Shifts in carbon and nitrogen stable isotope composition and epicuticular lipids in leaves reflect early water-stress in vineyards

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Serval ID
serval:BIB_33D223A4789A
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Shifts in carbon and nitrogen stable isotope composition and epicuticular lipids in leaves reflect early water-stress in vineyards
Journal
Science of the Total Environment
Author(s)
Spangenberg J.E., Schweizer M., Zufferey V.
ISSN
0048-9697
ISSN-L
0048-9697
Publication state
Published
Issued date
10/2020
Peer-reviewed
Oui
Volume
739
Pages
140343
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
Changes in leaf carbon and nitrogen isotope composition (δ <sup>13</sup> C and δ <sup>15</sup> N values) and the accumulation of epicuticular lipids have been associated with plant responses to water stress. We investigated their potential use as indicators of early plant water deficit in two grapevine (Vitis vinifera L.) cultivars, Chasselas and Pinot noir, that were field-grown under well-watered and water-deficient conditions. We tested the hypothesis that the bulk δ <sup>13</sup> C and δ <sup>15</sup> N values and the concentrations of epicuticular fatty acids may change in leaves of similar age with the soil water availability. For this purpose, leaves were sampled at the same position in the canopy at different times (phenological stages) during the 2014 growing season. Bulk dry matter of young leaves from flowering to veraison had higher δ <sup>13</sup> C values, higher total nitrogen content, and lower δ <sup>15</sup> N values than old leaves. In both cultivars, δ <sup>15</sup> N values were strongly correlated with plant water deficiency, demonstrating their integration of the plant water stress response. δ <sup>13</sup> C values recorded the water deficiency only in those plants that had not received foliar organic fertilization. The soil water deficiency triggered the accumulation of C <sub>>26</sub> fatty acids in the cuticular waxes. The compound-specific isotope analysis (CSIA) of fatty acids from old leaves showed an increase in δ <sup>13</sup> C among the C <sub>16</sub> -C <sub>22</sub> chains, including stress signaling linoleic and linolenic acids. Our results provide evidence for leaf <sup>13</sup> C-enrichment, <sup>15</sup> N-depletion, and enhanced FA-chain elongation and epicuticular accumulation in the grapevine response to water stress. The leaf δ <sup>13</sup> C and δ <sup>15</sup> N values, and the concentration of epicuticular fatty acids can be used as reliable and sensitive indicators of plant water deficit even when the level of water stress is low to moderate. They could also be used, particularly the more cost-efficient δ <sup>13</sup> C and δ <sup>15</sup> N measurements, for periodic biogeochemical mapping of the plant water availability at the vineyard and regional scale.
Keywords
Environmental Engineering, Waste Management and Disposal, Pollution, Environmental Chemistry
Pubmed
Web of science
Open Access
Yes
Funding(s)
Swiss National Science Foundation
University of Lausanne
Create date
04/07/2020 8:23
Last modification date
28/10/2020 7:27
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