The 18 O-signal transfer from water vapour to leaf water and assimilates varies among plant species and growth forms

Lehmann Marco M., Goldsmith Gregory R., Mirande-Ney Cathleen, Weigt Rosemarie B., Schönbeck Leonie, Kahmen Ansgar, Gessler Arthur, Siegwolf Rolf T.W., Saurer Matthias. 2020. The 18 O-signal transfer from water vapour to leaf water and assimilates varies among plant species and growth forms. Plant, Cell and Environment, 43 (2) : 510-523.

Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : The 18O signature of atmospheric water vapour (δ18OV) is known to be transferred via leaf water to assimilates. It remains, however, unclear how the 18O-signal transfer differs among plant species and growth forms. We performed a 9-hr greenhouse fog experiment (relative humidity ≥ 98%) with 18O-depleted water vapour (−106.7‰) on 140 plant species of eight different growth forms during daytime. We quantified the 18O-signal transfer by calculating the mean residence time of O in leaf water (MRTLW) and sugars (MRTSugars) and related it to leaf traits and physiological drivers. MRTLW increased with leaf succulence and thickness, varying between 1.4 and 10.8 hr. MRTSugars was shorter in C3 and C4 plants than in crassulacean acid metabolism (CAM) plants and highly variable among species and growth forms; MRTSugars was shortest for grasses and aquatic plants, intermediate for broadleaf trees, shrubs, and herbs, and longest for conifers, epiphytes, and succulents. Sucrose was more sensitive to δ18OV variations than other assimilates. Our comprehensive study shows that plant species and growth forms vary strongly in their sensitivity to δ18OV variations, which is important for the interpretation of δ18O values in plant organic material and compounds and thus for the reconstruction of climatic conditions and plant functional responses.

Mots-clés Agrovoc : croissance, port de la plante, plante grasse, translocation, réponse de la plante

Mots-clés libres : Carbohydrates, Clouds, Compound-specific isotope analysis (CSIA), Fog, Foliar water uptak, Leaf wetting, Precipitation, Rain

Agences de financement hors UE : Swiss National Science Foundation

Auteurs et affiliations

• Lehmann Marco M., WSL (CHE) - auteur correspondant
• Goldsmith Gregory R., Chapman University (USA)
• Mirande-Ney Cathleen, CIRAD-PERSYST-UPR Systèmes de pérennes (FRA)
• Weigt Rosemarie B., WSL (CHE)
• Schönbeck Leonie, WSL (CHE)
• Kahmen Ansgar, University of Basel (CHE)
• Gessler Arthur, WSL (CHE)
• Siegwolf Rolf T.W., WSL (CHE)
• Saurer Matthias, WSL (CHE)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/605361/)

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