Dataset Information

Cellulose (delta)18O is an index of leaf-to-air vapor pressure difference (VPD) in tropical plants.

ABSTRACT: Cellulose in plants contains oxygen that derives in most cases from precipitation. Because the stable oxygen isotope composition, ?(18)O, of precipitation is associated with environmental conditions, cellulose ?(18)O should be as well. However, plant physiological models using ?(18)O suggest that cellulose ?(18)O is influenced by a complex mix of both climatic and physiological drivers. This influence complicates the interpretation of cellulose ?(18)O values in a paleo-context. Here, we combined empirical data analyses with mechanistic model simulations to i) quantify the impacts that the primary climatic drivers humidity (e(a)) and air temperature (T(air)) have on cellulose ?(18)O values in different tropical ecosystems and ii) determine which environmental signal is dominating cellulose ?(18)O values. Our results revealed that e(a) and T(air) equally influence cellulose ?(18)O values and that distinguishing which of these factors dominates the ?(18)O values of cellulose cannot be accomplished in the absence of additional environmental information. However, the individual impacts of e(a) and T(air) on the ?(18)O values of cellulose can be integrated into a single index of plant-experienced atmospheric vapor demand: the leaf-to-air vapor pressure difference (VPD). We found a robust relationship between VPD and cellulose ?(18)O values in both empirical and modeled data in all ecosystems that we investigated. Our analysis revealed therefore that ?(18)O values in plant cellulose can be used as a proxy for VPD in tropical ecosystems. As VPD is an essential variable that determines the biogeochemical dynamics of ecosystems, our study has applications in ecological-, climate-, or forensic-sciences.

SUBMITTER: Kahmen A

PROVIDER: S-EPMC3033288 | biostudies-literature | 2011 Feb

REPOSITORIES: biostudies-literature

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Cellulose (delta)18O is an index of leaf-to-air vapor pressure difference (VPD) in tropical plants.

Kahmen Ansgar A Sachse Dirk D Arndt Stefan K SK Tu Kevin P KP Farrington Heraldo H Vitousek Peter M PM Dawson Todd E TE

Proceedings of the National Academy of Sciences of the United States of America 20110118 5

Cellulose in plants contains oxygen that derives in most cases from precipitation. Because the stable oxygen isotope composition, δ(18)O, of precipitation is associated with environmental conditions, cellulose δ(18)O should be as well. However, plant physiological models using δ(18)O suggest that cellulose δ(18)O is influenced by a complex mix of both climatic and physiological drivers. This influence complicates the interpretation of cellulose δ(18)O values in a paleo-context. Here, we combined ...[more]

PMID: 21245322

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Project description:Plant surfaces are known as an important sink for various air pollutants, including particulate matter and its associated potentially toxic elements (PTE). Moreover, leaves surface or phylloplane is a habitat that harbors diverse bacterial communities (epiphytic). However, little is known about their possible functions during phytoremediation of air pollutants like PTE. The study of leaf epiphytic bacteria of plants colonizing mine residues (MR) containing PTE is thus a key to understand and exploit plant-epiphytic bacteria interactions for air phytoremediation purposes. In this research, we aimed (i) to characterize the functions of epiphytic bacteria isolated from the phylloplane of Brickellia veronicifolia, Flaveria trinervia, Gnaphalium sp., and Allionia choisyi growing spontaneously on multi-PTE contaminated MR and (ii) to compare these against the same plant species in a non-polluted control site (NC). Concentrations (mg kg-1) of PTE on MR leaf surfaces of A. choisyi reached up to 232 for Pb, 13 for Cd, 2,728 for As, 52 for Sb, 123 for Cu in F. trinervia, and 269 for Zn in Gnaphalium sp. In the four plant species, the amount of colony-forming units per cm2 was superior in MR leaves than in NC ones, being A. choisyi the plant species with the highest value. Moreover, the proportion of isolates tolerant to PTE (Zn, Cu, Cd, and Sb), UV light, and drought was higher in MR leaves than in those in NC. Strain BA15, isolated from MR B. veronicifolia, tolerated 150 mg Zn L-1, 30 mg Sb L-1, 25 mg Cu L-1; 80 mg Pb L-1, and was able to grow after 12 h of continuous exposition to UV light and 8 weeks of drought. Plant growth promotion related traits [N fixation, indole acetic acid (IAA) production, and phosphate solubilization] of bacterial isolates varied among plant species isolates and between MR and NC sampling condition. The studied epiphytic isolates possess functions interesting for phytoremediation of air pollutants. The results of this research may contribute to the development of novel and more efficient inoculants for microbe-assisted phytoremediation applied to improve air quality in areas exposed to the dispersion of metal mine tailings.

Dataset Information

Cellulose (delta)18O is an index of leaf-to-air vapor pressure difference (VPD) in tropical plants.

Publications

Cellulose (delta)18O is an index of leaf-to-air vapor pressure difference (VPD) in tropical plants.

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