Ulvans induce resistance against plant pathogenic fungi independently of their sulfation degree

Freitas, Mateus B. de; Ferreira, Luciana G.; Hawerroth, Caroline; Duarte, Maria Eugênia R.; Noseda, Miguel D.; Stadnik, Marciel J.

doi:10.1016/j.carbpol.2015.07.055

Cited by 38 publications

(13 citation statements)

References 36 publications

(48 reference statements)

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“…Therefore, we can conclude that three positions C-2 of rhamnose and C-2, C-3 of glucuronic acid were partly sulfated. This result was in agreement with IR spectral analysis above and published work [12].…”

Section: Resultssupporting

confidence: 83%

Effect of Sulfation on the Structure and Anticoagulant Activity of Ulvan Extracted From Green Seaweed Ulva Reticulata

Thu

2018

JST

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Ulvans are sulfated polysaccharides derived from the cell wall of green seaweeds. The chemical structure of ulvan extracted from Ulva reticulata is reported, focusing on investigation of the sulfated modification of the ulvan and the changes in structure and anticoagulant activity. The results showed that sulfated modification was able to change the ulvan conformational structure and markedly enhance its anticoagulant activity.

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Section: Resultssupporting

confidence: 83%

Effect of Sulfation on the Structure and Anticoagulant Activity of Ulvan Extracted From Green Seaweed Ulva Reticulata

Thu

2018

JST

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“…Petri dishes were then flooded with 2 mL sterile distilled water and conidia were dislodged using a bent glass rod. This suspension was then filtered twice through sterile gauze to eliminate mycelia and then adjusted to 10 6 conidia per mL using a haemocytometer (de Freitas et al ., ).…”

Section: Methodsmentioning

confidence: 97%

Most Colletotrichum species associated with tree tomato (Solanum betaceum) and mango (Mangifera indica) crops are not host‐specific

Cabrera

Rojas

et al. 2018

Plant Pathology

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An important constraint for crop production in Colombia is the high incidence of anthracnose caused by Colletotrichum species. Although several studies have focused on these fungi, the relationship between the different fungal species within the genus and their hosts and whether they display any host preference or host specificity has yet to be examined. In Colombia, diseases caused by Colletotrichum species are particularly severe in mango (Mangifera indica) and tree tomato (Solanum betaceum) crops. In a previous investigation, the Colletotrichum phylogenetic species attacking these crops were identified. The present study aimed to determine whether isolates collected from tree tomato and mango showed host preference or host specificity by assessing aggressiveness, spore density, latent period, and fitness of each strain on the two hosts. In the departments of Cundinamarca and Tolima, Colombia, isolates were collected from plants that presented typical anthracnose symptoms and were identified as C. acutatum, C. asianum, C. boninense, C. gloeosporioides, C. tamarilloi and C. theobromicola. Inoculation of conidia of each isolate onto both hosts showed isolates had no host preference and only the C. gloeosporioides isolate showed host specificity. However, in general, isolates produced a higher spore density when inoculated on the alternate host, which may indicate a difference in the degree of adaptation to each host. Statistical analyses of the assessed parameter values revealed that isolates use different infection strategies when infecting each host. In light of these results, the implications of using quantitative estimations of fitness when studying fungal pathogens are discussed.

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“…Recently, oligo/polysaccharides, derived from green, red, and brown macroalgae have gained much attention among researchers due to their elicitor activities leading to stimulate plant defense mechanisms and protect against a wide range of phytopathogens [ 5 ]. Ulvan from green seaweed, laminarin isolated from brown algae as well as carrageenan from red ones, and their oligomers derivatives, are extensively studied due to their capacity to enhance various plants defenses [ 5 , 6 , 7 , 8 , 9 , 10 ]. In the case of alginate purified from brown seaweed and oligoalginates, only few studies have been conducted.…”

Section: Introductionmentioning

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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Ulvans induce resistance against plant pathogenic fungi independently of their sulfation degree

Cited by 38 publications

References 36 publications

Effect of Sulfation on the Structure and Anticoagulant Activity of Ulvan Extracted From Green Seaweed Ulva Reticulata

Effect of Sulfation on the Structure and Anticoagulant Activity of Ulvan Extracted From Green Seaweed Ulva Reticulata

Most Colletotrichum species associated with tree tomato (Solanum betaceum) and mango (Mangifera indica) crops are not host‐specific

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

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