The Bacterial Canker of Kiwifruit Caused by<i>Pseudomonas syringae</i>pv.<i>actinidiae</i>

Scortichini, Marco; Spinelli, Francesco; Templeton, Matt D.

doi:10.1079/9781800620933.0018

Cited by 1 publication

(1 citation statement)

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“…is a valuable perennial crop threatened by the bacterial pathogen Pseudomonas syringae pv. actinidiae (Psa) (McCann et al, 2017; Scortichini et al, 2023). Psa biovar 3 (Psa3) spread throughout kiwifruit-growing regions worldwide during a pandemic in the late 2000s, causing significant economic losses.…”

Section: Introductionmentioning

confidence: 99%

Identification and characterization of innate immunity inActinidia melanandrain response toPseudomonas syringaepv.actinidiae

Hemara,

Chatterjee,

Yeh

et al. 2024

Preprint

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Pseudomonas syringaepv.actinidiaebiovar 3 (Psa3) has decimated kiwifruit orchards growing susceptible kiwifruitActinidia chinensisvarieties. Effector loss has occurred recently in Psa3 isolates from resistant kiwifruit germplasm, resulting in strains capable of partially overcoming resistance present in kiwiberry vines (A. arguta,A. polygama, andA. melanandra). Diploid male A. melanandra recognises several effectors, sharing recognition of at least one avirulence effector (HopAW1a) with previously studied tetraploid kiwiberry vines. Sequencing and assembly of the A. melanandra genome enabled the characterisation of the transcriptomic response of this non-host to wild-type and genetic mutants of Psa3.A. melanandraappears to mount a classic effector-triggered immunity (ETI) response to wildtype Psa3 V-13, as expected. Surprisingly, the type III secretion (T3S) system-lacking Psa3 V-13 ∆hrcC strain did not appear to trigger pattern-triggered immunity (PTI) despite lacking the ability to deliver immunity-suppressing effectors. Contrasting the A. melanandra responses to an effectorless Psa3 V-13 ∆33E strain and to Psa3 V-13 ∆hrcC suggested that PTI triggered by Psa3 V-13 was based on the recognition of the T3S itself. The characterisation of both ETI and PTI branches of innate immunity responses withinA. melanandrafurther enables breeding for durable resistance in future kiwifruit cultivars.

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Section: Introductionmentioning

confidence: 99%