Induction of defence mechanisms in grapevine leaves by emodin- and anthraquinone-rich plant extracts and their conferred resistance to downy mildew

Godard, S.; Slacanin, Ivan; Viret, Olivier; Gindro, Katia

doi:10.1016/j.plaphy.2009.04.003

Cited by 56 publications

(37 citation statements)

References 44 publications

(62 reference statements)

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“…The difference in antifungal activity between the aqueous extract and the essential oil of the same species may be explained in terms of differential composition (Da Silva, 2006). The main classes of compounds present in essential oils are phenols, terpenes and aldehydes (Ceylan & Fung, 2004), while aqueous extracts contain mostly glucans, pectins and tannins (Godard et al, 2009). Chromatographic analyses of the essential oils from H. marrubioides, A. gratissima and C. verbenacea employed in the present study revealed the presence of six main chemical classes, namely, alcohols, aldehydes, esters, ethers, hydrocarbons and ketones.…”

Section: Discussionmentioning

confidence: 53%

Effectiveness of essential oils in the treatment of Colletotrichum truncatum-infected soybean seeds

Silva¹,

Souza²,

Machado³

et al. 2012

Trop. plant pathol.

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The aim of the study was to evaluate the antifungal activity of essential oils from "hortelã do campo" (Hyptis marrubioides), "alfazema-do-Brasil" (Aloysia gratissima) and "erva-baleeira" (Cordia verbenacea) and their efficacy in the treatment of soybean seeds infected with Colletotrichum truncatum. In vitro assays were performed to evaluate the effects of the oils on spore germination, mycelial growth, and the production and viability of C. truncatum conidia. Soybean seeds inoculated with C. truncatum were treated with essential oils at concentrations ranging from 0.5 to 2% and grown under greenhouse conditions. Seed health and germination percentages were evaluated according to standard protocols. Seedling emergence, stand establishment and the percentages of dead seedlings were determined, together with the emergence speed index, plantlet height and dry weight of aerial biomass. The oils from H. marrubioides, C. verbenacea and A. gratissima inhibited the germination and production of conidia as well as the growth of C. truncatum. At concentrations ≥ 1%, the effectiveness of the oils against soybean anthracnose was superior to, or at least comparable with, that of the fungicide carbendazim. The viability of conidia and the germination of soybean seeds were not affected by any of the treatments with essential oils. It is concluded that essential oils from H. marrubioides, A. gratissima and C. verbenacea have potential as alternatives to synthetic fungicides in the control of anthracnose in soybean seeds.

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Section: Discussionmentioning

confidence: 53%

Effectiveness of essential oils in the treatment of Colletotrichum truncatum-infected soybean seeds

Silva¹,

Souza²,

Machado³

et al. 2012

Trop. plant pathol.

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“…Peroxidases are also involved in numerous cellular processes including the final suberin and lignin biosynthesis steps [36] and the metabolism of phenylpropanoids [37]. In addition, peroxidases are involved in the oxidation of phenols and compounds toxic to pathogenic organisms [38] and the formation of papillae that can block fungal entry [39].…”

Section: Discussionmentioning

confidence: 99%

Pre-Infection Stages of Austropuccinia psidii in the Epidermis of Eucalyptus Hybrid Leaves with Different Resistance Levels

Silva

Rodella

et al. 2017

Forests

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Rust is a major Eucalyptus spp. disease, which is especially damaging for early-stage plants. The aim of this study was to verify the pre-infection process of Austropuccinia psidii (A. psidii) in the leaves of three phenological stages of Eucalyptus clones with different resistance levels. Plants from the hybrids of Eucalyptus urophylla × Eucalyptus grandis (E. grandis) with variable levels of resistance to this disease were used. The pathogen was inoculated in vitro on abaxial leaf discs of first, third, and fifth leaf stages and maintained under conditions suitable for disease development. Subsequently, samples from these discs were collected 24 and 120 h after inoculation and processed using scanning electron microscopy analysis. No symptoms were seen in any leaf stage of the resistant clone. Additionally, a low incidence of A. psidii germination (1.3-2%) and appressoria (0-0.5%) in three leaf stages was observed. However, the first leaf stage of the susceptible clone presented germination of large numbers of urediniospores (65%) with appressoria (55%) and degradation of the cuticle and wax. From the third stage, the percentage of germinated urediniospores (<15%) and appressoria (<2%) formation of this clone decreased. Protrusions on the leaf surface, associated with the pathogen, were observed on the first and third leaf stages of the resistant clone and on the fifth stage of the susceptible clone, suggesting a possible defensive plant reaction.

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“…19 The classical inducers of ISR include both biotic and abiotic factors, including disease causing microorganisms themselves, 24,25 plant growth promoting rhizobacteria, 22,26 chemicals 27,28 and natural plant products. 7,10,12,13,29,30 Plant products have been considered as one of the major groups of compounds that induce ISR. To date, extracts of at least a few plant species have been reported to contain allelopathic substances which can act as elicitors and induce systemic resistance in host plants resulting in reduction or inhibition of disease development.…”

mentioning

confidence: 99%

“…To date, extracts of at least a few plant species have been reported to contain allelopathic substances which can act as elicitors and induce systemic resistance in host plants resulting in reduction or inhibition of disease development. 7,10,12,13 In the present study, with the objective of understanding the mechanisms of disease suppression by leaf extracts of Z. jujuba and I. carnea, we investigated their ability to induce ISR in rice by analyzing the activities of ISR markers including PR-proteins and other defense enzymes involved in phenylpropanoid metabolism. The changes in activities of chitinase, β-1,3-glucanase, peroxidase, phenylalanine ammonia-lyase (PAL) and phenolic compounds induced in rice seedlings that were elicited with Figure 1.…”

mentioning

confidence: 99%

Induction of systemic resistance in rice by leaf extracts ofZizyphus jujubaandIpomoea carneaagainstRhizoctonia solani

Kagale

Marimuthu

Kagale

et al. 2011

Plant Signaling & Behavior

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Induction of defence mechanisms in grapevine leaves by emodin- and anthraquinone-rich plant extracts and their conferred resistance to downy mildew

Cited by 56 publications

References 44 publications

Effectiveness of essential oils in the treatment of Colletotrichum truncatum-infected soybean seeds

Effectiveness of essential oils in the treatment of Colletotrichum truncatum-infected soybean seeds

Pre-Infection Stages of Austropuccinia psidii in the Epidermis of Eucalyptus Hybrid Leaves with Different Resistance Levels

Induction of systemic resistance in rice by leaf extracts ofZizyphus jujubaandIpomoea carneaagainstRhizoctonia solani

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