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During drought, xylem sap pressures can approach or exceed critical thresholds where gas embolisms form and propagate through the xylem network, leading to systemic hydraulic dysfunction. The vulnerability segmentation hypothesis (VSH) predicts that low‐investment organs (e.g. leaf petioles) should be more vulnerable to embolism spread compared to high‐investment, perennial organs (e.g. trunks,...
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