Ascophyllum extract application causes reduction of disease levels in field tomatoes grown in a tropical environment

Ali, Nerissa; Ramkissoon, Antonio; Ramsubhag, Adesh; Jayaraj, J.

doi:10.1016/j.cropro.2016.01.016

Cited by 40 publications

(45 citation statements)

References 32 publications

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“…On a worldwide scale, tomato constitutes an essential vegetable fresh crop. In spite of its economic importance, bacterial and fungal diseases and pests became the major common constraints accounting for poor tomato production [ 42 ]. Bacterial disease caused by Xanthomonas campestris pv.…”

Section: Resultsmentioning

confidence: 99%

Induction of Natural Defenses in Tomato Seedlings by Using Alginate and Oligoalginates Derivatives Extracted from Moroccan Brown Algae

et al. 2020

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Polysaccharides extracted from marine algae have attracted much attention due to their biotechnological applications, including therapeutics, cosmetics, and mainly in agriculture and horticulture as biostimulants, biofertilizers, and stimulators of the natural defenses of plants. This study aimed to evaluate the ability of alginate isolated from Bifurcaria bifurcata from the Moroccan coast and oligoalginates derivatives to stimulate the natural defenses of tomato seedlings. Elicitation was carried out by the internodal injection of bioelicitor solutions. The elicitor capacities were evaluated by monitoring the activity of phenylalanine ammonia-lyase (PAL) as well as polyphenols content in the leaves located above the elicitation site for 5 days. Alginate and oligoalginates treatments triggered plant defense responses, which showed their capacity to significantly induce the PAL activity and phenolic compounds accumulation in the leaves of tomato seedlings. Elicitation by alginates and oligoalginates showed an intensive induction of PAL activity, increasing from 12 h of treatment and remaining at high levels throughout the period of treatment. The amount of polyphenols in the leaves was increased rapidly and strongly from 12 h of elicitation by both saccharide solutions, representing peaks value after 24 h of application. Oligoalginates exhibited an effective elicitor capacity in polyphenols accumulation compared to alginate polymers. The alginate and oligosaccharides derivatives revealed a similar elicitor capacity in PAL activity whereas the accumulation of phenolic compounds showed a differential effect. Polysaccharides extracted from the brown seaweed Bifurcaria bifurcate and oligosaccharides derivatives induced significantly the phenylpropanoid metabolism in tomato seedlings. These results contribute to the valorization of marine biomass as a potential bioresource for plant protection against phytopathogens in the context of eco-sustainable green technology.

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Section: Resultsmentioning

confidence: 99%

Induction of Natural Defenses in Tomato Seedlings by Using Alginate and Oligoalginates Derivatives Extracted from Moroccan Brown Algae

et al. 2020

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“…Early blight caused by the fungal pathogen Alternaria solani and bacterial spot/blight caused by Xanthomonas campestris pv. vesicatoria are the two most economically important tomato diseases worldwide including the Caribbean (Ali et al , ). Both agents are responsible for major crop damages each year and account for yield losses of 35–78% per year (Chaerani & Voorrips, ).…”

Section: Introductionmentioning

confidence: 99%

Bio-efficacy of a chitosan based elicitor onAlternaria solaniandXanthomonas vesicatoriainfections in tomato under tropical conditions

et al. 2016

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With increasing problems of decreased efficacy, toxicity and environmental degradation due to the use of chemical fungicides, there is urgent need for developing alternative strategies for managing crop diseases. One approach currently being explored is the application of safe organic-based compounds to prime the defence systems of plants in order to prevent or limit infections by pathogens. Chitosan, a deacylated derivative of chitin, is one of the compounds known to promote plant defence and growth, but the mechanisms by which it is able to do so are still unclear. This study investigated the ability of a commercial chitosan extract (Armour-Zen ® ) to reduce disease incidence and induce the production of enzymes and expression of marker genes involved in plant defences for two important tomato pathogens, Alternaria solani and Xanthomonas vesicatoria. Foliar spray applications of the chitosan extract significantly reduced the incidences of both diseases in greenhouse and field grown tomato plants and also displayed a positive effect on growth and yields of tomato fruits. Chitosan-treated plants recorded elevated levels of defence enzymes and upregulation of the PIN II marker gene for defence signalling pathways when compared to the control. It was therefore proposed that chitosan would able to provide broad-range protection through induced systemic resistance mechanisms.

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“…Several reports show that ANE acts as a potential elicitor and possesses disease suppressive activities (Jayaraman et al, 2011; Khan et al, 2009). The ANE has been known to suppress diseases in several plants such as Arabidopsis, carrot, cucumber and tomato (Abkhoo and Sabbagh, 2016; Ali et al, 2016; Jayaraj et al, 2008; Jayaraman et al, 2011; Subramanian et al, 2011). Previously published reports suggest that ANE induces plant defense systems against broad ranges of pathogens (Khan et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…The induction of defense-related enzymes including PAL, PO, and PPO was observed 72 h post-inoculation, and further increased up to 120 h in ANE treated plants. Several studies showed that the elicitation of resistance against fungal pathogens by seaweed extract was mediated by an increase in PAL, PO, and PPO activity (apple, cucumber, carrot, and tomato) (Ali et al, 2016; Hernández-Herrera et al, 2014; Jayaraj et al, 2008; Jayaraman et al, 2011). In these studies, the increased plant’s resistance to different pathogens was marked by the enhanced activity and expression of different defense-related genes involved in the accumulation of secondary metabolites.…”

Section: Discussionmentioning

confidence: 99%

A Biostimulant Preparation of Brown Seaweed Ascophyllum nodosum Suppresses Powdery Mildew of Strawberry

et al. 2019

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Ascophyllum extract application causes reduction of disease levels in field tomatoes grown in a tropical environment

Cited by 40 publications

References 32 publications

Induction of Natural Defenses in Tomato Seedlings by Using Alginate and Oligoalginates Derivatives Extracted from Moroccan Brown Algae

Induction of Natural Defenses in Tomato Seedlings by Using Alginate and Oligoalginates Derivatives Extracted from Moroccan Brown Algae

Bio-efficacy of a chitosan based elicitor onAlternaria solaniandXanthomonas vesicatoriainfections in tomato under tropical conditions

A Biostimulant Preparation of Brown Seaweed Ascophyllum nodosum Suppresses Powdery Mildew of Strawberry

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