Treating seeds with activators of plant defence generates long‐lasting priming of resistance to pests and pathogens

Worrall, Dawn; Holroyd, Geoff H.; Moore, Jason P.; Glowacz, Marcin; Croft, Patricia; Taylor, Jane; Paul, Nigel D.; Roberts, Michael R.

doi:10.1111/j.1469-8137.2011.03987.x

Cited by 169 publications

(155 citation statements)

References 59 publications

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“…1A). Similarly, the application of 10 mM BABA induced significant resistance against O. neolycopersici in S. lycopersicum 'Amateur' in agreement with previous studies (Worrall et al, 2012;Bengtsson et al, 2014a). However, in contrast to oligandrin, BABA application induced significant changes only in the length of the conidia and not their representation (Fig.…”

Section: Comparison Of Levels Of Induced Resistance By Baba and Oligasupporting

confidence: 78%

“…The observed resistance in BABA-treated S. lycopersicum plants against O. neolycopersici infection has previously been demonstrated for BABAtreated tomato seeds (Worrall et al, 2012). However, our data from BABA-treated leaves show a direct activation of the defence responses, characterized by an enhanced accumulation of pathogenesis-related genes, rather than the priming effect, as observed in the study on tomato seeds.…”

Section: Discussioncontrasting

confidence: 55%

“…This result, together with an increased ET production and a clear upregulation of key enzymes (ACS2 and ACO4-like) of the ET synthesis pathway, supports suggested ET-dependent mechanisms in BABA-induced resistance in tomato. The participation of ET signalling in BABAprimed resistance in tomato is further promoted by the observation that BABA as well as ET increased disease severity caused by the necrotrophs (van Loon et al, 2006;Worrall et al, 2012). Moreover, we found an interesting overlap of transcripts upregulated by BABA and O. neolycopersici with those detected in Phytophthora capsici-tomato interaction and suggesting involvement of ET in the disease development during early and biotrophic infection stages (Jupe et al, 2013).…”

Section: Discussionmentioning

confidence: 52%

See 2 more Smart Citations

Diverse responses of wild and cultivated tomato to BABA, oligandrin andOidium neolycopersiciinfection

Satková

Starý

Plešková

et al. 2016

Ann Bot

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Background and Aims Current strategies for increased crop protection of susceptible tomato plants against pathogen infections include treatment with synthetic chemicals, application of natural pathogen-derived compounds or transfer of resistance genes from wild tomato species within breeding programmes. In this study, a series of 45 genes potentially involved in defence mechanisms was retrieved from the genome sequence of inbred reference tomato cultivar Solanum lycopersicum 'Heinz 1706'. The aim of the study was to analyse expression of these selected genes in wild and cultivated tomato plants contrasting in resistance to the biotrophic pathogen Oidium neolycopersici, the causative agent of powdery mildew. Plants were treated either solely with potential resistance inducers or by inducers together with the pathogen.Methods The resistance against O. neolycopersici infection as well as RT-PCR-based analysis of gene expression in response to the oomycete elicitor oligandrin and chemical agent b-aminobutyric acid (BABA) were investigated in the highly susceptible domesticated inbred genotype Solanum lycopersicum 'Amateur' and resistant wild genotype Solanum habrochaites.Key Results Differences in basal expression levels of defensins, germins, b-1,3-glucanases, heveins, chitinases, osmotins and PR1 proteins in non-infected and non-elicited plants were observed between the highly resistant and susceptible genotypes. Moreover, these defence genes showed an extensive up-regulation following O. neolycopersici infection in both genotypes. Application of BABA and elicitin induced expression of multiple defence-related transcripts and, through different mechanisms, enhanced resistance against powdery mildew in the susceptible tomato genotype.Conclusions The results indicate that non-specific resistance in the resistant genotype S. habrochaites resulted from high basal levels of transcripts with proven roles in defence processes. In the susceptible genotype S. lycopersicum 'Amateur', oligandrin-and BABA-induced resistance involved different signalling pathways, with BABAtreated leaves displaying direct activation of the ethylene-dependent signalling pathway, in contrast to previously reported jasmonic acid-mediated signalling for elicitins.

