ArticleFrontiers in plant science2026
Drought and heatwave synergy alters organ-level C:N stoichiometry and carbohydrate dynamics in subtropical tree seedlings.
Article in Frontiers in plant science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: Frequency and intensity of "hot droughts" are escalating globally, yet the physiological mechanisms governing tree resilience to the synergistic impacts of water deficiency and heatwaves remain poorly understood. Methods: Here, we investigated the dynamics of carbon (C), nitrogen (N), and non-structural carbohydrates (NSC) in leaves, stems, and roots of three subtropical tree seedlings ( Results: Our results demonstrate that combined stress triggers a "dual-deficit" mechanism-simultaneous cessation of carbon assimilation and accelerated respiratory consumption, as inferred from the significant depletion of organ-specific NSC pools-that exerts a more profound impact on NSC pools than on C-N stoichiometry. Structural equation modeling revealed a spatiotemporal division of labor where seedlings prioritize acute hydraulic safety by sacrificing foliar metabolic performance, incurring a delayed "metabolic debt" in roots that manifests as significant legacy effects during recovery. Discussion: Crucially, the three species exhibited divergent strategies to manage this metabolic capital:
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