Species and biosynthetic effects cause uncorrelated variation in oxygen and hydrogen isotope compositions of plant organic compounds

Baan, Jochem; Holloway‐Phillips, Meisha; Nelson, Daniel B.; Kahmen, Ansgar

doi:10.1016/j.gca.2023.04.013

Cited by 3 publications

(2 citation statements)

References 71 publications

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“…The lack of environmental predictability to the hydrogen metabolic signal may reflect the shift in species identity across the aridity gradient, since species differences in cellulose δ 2 H values and biosynthetic isotope effects associated with source‐cell metabolism have recently been noted (Holloway‐Phillips et al ., 2022; Lehmann et al ., 2022; Baan et al ., 2023; Schuler et al ., 2023). Conversely, the trend towards increasing isotopic exchange of oxygen with water with increasing aridity may be supported by ecological knowledge of the sites, as suggested below.…”

Section: Discussionmentioning

confidence: 99%

“…Also, position‐specific intramolecular δ 2 H analysis has suggested different fractionation factors for individual H‐atom positions, which respond to environmental conditions (Schleucher et al ., 1999; Augusti et al ., 2006; Wieloch et al ., 2022a,b). Variation in the isotopic offset between cellulose δ 2 H and plant water pools also supports the view that fractionation factors can change with species and growth conditions (Sternberg & Deniro, 1983; Cormier et al ., 2018, 2019; Baan et al ., 2022, 2023; Lehmann et al ., 2022).…”

Section: Introductionmentioning

confidence: 99%

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Covariation between oxygen and hydrogen stable isotopes declines along the path from xylem water to wood cellulose across an aridity gradient

Holloway‐Phillips,

Cernusak,

Nelson

et al. 2023

New Phytologist

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Summary Oxygen and hydrogen isotopes of cellulose in plant biology are commonly used to infer environmental conditions, often from time series measurements of tree rings. However, the covariation (or the lack thereof) between δ18O and δ2H in plant cellulose is still poorly understood. We compared plant water, and leaf and branch cellulose from dominant tree species across an aridity gradient in Northern Australia, to examine how δ18O and δ2H relate to each other and to mean annual precipitation (MAP). We identified a decline in covariation from xylem to leaf water, and onwards from leaf to branch wood cellulose. Covariation in leaf water isotopic enrichment (Δ) was partially preserved in leaf cellulose but not branch wood cellulose. Furthermore, whilst δ2H was well‐correlated between leaf and branch, there was an offset in δ18O between organs that increased with decreasing MAP. Our findings strongly suggest that postphotosynthetic isotope exchange with water is more apparent for oxygen isotopes, whereas variable kinetic and nonequilibrium isotope effects add complexity to interpreting metabolic‐induced δ2H patterns. Varying oxygen isotope exchange in wood and leaf cellulose must be accounted for when δ18O is used to reconstruct climatic scenarios. Conversely, comparing δ2H and δ18O patterns may reveal environmentally induced shifts in metabolism.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Covariation between oxygen and hydrogen stable isotopes declines along the path from xylem water to wood cellulose across an aridity gradient

Holloway‐Phillips,

Cernusak,

Nelson

et al. 2023

New Phytologist

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Plant type effect overweighs seasonal variation in n-alkanoic acid biomarker on regional Loess Plateau of China

Liu,

Ladd,

Zhao

et al. 2024

Sci. China Earth Sci.

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Changes in plant physiology during cultivation periods influence the hydrogen isotope ratio of the water-insect relationship

Fujii,

Akiduki,

Yabusaki

et al. 2024

Preprint

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1. The hydrogen stable isotope ratios (δ2H) in tissues of terrestrial insects are widely applied to estimate natal origins in field populations. The hydrogen isotopes of insect tissues incorporate those of environmental waters through the insects′ metabolic processes. Water sources and abiotic environmental factors reflect changes in plant physiology, as indicated by the δ2H values of plants. However, the influence of plant physiology on the assimilation of hydrogen in insect tissues derived from water through feeding diets is still unknown. 2. We experimentally examined the influence of water on the δ2H values of maize leaf and of forewings ofMythimna separata(Lepidoptera: Noctuidae) andSpodoptera frugiperda(Noctuidae). We prepared five specific water samples for cultivating maize, aiming to replicate the gradient of δ2H values observed in environmental waters across the Japanese archipelago. 3. The mean-percentage contribution of water to hydrogen in maize leaves was 17.6% (July-August) and 25.1% (September-October). Linear analyses indicated that 17.4% and 32.7% of hydrogen inM. separataandS. frugiperdaforewings were derived from water through the consumption of maize leaves. The slope values of linear regression between the insect forewings and the maize leaves supplied in the final instar were closest to 1.0. These results indicated that the δ2H values of maize leaves and insect forewings reflected those of water resources. 4. This study presented the seasonal changes in climate conditions that affected the δ2H values of host plants and insect tissues. Changes in plant physiology with seasonal variations may influence the interpretation of the linear relationship between water and insect tissues on the estimation of natal origins.

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Species and biosynthetic effects cause uncorrelated variation in oxygen and hydrogen isotope compositions of plant organic compounds

Cited by 3 publications

References 71 publications

Covariation between oxygen and hydrogen stable isotopes declines along the path from xylem water to wood cellulose across an aridity gradient

Covariation between oxygen and hydrogen stable isotopes declines along the path from xylem water to wood cellulose across an aridity gradient

Plant type effect overweighs seasonal variation in n-alkanoic acid biomarker on regional Loess Plateau of China

Changes in plant physiology during cultivation periods influence the hydrogen isotope ratio of the water-insect relationship

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