Article Dans Une Revue Plant, Cell and Environment Année : 2019

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

Résumé

The 18 O signature of atmospheric water vapour (δ 18 O V ) is known to be transferred via leaf water to assimilates. It remains, however, unclear how the 18 O-signal transfer differs among plant species and growth forms. We performed a 9-hr greenhouse fog experiment (relative humidity ≥ 98%) with 18 O-depleted water vapour (-106.7‰) on 140 plant species of eight different growth forms during daytime. We quantified the 18 O-signal transfer by calculating the mean residence time of O in leaf water (MRT LW ) and sugars (MRT Sugars ) and related it to leaf traits and physiological drivers. MRT LW increased with leaf succulence and thickness, varying between 1.4 and 10.8 hr.

MRT Sugars was shorter in C 3 and C 4 plants than in crassulacean acid metabolism (CAM) plants and highly variable among species and growth forms; MRT Sugars 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 δ 18 O V variations than other assimilates. Our comprehensive study shows that plant species and growth forms vary strongly in their sensitivity to δ 18 O V variations, which is important for the interpretation of δ 18 O values in plant organic material and compounds and thus for the reconstruction of climatic conditions and plant functional responses

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Dates et versions

hal-04901766 , version 1 (20-01-2025)

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Marco M Lehmann, Gregory R Goldsmith, Cathleen Mirande‐ney, Rosemarie B Weigt, Leonie Schönbeck, et al.. The 18 O‐signal transfer from water vapour to leaf water and assimilates varies among plant species and growth forms. Plant, Cell and Environment, 2019, 43 (2), pp.510 - 523. ⟨10.1111/pce.13682⟩. ⟨hal-04901766⟩
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