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Carbon dynamics under drought and recovery in grapevine's leaves
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  • Aviad Perry,
  • * Sperling,
  • Shimon Rachmilevitch,
  • Uri Hochberg
Aviad Perry
Ben-Gurion University of the Negev
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* Sperling
Agricultural Research Organization
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Shimon Rachmilevitch
Ben-Gurion University of the Negev French Associates Institute for Agriculture and Biotechnology of Drylands
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Uri Hochberg
Agricultural Research Organization

Corresponding Author:[email protected]

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Abstract

Drought stress reduces leaf net assimilation (A N) and phloem export, but the equilibrium between the two is unknown. Consequently, the leaf carbon balance and the primary use of the leaf nonstructural carbohydrates (NSC) under water deficit are unclear. Also, we do not know how quickly leaves can replenish their NSC storage and resume export after rehydration. Hence, we dried grapevines to either zero A N, turgor loss, or complete wilting while following the leaf carbon dynamics. The vines ceased growth and minimized carbon export under drought, conserving the leaves NSC until A N zeroed. Subsequently, the leaves slowly depleted their NSC storage. However, the NSC depletion rate in the leaves was too slow to support the leaf’s energetic requirements, probably transforming the leaves into carbon sinks. Even under extreme drought (-2 MPa), the leaves had substantial NSC reserves (38% of the controls). After rehydration, all surviving leaves recovered their NSC storage within a week, and even leaves that were later shed had functional phloem export in the week after rehydration. The study reveals the leaf carbon relations under drought, highlighting the preference of the leaf to conserve its NSC storage rather than utilize it.
06 Jun 2024Submitted to Plant, Cell & Environment
09 Jun 2024Review(s) Completed, Editorial Evaluation Pending
11 Jun 2024Reviewer(s) Assigned
29 Jul 2024Editorial Decision: Revise Minor
11 Sep 20241st Revision Received
13 Sep 2024Submission Checks Completed
13 Sep 2024Assigned to Editor
15 Sep 2024Review(s) Completed, Editorial Evaluation Pending
17 Sep 2024Reviewer(s) Assigned
31 Oct 2024Editorial Decision: Revise Minor