Coordinated plasticity maintains hydraulic safety in sunflower leaves

Plant, Cell & Environment
Amanda A CardosoScott A M McAdam

Abstract

The xylem cavitation threshold water potential establishes a hydraulic limit on the ability of woody species to survive in water-limiting environments, but herbs may be more plastic in terms of their ability to adapt to drying conditions. Here, we examined the capacity of sunflower (Helianthus annuus L.) leaves to adapt to reduced water availability by modifying the sensitivity of xylem and stomata to soil water deficit. We found that sunflower plants grown under water-limited conditions significantly adjusted leaf osmotic potential, which was linked to a prolongation of stomatal opening as soil dried and a reduced sensitivity of photosynthesis to water-stress-induced damage. At the same time, the vulnerability of midrib xylem to water-stress-induced cavitation was observed to be highly responsive to growth conditions, with water-limited plants producing conduits with thicker cell walls which were more resistant to xylem cavitation. Coordinated plasticity in osmotic potential and xylem vulnerability enabled water-limited sunflowers to safely extract water from the soil, while protecting leaf xylem against embolism. High plasticity in sunflower xylem contrasts with data from woody plants and may suggest an alternative strategy i...Continue Reading

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Citations

Jul 8, 2018·Plant, Cell & Environment·Kate M JohnsonTimothy J Brodribb
May 29, 2019·Tree Physiology·Pierre-André WaiteChristoph Leuschner
Jul 6, 2019·Plant, Cell & Environment·Katherine A McCullohFrederick C Meinzer
Aug 1, 2019·The New Phytologist·Annika E HuberTaryn L Bauerle
Nov 5, 2019·The Plant Journal : for Cell and Molecular Biology·Dongliang Xiong, Miquel Nadal
Jan 19, 2020·Plant, Cell & Environment·Déborah CorsoTimothy Brodribb
Jan 24, 2020·Journal of Experimental Botany·Freya RichardsonTimothy J Brodribb
Aug 29, 2018·International Journal of Molecular Sciences·Jared J StewartBarbara Demmig-Adams
Mar 15, 2020·Nature Plants·T J BrodribbN M Holbrook
Jul 20, 2019·The Biochemical Journal·Barbara Demmig-AdamsWilliam W Adams
Feb 24, 2021·American Journal of Botany·Karolina HeydukMichael R McKain
Jun 14, 2021·Plant Physiology and Biochemistry : PPB·Elisa AbatePatrizia Trifilò

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