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Section: Comparison Of Levels Of Induced Resistance By Baba and Oligasupporting

confidence: 78%

Section: Discussioncontrasting

confidence: 55%

Section: Discussionmentioning

confidence: 52%

See 1 more Smart Citation

Diverse responses of wild and cultivated tomato to BABA, oligandrin andOidium neolycopersiciinfection

Satková

Starý

Plešková

et al. 2016

Ann Bot

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“…able to rapidly activate their defence mechanisms when challenged by pathogens. This primed state of the plant is a relatively longlasting phenomenon, as reported by Worrall et al [88], who observed increased resistance to B. cinerea for up to 8 weeks after the treatment in tomato plants grown from JA treated seeds.…”

Section: Mechanisms Of Improving Host Resistance Against Pathogensmentioning

confidence: 53%

Using jasmonates and salicylates to reduce losses within the fruit supply chain

Glowacz

Rees

2015

Eur Food Res Technol

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The fresh produce industry is constantly growing, due to increasing consumer demand. The shelf-life of some fruit, however, is relatively short, limited by microbial contamination or visual, textural and nutritional quality loss. Thus, techniques for reducing undesired microbial contamination, spoilage and decay, as well as maintaining product's visual, textural and nutritional quality are in high demand at all steps within the supply chain. The postharvest use of signalling molecules, i.e. jasmonates and salicylates seems to have unexplored potential. The focus of this review is on the effects of treatment with jasmonates and salicylates on the fresh produce quality, defined by decay incidence and severity, chilling injury, maintenance of texture, visual quality, taste and aroma, and nutritional content. Postharvest treatments with jasmonates and salicylates have the ability to reduce decay by increasing fruit resistance to diseases and reducing chilling injury in numerous products.These treatments also possess the ability to improve other quality characteristics, i.e. appearance, texture maintenance and nutritional content. Furthermore, they can easily be combined with other treatments, e.g. heat treatment, ultrasound treatment. A good understanding of all the benefits and limitations related to the postharvest use of jasmonates and salicylates is needed, and relevant information has been reviewed in this paper.

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“…Treating the seeds is the most convenient method of fungicide application as it provides protection of the plants at their most vulnerable stage of development (Worrall et al 2012). Many studies have shown that root drench treatment works better than foliar spray (Srivastava et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Systemic protection against pearl millet downy mildew disease induced by cell wall glucan elicitors from Trichoderma hamatum UOM 13

Lavanya¹,

Niranjan-Raj²,

Nayaka³

et al. 2017

Journal of Plant Protection Research

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The obligate oomycete Sclerospora graminicola (Sacc.) Schroet, is the incitant of downy mildew disease, which is the main constraint in pearl millet production worldwide. Different elicitors from Trichoderma hamatum UOM 13, e.g. mycelial extract and cell wall glucans, were assessed for their resistance elicitation efficiency and the possible underlying mechanisms. Both mycelial extract and cell wall glucans of T. hamatum UOM 13 positively influenced seed quality parameters of pearl millet, significantly enhanced seed germination and seedling vigor in comparison to the untreated control. Seed priming with cell wall glucan elicitors of T. hamatum UOM 13 suppressed downy mildew on susceptible pearl millet seedlings under greenhouse conditions by induction of systemic host resistance. Of the different elicitor delivery methods tested, transplant root dip was more effective than seed treatment and foliar spray. A combination of transplant root dip + seed treatment + foliar spray was significantly more effective than the single delivery methods. The induced resistance corresponded to up regulation of genes of important defense proteins upon pathogen inoculation. Transcripts of genes of defense enzymes glucanase, phenylalanine ammonia lyase, peroxidase and polyphenoloxidase were significantly increased due to the T. hamatum UOM elicitor effect. Expression of hydroxyproline-rich glycoprotein genes, known to play an important role in cell wall cross-linking, were also up regulated in response to T. hamatum UOM cell wall glucan treatment. This study emphasizes the role of T. hamatum UOM as a potential elicitor of downy mildew resistance in pearl millet and presents novel insights into the involvement of important defense proteins mediating such as resistance trigger.

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Treating seeds with activators of plant defence generates long‐lasting priming of resistance to pests and pathogens

Cited by 169 publications

References 59 publications

Diverse responses of wild and cultivated tomato to BABA, oligandrin andOidium neolycopersiciinfection

Diverse responses of wild and cultivated tomato to BABA, oligandrin andOidium neolycopersiciinfection

Using jasmonates and salicylates to reduce losses within the fruit supply chain

Systemic protection against pearl millet downy mildew disease induced by cell wall glucan elicitors from Trichoderma hamatum UOM 13

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