A clear trade-off between leaf hydraulic efficiency and safety in an aridland shrub during regrowth

Guang Qian Yao, Zheng Fei Nie, Yuan Yuan Zeng, Muhammad Waseem, Md Mahadi Hasan, Xue Qian Tian, Zhong Qiang Liao, Kadambot H.M. Siddique, Xiang Wen Fang

Research output: Contribution to journalArticlepeer-review

Abstract

It has been suggested that a trade-off between hydraulic efficiency and safety is related to drought adaptation across species. However, whether leaf hydraulic efficiency is sacrificed for safety during woody resprout regrowth after crown removal is not well understood. We measured leaf water potential (ψleaf) at predawn (ψpd) and midday (ψmid), leaf maximum hydraulic conductance (Kleaf-max), ψleaf at induction 50% loss of Kleaf-max (Kleaf P50), leaf area-specific whole-plant hydraulic conductance (LSC), leaf vein structure and turgor loss point (πtlp) in 1- to 13-year-old resprouts of the aridland shrub (Caragana korshinskii). ψpd was similar, ψmid and Kleaf P50 became more negative, and Kleaf–max decreased in resprouts with the increasing age; thus, leaf hydraulic efficiency clearly traded off against safety. The difference between ψmid and Kleaf P50, leaf hydraulic safety margin, increased gradually with increasing resprout age. More negative ψmid and Kleaf P50 were closely related to decreasing LSC and more negative πtlp, respectively, and the decreasing Kleaf-max arose from the lower minor vein density and the narrower midrib xylem vessels. Our results showed that a clear trade-off between leaf hydraulic efficiency and safety helps C. korshinskii resprouts adapt to increasing water stress as they approach final size.

Original languageEnglish
Pages (from-to)3347-3357
Number of pages11
JournalPlant Cell and Environment
Volume44
Issue number10
DOIs
Publication statusPublished - Oct 2021

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