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A high‐throughput analysis of high‐resolution X‐ray CT images of stems of olive and citrus plants resistant and susceptible to Xylella fastidiosa

DOI: 10.1111/ppa.13835 DOI Help

Authors: Nancy C. Walker (University of Southampton) , Siul A. Ruiz (University of Southampton) , Talita R. Ferreira (Brazilian Synchrotron Light Laboratory (LNLS)) , Helvecio D. Coletta‐filho (Instituto Agronômico de Campinas) , James Le Houx (Diamond Light Source) , Daniel Mckay Fletcher (Rural Economy Environment and Society Research Group, SRUC) , Steven M. White (UK Centre for Ecology & Hydrology) , Tiina Roose (University of Southampton)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Plant Pathology , VOL 11

State: Published (Approved)
Published: November 2023

Open Access Open Access

Abstract: The bacterial plant pathogen Xylella fastidiosa causes disease in several globally important crops. However, some cultivars harbour reduced bacterial loads and express few symptoms. Evidence considering plant species in isolation suggests xylem structure influences cultivar susceptibility to X. fastidiosa. We test this theory more broadly by analysing high-resolution synchrotron X-ray computed tomography of healthy and infected plant vasculature from two taxonomic groups containing susceptible and resistant varieties: two citrus cultivars (sweet orange cv. Pera, tangor cv. Murcott) and two olive cultivars (Koroneiki, Leccino). Results found the susceptible plants had more vessels than resistant ones, which could promote within-host pathogen spread. However, features associated with resistance were not shared by citrus and olive. While xylem vessels in resistant citrus stems had comparable diameters to those in susceptible plants, resistant olives had narrower vessels that could limit biofilm spread. And while differences among olive cultivars were not detected, results suggest greater vascular connectivity in resistant compared to susceptible citrus plants. We hypothesize that this provides alternate flow paths for sustaining hydraulic functionality under infection. In summary, this work elucidates different physiological resistance mechanisms between two taxonomic groups, while supporting the existence of an intertaxonomical metric that could speed up the identification of candidate-resistant plants.

Journal Keywords: citrus variegated chlorosis; olive quick decline syndrome; resistance; X-ray computed tomography; Xylella fastidiosa; xylem

Diamond Keywords: Bacteria

Subject Areas: Biology and Bio-materials

Facility: MOGNO at Brazilian Synchrotron Light Laboratory (LNLS)

Added On: 29/11/2023 08:57

Plant Pathology - 2023 - Walker - A high‐throughput analysis of high‐resolution X‐ray CT images of stems of olive and.pdf

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Plant science Pathogens Agriculture & Fisheries Life Sciences & Biotech

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