Reynoutria sachalinensis extract elicits SA-dependent defense responses in courgette genotypes against powdery mildew caused by Podosphaera xanthii

Theoni Margaritopoulou; Eleftheria Toufexi; Dimosthenis Kizis; George Balayiannis; Christos Anagnostopoulos; Andreas Theocharis; Leonidas Rempelos; Yerasimos Troyanos; Carlo Leifert; Emilia Markellou

doi:10.1038/s41598-020-60148-6

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Reynoutria sachalinensis extract elicits SA-dependent defense responses in courgette genotypes against powdery mildew caused by Podosphaera xanthii

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Reynoutria sachalinensis extract elicits SA-dependent defense responses in courgette genotypes against powdery mildew caused by Podosphaera xanthii

Theoni Margaritopoulou, Eleftheria Toufexi, Dimosthenis Kizis, George Balayiannis, Christos Anagnostopoulos, Andreas Theocharis, Leonidas Rempelos, Yerasimos Troyanos, Carlo Leifert and Emilia Markellou

Scientific Reports, Vol.10, 3354

25/02/2020

DOI: https://doi.org/10.1038/s41598-020-60148-6

PMCID: PMC7042220

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Abstract

Plant Extracts - chemistry

Plant Extracts - pharmacology

Salicylic Acid - metabolism

Cucurbita - microbiology

Genotype

Plant Diseases - microbiology

Fungicides, Industrial - pharmacology

Polygonum - chemistry

Hydrogen Peroxide - metabolism

Ascomycota - pathogenicity

Cucurbita - drug effects

Plant Diseases - genetics

Glucans - metabolism

Cucurbita - genetics

Cucurbita - growth & development

Powdery mildew (PM) caused by Podosphaera xanthii is one of the most important courgette diseases with high yield losses and is currently controlled by fungicides and sulphur applications in conventional and organic production. Plant derived elicitors/inducers of resistance are natural compounds that induce resistance to pathogen attack and promote a faster and/or more robust activation of plant defense responses. Giant knotweed (Reynoutria sachalinensis, RS) extract is a known elicitor of plant defenses but its mode of action remains elusive. The aim of this study was to investigate the mechanisms of foliar RS applications and how these affect PM severity and crop performance when used alone or in combination with genetic resistance. RS foliar treatments significantly reduced conidial germination and PM severity on both an intermediate resistance (IR) and a susceptible (S) genotype. RS application triggered plant defense responses, which induced the formation of callose papillae, hydrogen peroxide accumulation and the Salicylic acid (SA) - dependent pathway. Increased SA production was detected along with increased p-coumaric and caffeic acid concentrations. These findings clearly indicate that RS elicits plant defenses notably as a consequence of SA pathway induction.

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Title: Reynoutria sachalinensis extract elicits SA-dependent defense responses in courgette genotypes against powdery mildew caused by Podosphaera xanthii
Creators: Theoni Margaritopoulou (Author) - Benaki Phytopathological Institute, Department of Phytopathology, Laboratory of Mycology, 8, St. Delta str., 145 61, Kifissia, Athens, Greece
Eleftheria Toufexi (Author) - Newcastle University, Nafferton Ecological Farming Group, School of Agriculture Food and Rural Development, Newcastle upon Tyne, NE1 7RU, UK
Dimosthenis Kizis (Author) - Benaki Phytopathological Institute, Department of Phytopathology, Laboratory of Mycology, 8, St. Delta str., 145 61, Kifissia, Athens, Greece
George Balayiannis (Author) - Benaki Phytopathological Institute, Department of Pesticides Control & Phytopharmacy, Laboratory of Chemical Control of Pesticides, 8, St. Delta str., 145 61, Kifissia, Athens, Greece
Christos Anagnostopoulos (Author) - Benaki Phytopathological Institute, Department of Pesticides Control & Phytopharmacy, Laboratory of Pesticide Residues, 8, St. Delta str., 145 61, Kifissia, Athens, Greece
Andreas Theocharis (Author) - Benaki Phytopathological Institute, Department of Phytopathology, Laboratory of Mycology, 8, St. Delta str., 145 61, Kifissia, Athens, Greece
Leonidas Rempelos (Author) - Newcastle University, Nafferton Ecological Farming Group, School of Agriculture Food and Rural Development, Newcastle upon Tyne, NE1 7RU, UK
Yerasimos Troyanos (Author) - Benaki Phytopathological Institute, Department of Phytopathology, Laboratory of Non-Parasitic Diseases, 8, St. Delta str., 145 61, Kifissia, Athens, Greece
Carlo Leifert (Author) - Southern Cross University
Emilia Markellou (Author) - Benaki Phytopathological Institute, Department of Phytopathology, Laboratory of Mycology, 8, St. Delta str., 145 61, Kifissia, Athens, Greece. e.markellou@bpi.gr
Publication Details: Scientific Reports, Vol.10, 3354
Publisher: England
Identifiers: 991012925407902368
Academic Unit: Faculty of Science and Engineering; Centre for Organics Research
Language: English
Resource Type: Journal article

Reynoutria sachalinensis extract elicits SA-dependent defense responses in courgette genotypes against powdery mildew caused by Podosphaera xanthii

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