&lt;b&gt;Essential oils from &lt;i&gt;Hyptis marrubioides&lt;/i&gt;, &lt;i&gt;Aloysia gratissima&lt;/i&gt; and &lt;i&gt;Cordia verbenacea&lt;/i&gt; reduce the progress of Asian soybean rust

Silva, André Costa da; Souza, Paulo Estevão de; Amaral, Douglas Carvalho; Zeviani, Walmes Marques; Pinto, José Eduardo Brasil Pereira

doi:10.4025/actasciagron.v36i2.17441

Cited by 18 publications

(9 citation statements)

References 32 publications

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“…While Silva et al. (,b, ) observed that the preparations derived from these plant species were very effective against Asian soybean rust and in the treatment of soybean seeds infected by Colletotrichum truncatum , no information is available concerning the effects of these products on Oidium and on the induction of resistance to fungal infection.…”

Section: Discussionmentioning

confidence: 99%

“…The essential oils of these three species of plants have also been shown to be effective in the control of phytopathogens (Silva et al. ,b, ). In the present study, we have investigated the local and systemic effects of the essential oils and decoctions derived from these plant species on the control of O. eucalypti in a highly susceptible hybrid Eucalyptus urophylla × Eucalyptus camaldulensis (‘urocam’).…”

Section: Introductionmentioning

confidence: 99%

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Local and systemic control of powdery mildew in eucalyptus using essential oils and decoctions from traditional Brazilian medicinal plants

et al. 2013

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Eucalyptus plants cultivated in greenhouses, nurseries and clonal minigardens are vulnerable to attack of Oidium eucalypti (powdery mildew). Essential oils and decoctions prepared from the traditional Brazilian medicinal plants Aloysia gratissima, Cordia verbenacea and Hyptis marrubioides have been shown to be effective in the control of some plant diseases. In this study, the local and systemic effects of these preparations in the control of O. eucalypti were evaluated by assessing the progress of the disease in saplings of a highly susceptible hybrid population of eucalyptus ('urocam'). The systemic effects were also assessed by investigating the ability of the preparations to induce disease resistance, as indicated by increased peroxidase activity. The natural products were found to be as effective as a commercial fungicide (mixture of pyraclostrobin and epoxiconazole) for the control of O. eucalypti in eucalyptus plants under greenhouse conditions. Additionally, the essential oil and decoction of A. gratissima were able to exert systemic control over O. eucalypti and induce peroxidase activity in Oidium-inoculated plants. Scanning electron microscopy revealed that the oils and decoctions from the three species exhibited direct fungitoxic activities on O. eucalypti as shown by lysis of hyphal walls and shrinking of conidia. The results presented herein suggest that oils and decoctions from A. gratissima, C. verbenacea and H. marrubioides may offer an effective, practical and ecofriendly strategy for the control of O. eucalypti in eucalyptus.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Local and systemic control of powdery mildew in eucalyptus using essential oils and decoctions from traditional Brazilian medicinal plants

et al. 2013

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“…Besides agronomic practices, foliar application of some natural compounds such as Farnesyl-acetate [131], Acibenzolar-S-methyl [132], essential oils from H. marrubioides, A. gratissima, and C. verbenacea [133], coffee oil [134]; seed treatment with shale water [135]; root drenching with saccharin [136] were also reported to be effective in the suppression of SBR severity, but their actual efficacy for effective SBR control is still awaiting assessment under field conditions.…”

Section: Crop Management Practicesmentioning

confidence: 99%

Prospects for Durable Resistance Against an Old Soybean Enemy: A Four-Decade Journey from Rpp1 (Resistance to Phakopsora pachyrhizi) to Rpp7

et al. 2019

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Soybean rust (SBR), caused by Phakopsora spp., is a major global concern for soybean producers. SBR causing fungi are polycyclic and obligate biotrophs, rendering the study of their biology particularly tedious. Over the past four decades, substantial progress has been made towards understanding the epidemiology of the disease, the identification of sources of resistance, and the mapping of soybean loci conferring resistance to P. pachyrhizi (Rpp genes), since this species is particularly well established and widespread in many soybean growing areas. Although host-plant resistance is generally considered as the most desirable solution from an environmental, economic, and social perspective, other disease control approaches such as agronomic practices and chemical application are also important, and influence rust epidemiology as well as the durability of host plant resistance. This review focusses primarily on genetic aspects of SBR management and summarizes the research in the following areas: SBR symptoms, aetiology, pathogenic variation and population structure of Phakopsora populations, expression of soybean resistance to Phakopsora infection, genetics and molecular diagnostics of host resistance to pathogen, and resistance gene deployment approaches. Finally, the role of multidisciplinary strategies is discussed for achieving higher durability of SBR resistance in soybean.

