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The Hydrogen Isotope Composition δ2H Reflects Plant Performance
Rut Sanchez-Bragado1, Maria Dolors Serret1, Rosa Maria Marimon2
1Secció de Fisiologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Barcelona and AGROTECNIO (Centre for Research in Agrotechnology), Lleida, Spain 08028.
Plant Physiology
|April 7, 2019
Summary
Hydrogen isotope composition (δ²H) in wheat reveals plant water status and photosynthetic activity. This study shows δ²H can assess crop performance and grain yield under varying field conditions.
Area of Science:
- Plant Physiology
- Stable Isotope Geochemistry
- Agricultural Science
Background:
- Stable carbon (δ¹³C) and oxygen (δ¹⁸O) isotopes in plants indicate photosynthetic and transpirative conditions.
- The role of hydrogen isotope composition (δ²H) in reflecting plant performance remains poorly understood.
- Understanding δ²H dynamics is crucial for interpreting plant physiological responses to environmental factors.
Purpose of the Study:
- To investigate the effect of water and nitrogen conditions on transpiration and its influence on δ²H in different durum wheat organs.
- To compare δ²H with δ¹³C and δ¹⁸O in autotrophic, mixotrophic, and heterotrophic plant tissues.
- To explore the potential of δ²H as a biomarker for plant performance and water status.
Main Methods:
- Analysis of stable isotope compositions (δ²H, δ¹³C, δ¹⁸O) in dry matter, water-soluble fractions, and tissue water of durum wheat (Triticum turgidum var. durum).
- Evaluation of plant responses under varied water and nitrogen field conditions.
- Correlation analysis between isotope compositions, stomatal conductance, and physiological parameters.
Main Results:
- δ²H negatively correlated with stomatal conductance, similar to δ¹³C, but unlike δ¹⁸O.
- δ²H was influenced by both transpiration and photosynthetic reactions, particularly NADPH formation.
- Significant δ²H variations were observed across different organs: diminished in flag leaves, enriched in grains and roots.
- δ²H in heterotrophic organs was linked to post-photosynthetic carbohydrate enrichment processes.
- δ²H showed correlations with grain yield, indicating its utility in assessing plant performance.
Conclusions:
- δ²H provides specific insights into wheat crop water conditions and plant part-specific photosynthetic characteristics.
- δ²H is a valuable tool for assessing plant performance and yield under diverse growing conditions.
- The study elucidates the complex behavior of δ²H in plants, expanding its application in agricultural and environmental research.
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