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Induction of Defense Responses and Protection of Almond Plants Against Xylella fastidiosa by Endotherapy with a Bifunctional Peptide

Authors: Luís Moll, Aina Baró, Laura Montesinos, Esther Badosa, Anna Bonaterra, and Emilio Montesinos
Date Published: 08/08/2023
Via: https://doi.org/10.1094/PHYTO-12-21-0525-R
Keywords: Antimicrobials

Abstract

Xylella fastidiosa is a plant pathogenic bacterium that has been introduced in the European Union (EU), causing significant yield losses in economically important Mediterranean crops. Almond leaf scorch (ALS) is currently one of the most relevant diseases observed in Spain, and no cure has been found to be effective for this disease. In previous reports, the peptide BP178 has shown a strong bactericidal activity in vitro against X. fastidiosa and to other plant pathogens, and to trigger defense responses in tomato plants. In the present work, BP178 was applied by endotherapy to almond plants of cultivar Avijor using preventive and curative strategies. The capacity of BP178 to reduce the population levels of X. fastidiosa and to decrease disease symptoms and its persistence over time were demonstrated under greenhouse conditions. The most effective treatment consisted of a combination of preventive and curative applications, and the peptide was detected in the stem up to 60 days posttreatment. Priming plants with BP178 induced defense responses mainly through the salicylic acid pathway, but also overexpressed some genes of the jasmonic acid and ethylene pathways. It is concluded that the bifunctional peptide is a promising candidate to be further developed to manage ALS caused by X. fastidiosa.

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

Authors: Nancy C. Walker, Siul A. Ruiz, Talita R. Ferreira, Helvecio D. Coletta-Filho, James Le Houx, Daniel McKay Fletcher, Steven M. White, Tiina Roose

Date: 27/11/23

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...

Bioecological traits of spittlebugs and their implications on the epidemiology and control of Xylella fastidiosa epidemic in Apulia

Authors: Nicola Bodino, Vincenzo Cavalieri, Crescenza Dongiovanni, Maria Saponari, Domenico Bosco

Date: 03/11/23

Spatial-temporal dynamics of spittlebug populations, together with transmission biology, are of major importance to outline the disease epidemiology of Xylella fastidiosa subsp. pauca in Apulian olive groves. The spread rate of X. fastidiosa is mainly influenced by...

Direct and indirect effects of two endophytic entomopathogenic fungi on survival and feeding behaviour of meadow spittlebug Philaenus spumarius

Authors: Meelad Yousef-Yousef, Marina Morente, Natalia González-Mas, Alberto Fereres, Enrique Quesada-Moraga, Aranzazu Moreno

Date: 01/11/23

Highlights: Direct exposure of Philaenus to Metarhizium brunneum reduces its survivorship. M. brunneum successfully colonises the host plant and reduces survival of Philaenus. Philaenus reaches the xylem faster on M. brunneum-colonised plants. Xylem sap ingestion by...