Non-invasive imaging reveals convergence in root and stem vulnerability to cavitation across five tree species

Peters, Jen; Gauthey, Alice; Lopez, Rosana; Carins-Murphy, Madeline R.; Brodribb, Timothy J.; Choat, Brendan

doi:10.1093/jxb/eraa381

Non-invasive imaging reveals convergence in root and stem vulnerability to cavitation across five tree species

Journal Article · Fri Sep 18 00:00:00 EDT 2020 · Journal of Experimental Botany

DOI:https://doi.org/10.1093/jxb/eraa381· OSTI ID:1826012

Peters, Jen ^[1]; Gauthey, Alice ^[2]; Lopez, Rosana ^[3]; Carins-Murphy, Madeline R. ^[4]; Brodribb, Timothy J. ^[4]; ^[2]

Univ. of Western Sydney, NSW (Australia); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Western Sydney, NSW (Australia)
Univ. of Western Sydney, NSW (Australia); Ciudad Univ., Madrid (Spain)
Univ. of Tasmania, Hobart, TAS (Australia)

Root vulnerability to cavitation is challenging to measure and under-represented in current datasets. This gap limits the precision of models used to predict plant responses to drought because roots comprise the critical interface between plant and soil. In this study, we measured vulnerability to drought-induced cavitation in woody roots and stems of five tree species (Acacia aneura, Cedrus deodara, Eucalyptus crebra, Eucalytus saligna, and Quercus palustris) with a wide range of xylem anatomies. X-ray microtomography was used to visualize the accumulation of xylem embolism in stems and roots of intact plants that were naturally dehydrated to varying levels of water stress. Vulnerability to cavitation, defined as the water potential causing a 50% loss of hydraulic function (P₅₀), varied broadly among the species (–4.51 MPa to –11.93 MPa in stems and –3.13 MPa to –9.64 MPa in roots). The P₅₀ of roots and stems was significantly related across species, with species that had more vulnerable stems also having more vulnerable roots. While there was strong convergence in root and stem vulnerability to cavitation, the P₅₀ of roots was significantly higher than the P₅₀ of stems in three species. However, the difference in root and stem vulnerability for these species was small; between 1% and 31% of stem P₅₀. Thus, while some differences existed between organs, roots were not dramatically more vulnerable to embolism than stems, and the differences observed were less than those reported in previous studies. Further study is required to evaluate the vulnerability across root orders and to extend these conclusions to a greater number of species and xylem functional types.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Australian Research Council (ARC); USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1826012

Alternate ID(s):: OSTI ID: 1836422

Journal Information:: Journal of Experimental Botany, Journal Name: Journal of Experimental Botany Journal Issue: 20 Vol. 71; ISSN 0022-0957

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Non-invasive imaging reveals convergence in root and stem vulnerability to cavitation across five tree species

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