine broad patterns of seasonal NSC variation across organs (leaves, stems, and belowground), plant functional types (coniferous, drought-deciduous angiosperms, winter deciduous angiosperms, evergreen angiosperms, and herbaceous) and biomes (boreal, temperate, Mediterranean, and tropical). We compiled data from 121 studies, including seasonal measurements for 177 species under natural conditions. Our results showed that, on average, NSC account for ~10% of dry plant biomass and are highest in leaves and lowest in stems, whereas belowground organs show intermediate concentrations. Total NSC, starch, and soluble sugars (SS) varied seasonally, with a strong depletion of starch during the growing season and a general increase during winter months, particularly in boreal and temperate biomes. Across functional types, NSC concentrations were highest and most variable in herbaceous species and in conifer needles. Conifers showed the lowest stem and belowground NSC concentrations. Minimum NSC values were relatively high (46% of seasonal maximums on average for total NSC) and, in contrast to average values, were similar among biomes and functional types. Overall, although starch depletion was relatively common, seasonal depletion of total NSC or SS was rare. These results are consistent with a dual view of NSC function: whereas starch acts mostly as a reservoir for future use, soluble sugars perform immediate functions (e.g., osmoregulation) and are kept above some critical threshold. If confirmed, this dual function of NSC will have important implications for the way we understand and model plant carbon allocation and survival under stress.

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Forest Disease Affecting Pines in the Mediterranean Basin

Oliva

2021

Pines and Their Mixed Forest Ecosystems in the Mediterranean Basin

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The role of defoliation and root rot pathogen infection in driving the mode of drought-related physiological decline in Scots pine (Pinus sylvestris L.)

Abstract: The role of defoliation and root rot pathogen infection in 1 driving the mode of drought-related physiological decline in 2 Scots pine (Pinus sylvestris L.

Cited by 69 publications

References 52 publications

Comparative Drought Responses of Quercus ilex L. and Pinus sylvestris L. in a Montane Forest Undergoing a Vegetation Shift

Comparative Drought Responses of Quercus ilex L. and Pinus sylvestris L. in a Montane Forest Undergoing a Vegetation Shift

Dynamics of non‐structural carbohydrates in terrestrial plants: a global synthesis

Forest Disease Affecting Pines in the Mediterranean Basin

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