Fosfito de potássio e ulvana no controle da mancha foliar da gala em macieira

Araújo, Leonardo; Stadnik, Marciel J.; Borsato, Leandro Camargo; Valdebenito‐Sanhueza, Rosa Maria

doi:10.1590/s1982-56762008000200009

Cited by 32 publications

(28 citation statements)

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“…Silicon can therefore interact with several key components of the plant stress response-related signaling pathways, leading to effective resistance to pathogenic fungi. In agreement with the results of our study, Araújo et al (2008), while studying Colletotrichum gloeosporioides, showed that potassium phosphite (Fitofós K®) has a direct effect on this fungus, almost completely inhibiting the mycelial growth in vitro. Potassium phosphite was tested against Penicillium expansum, which causes postharvest blue mold infections on apple fruits; this compound completely inhibited the mycelial growth (Amiri and Bompeix, 2011).…”

Section: Discussionsupporting

confidence: 92%

Evaluation of in vitro inhibition of mycelial growth of Fusarium solani f. sp. piperis by different products in Brazil

Dâ€TMAddazio¹,

Santos²,

Leitao³

et al. 2016

Afr. J. Microbiol. Res.

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The black pepper (Piper nigrum L.) is one of the most popular peppers in the world. Nonetheless, there are several limitations on cultivation, resulting in reduced production or a complete loss of the crop. The major disease affecting this crop is fusarium root rot caused by Fusarium solani f. sp. piperis, which is responsible for decimating whole crops in Brazil, with losses reaching millions of dollars per year. So far, there is no effective control measure against this fungus and no cultivars resistant to it. In this study, in vitro effects of different products on colony growth was evaluated. Carbendazim, chitosan, silicon, and phosphate were tested against F.solani f. sp. piperis isolates CML-2466, CML-2353, E-637, and E-596. Chitosan and silicon did not inhibit mycelial growth of any of the isolates, while phosphite inhibited mycelial growth by 100%. Carbendazim was found to be fungitoxic for isolates CML-2353 and E-596 and fungistatic for CML-2466 and E-637, inhibiting the mycelial growth of these isolates by 60 and 80%, respectively. There were no dose effects of the products tested.

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Section: Discussionsupporting

confidence: 92%

Evaluation of in vitro inhibition of mycelial growth of Fusarium solani f. sp. piperis by different products in Brazil

Dâ€TMAddazio¹,

Santos²,

Leitao³

et al. 2016

Afr. J. Microbiol. Res.

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“…and can reduce the severity of a broad range of diseases on beans, such as rust (Uromyces appendiculatus (Persoon) Link) (Borsato et al, 2010;Delgado et al, 2013), anthracnose (C. lindemuthianum) (Paulert et al, 2009;Freitas & Stadnik, 2012) and powdery mildew (E. poligoni) (Jaulneau et al, 2011). In addition, the polissaccharide has shown promising results against other diseases such as Glomerella leaf spot (C. gloeosporioides (Penzig) Penzig and Saccardo) on apple (Araújo et al, 2008;Araújo & Stadnik, 2013) and powdery mildew (Blumeria graminis (DeCandole) Speer) on wheat and barley (Paulert et al, 2010;Jaulneau et al, 2011). The effects of ulvan in different pathosystems are shown on Table 1.…”

Section: Ulvansmentioning

confidence: 99%

Algal polysaccharides as source of plant resistance inducers

Stadnik¹,

Freitas²

2014

Trop. plant pathol.

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126

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Algal compounds exhibit great potential to enhance plant growth and resistance to abiotic and biotic stresses. This review focuses on aspects concerning the physical-chemical properties, function and biological activity of macroalgae polysaccharides. Updated results of the main poly-and oligosaccharides studied for the control of plant diseases are discussed and summarized. The carrageenans from red algae have a well-established obtaining system, but its high market value discourages its use in plant protection. The fucans found in the cell walls of brown algae are present in several fertilizers and accounted for the benefits of such commercial products on plant physiology. The laminarans, from brown algae mainly Laminaria digitata, are currently the main algal polysaccharides on the phytosanitary market. The ulvans, from cell the walls of Ulva spp., open new ways to obtain polysaccharides able to induce resistance due to its abundance worldwide. All these algal polysaccharides show ability to activate multiple plant defense mechanisms against a broad spectrum of plant pathogens. Taking into account the promising results reported in the literature and the enormous biochemical diversity of these biopolymers, it is likely that they will provide new types of resistance inducers in a near future.

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“…Devido à influência da idade na suscetibilidade a MFG, as folhas superiores foram escolhidas, pois estas são mais suscetíveis do que as inferiores, mais velhas (Araújo et al, 2008). Os discos foliares coletados para análise microscópica foram processados conforme metodologia descrita por Araújo e Stadnik (2011).…”

Section: A Mancha Foliar De Glomerella (Mfg) Causada Porunclassified

Múltiplos apressórios e tubos de anastomoses conidiais no processo infeccioso de Colletotrichum gloeosporioides em macieira

Araújo

Stadnik

2013

Bragantia

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A Mancha Foliar de Glomerella (MFG), causada por Colletotrichum gloeosporioides, é uma doença emergente e destrutiva, da qual pouco se conhece sobre as relações patógeno/hospedeiro. O objetivo deste trabalho foi quantificar o número de apressórios por conídio e verificar a presença de Tubos de Anastomoses Conidiais (TAC) formados sobre folhas de macieira resistente e suscetível para MFG, inoculadas com dois isolados de C. gloeosporioides (MANE55 e MANE147). Os eventos iniciais de penetração de C. gloeosporioides foram semelhantes em ambos os genótipos, porém, o isolado MANE55 apresentou maior número de conídios germinados com múltiplos apressórios. Foi observado TAC sobre lesões da MFG para ambos os isolados em todos os intervalos de tempo.Palavras-chave: mancha foliar de Glomerela, Malus domestica, resistência. Multiple appressoria and conidial anastomosis tubes in the infection process of Colletotrichum gloeosporioides on apple AbstractThe Glomerella Leaf Spot (GLS), caused by Colletotrichum gloeosporioides is an emerging and destructive plant disease, of which little is known about the relationship pathogen/host. The objective of this study was to quantify the number of appressoria per conidium and verify the presence of Conidial Anastomosis Tubes (CAT) formed on apple resistant and susceptible leaves to GLS, inoculated with two isolates of C. gloeosporioides (MANE55 and MANE147). The early penetration events of C. gloeosporioides were similar in both genotypes, but the isolated MANE55 showed a greater number of germinated conidia with multiple appressoria. CAT on lesions of GLS were observed for both the isolates at all time intervals.

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Fosfito de potássio e ulvana no controle da mancha foliar da gala em macieira

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Cited by 32 publications

References 0 publications

Evaluation of in vitro inhibition of mycelial growth of Fusarium solani f. sp. piperis by different products in Brazil

Evaluation of in vitro inhibition of mycelial growth of Fusarium solani f. sp. piperis by different products in Brazil

Algal polysaccharides as source of plant resistance inducers

Múltiplos apressórios e tubos de anastomoses conidiais no processo infeccioso de Colletotrichum gloeosporioides em macieira

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