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The recurrent evolution of extremely resistant xylem

  • Scott A. M. McAdamEmail author
  • Amanda A. Cardoso
Commentary

Abstract

Key message

Highly resistant xylem has evolved multiple times over the past 400 million years.

Context

Water is transported under tension in xylem and consequently is vulnerable to invasion by air and the formation of embolism. A debate has raged over whether embolism formation is non-reversible occurring at low water potentials or a regular diurnal occurrence that is non-lethal because of a capacity to refill embolised conduits.

Aims

This commentary is on a recent article, which utilised new non-invasive imaging techniques for assessing the formation of embolism in xylem, finding that the xylem of Laurus nobilis was highly resistant to the formation of embolism.

Methods

The recent results of this discovery are placed in the context knowledge from a diversity of species that has so far been identified with xylem similarly highly resistant to embolism formation.

Results

The discovery that L. nobilis has xylem highly resistant to embolism formation adds to a body of literature suggesting that the resistance of xylem to embolism formation is a key adaptation utilised by many species native to seasonally dry environments. Highly resistant xylem has evolved numerous times across the angiosperm clade.

Conclusion

With more studies utilising similar observational and direct methods of assessing embolism resistance, further insight into the ecological and evolutionary relevance of this trait is imminent.

Keywords

Xylem Vulnerability Evolution Embolism Drought 

Notes

Funding

This work was supported by the USDA National Institute of Food and Agriculture, Hatch project 1014908.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

13595_2018_786_MOESM1_ESM.xlsx (22 kb)
ESM 1 (XLSX 22.4 kb)

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Copyright information

© INRA and Springer-Verlag France SAS, part of Springer Nature 2018 2018

Authors and Affiliations

  1. 1.Department of Botany and Plant Pathology, Purdue Center for Plant BiologyPurdue UniversityWest LafayetteUSA

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