Thresholds for persistent leaf photochemical damage predict plant drought resilience in a tropical rainforest - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles New Phytologist Year : 2023

Thresholds for persistent leaf photochemical damage predict plant drought resilience in a tropical rainforest

Clément Stahl
Sabrina Coste
Camille Ziegler
Damien Bonal
Fabien H Wagner
Lawren Sack
Jérôme Chave
Grace John
Santiago Trueba
Megan K Bartlett

Abstract

Water stress can cause declines in plant function that persist after rehydration. Recent work has defined ‘resilience’ traits characterizing leaf resistance to persistent damage from drought, but whether these traits predict resilience in whole-plant function is unknown. It is also unknown whether the coordination between resilience and ‘resistance’ – the ability to maintain function during drought – observed globally occurs within ecosystems. For eight rainforest species, we dehydrated and subsequently rehydrated leaves, and measured water stress thresholds for declines in rehydration capacity and maximum quantum yield of photosystem II (Fv/Fm). We tested correlations with embolism resistance and dry season water potentials (ΨMD), and calculated safety margins for damage (ΨMD – thresholds) and tested correlations with drought resilience in sap flow and growth. Ψ thresholds for persistent declines in Fv/Fm, indicating resilience, were positively correlated with ΨMD and thresholds for leaf vein embolism. Safety margins for persistent declines in Fv/Fm, but not rehydration capacity, were positively correlated with drought resilience in sap flow. Correlations between resistance and resilience suggest that species' differences in performance during drought are perpetuated after drought, potentially accelerating shifts in forest composition. Resilience to photochemical damage emerged as a promising functional trait to characterize whole-plant drought resilience.
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hal-04133784 , version 1 (20-06-2023)

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Claire Fortunel, Clément Stahl, Sabrina Coste, Camille Ziegler, Géraldine Derroire, et al.. Thresholds for persistent leaf photochemical damage predict plant drought resilience in a tropical rainforest. New Phytologist, 2023, 239 (2), pp.576-591. ⟨10.1111/nph.18973⟩. ⟨hal-04133784⟩
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