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“…Despite the reports of their effectiveness against several diseases, mechanisms of the action of essential oils remain elusive. Although a direct effect in pathogen is well documented (Pereira et al, 2012;Nguefack et al, 2013;Silva et al, 2014Silva et al, , 2017Mourão et al, 2017), an indirect effect, by inducing plant defenses, cannot be ruled out. Therefore, this work aimed to assess the effect of B. maydis and E. turcicum as well as the essential oil of M. citrifolia in the activity of defense enzymes in corn plants.…”

Section: Introductionmentioning

confidence: 98%

“…Essential oils of cinnamon, citronella, lemongrass, clove, tea tree, thyme, neem and eucalyptus were promising for the control of coffee rust since they inhibited germination of urediniospores of Hemileia vastatrix; transmission electron microscopy analysis showed that urediniospores exposed to oils of clove, citronella and thyme promoted cellular disorganization and cytoplasmic vacuolization (Pereira et al, 2012). Total inhibition of urediniospore germination of Phakopsora pachyrhizi was also found after treatment with essential oils of Hyptis marrubioides, Aloysia gratissima and Cordia verbenacea and their curative application reduced area under the Asian rust curves by 33-41% (Silva et al, 2014). In maize, essential oil of Cymbopogon citratus reduced the progress of the Curvularia leaf spot when applied preventively and it was also showed to inhibit 100% of conidia germination, but not mycelial growth of Curvularia lunata (Mourão et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Enzymatic Activity in Essential Oil-Treated and Pathogen-Inoculated Corn Plants

Veloso¹,

Ferreira²,

Debona³

et al. 2018

JAS

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Bipolaris maydis and Exserohilum turcicum are important fungal pathogens that cause leaf blight in corn whose control have been difficult. Essential oils are a promising and environmentally friendly alternative for disease management, but the mechanisms of action remain poorly studied. Here, we aimed to assess the effect of B. maydis and E. turcicum as well as the essential oil of Morinda citrifolia in the activity of plant defense enzymes in corn plants. Experiments were carried out in a completely randomized design with three replications and six treatments as they follow: (T1): corn plants inoculated with B. maydis; (T2): corn plants inoculated with E. turcicum; (T3): corn plants treated with essential oil of M. citrifolia (0.25%) and inoculated with B. maydis; (T4): corn plants treated with essential oil of M. citrifolia (0.25%) and inoculated with E. turcicum; (T5): corn plants treated with essential oil of M. citrifolia (0.25%); and (T6): corn plants non-inoculated and treated with distilled water. Protein content (PC) and activities of the enzymes ascorbate peroxidase, catalase, chitinase (CHI), peroxidase (POX) and superoxide dismutase (SOD) were assessed. PC was significantly decreased, whereas CHI and SOD activity was higher in T1-T5 compared to T6. T4 and T5 significantly increased POX activity relative to T6. Therefore, our findings suggest that the essential oil of M. citrifolia may play an active role in disease control by activating defense enzymes in corn plants.

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<b>Essential oils from <i>Hyptis marrubioides</i>, <i>Aloysia gratissima</i> and <i>Cordia verbenacea</i> reduce the progress of Asian soybean rust

Cited by 18 publications

References 32 publications

Local and systemic control of powdery mildew in eucalyptus using essential oils and decoctions from traditional Brazilian medicinal plants

Local and systemic control of powdery mildew in eucalyptus using essential oils and decoctions from traditional Brazilian medicinal plants

Prospects for Durable Resistance Against an Old Soybean Enemy: A Four-Decade Journey from Rpp1 (Resistance to Phakopsora pachyrhizi) to Rpp7

Enzymatic Activity in Essential Oil-Treated and Pathogen-Inoculated Corn Plants

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