Suppression of Rice Blast by Preinoculation with Avirulent <i>Pyricularia oryzae</i> and the Nonrice Pathogen <i>Bipolaris sorokiniana</i>

Manandhar, Hira Kaji; Jørgensen, Hans Jørgen Lyngs; Mathur, S. B.; Smedegaard‐Petersen, V.

doi:10.1094/phyto.1998.88.7.735

Cited by 66 publications

(45 citation statements)

References 17 publications

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“…Hypovirulent fungal strains can also be used on the biocontrol of plant diseases, as reported by Manandhar et al (1998), when a hypovirulent Pyricularia oryzae isolate was able to reduce significantly neck blast caused by virulent strain under field conditions. Because of the pathological importance of M. perniciosa, the genetic (based on RAPD markers) and physiological (based on pathogenicity and extracellular enzymatic activity) analyses were used to distinguish isolates obtained from healthy and diseased cacao tissues.…”

Section: Introductionmentioning

confidence: 99%

Endophytic and pathogenic isolates of the cacao fungal pathogen Moniliophthora perniciosa (Tricholomataceae) are indistinguishable based on genetic and physiological analysis

Lana¹,

Azevedo²,

Pomella³

et al. 2011

Genet. Mol. Res.

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ABSTRACT. We evaluated the genetic and physiological variability of Moniliophthora perniciosa obtained from healthy and diseased branches of cacao (Theobroma cacao) plants. The diversity of the isolates was evaluated by RAPD technique and by studies of virulence and exoenzyme production. The genetic variability of endophytic and pathogenic M. perniciosa was evaluated in association with pathogenicity assays. RAPD analysis showed eight genetic groups, which were not related to plant disease status (healthy versus diseased branches). Isolates from cacao were included in three groups, excluding isolates from other host plants. Pathogenicity and enzyme analysis showed that the virulence of the isolates is not Endophytic and pathogenic isolates of M. perniciosa related to exoenzyme production. This is the first evidence that M. perniciosa colonizes healthy parenchymatic tissues, showing that endophytic behavior may occur in this species.

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Section: Introductionmentioning

confidence: 99%

Endophytic and pathogenic isolates of the cacao fungal pathogen Moniliophthora perniciosa (Tricholomataceae) are indistinguishable based on genetic and physiological analysis

Lana¹,

Azevedo²,

Pomella³

et al. 2011

Genet. Mol. Res.

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“…The level of accumulation of products or the rapidity of the induction of these defense genes in a host plant is correlated with the degree of its disease resistance (Lawrence et al 1996). The defense responses in plants can also be induced by certain avirulent pathogens (Manandhar et al 1998), non-pathogens (Manandhar et al 1998), rootcolonizing rhizobacteria (Van Loon et al 1998) and chemicals (Oostendorp et al 2001). Induced resistance in plants can be subdivided into two broad categories.…”

Section: Introductionmentioning

confidence: 99%

Oxalic acid-induced resistance toRhizoctonia solaniin rice is associated with induction of phenolics, peroxidase and pathogenesis-related proteins

Jayaraman

Bhuvaneswari

Rabindran

et al. 2010

Journal of Plant Interactions

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Oxalic acid (1 mM) when applied as a foliar spray to rice plants induced resistance to challenge infection with Rhizoctonia solani, the rice sheath blight pathogen. Maximum reduction in sheath blight incidence was observed when the plants were sprayed with oxalic acid three days before inoculation with the fungus. The biochemical alterations in rice plants treated with oxalic acid was also investigated. When rice plants were treated with oxalic acid, a two-fold increase in phenolic content in leaf sheaths was recorded three days after treatment. Phenylalanine ammonia-lyase and peroxidase activities increased significantly starting from two days after treatment. Peroxidase (PO) isozyme analysis indicated that PO-3 and PO-4 were induced two days after treatment with oxalic acid. Western blot analysis revealed that two chitinases (28 and 35 kDa) and two b-1,3-glucanases (30 and 32 kDa) were strongly induced in rice sheaths four to six days after treatment with oxalic acid. Immunoblot analysis of protein extracts from oxalic acid-treated plants demonstrated the induction of a 23 kDa thaumatinlike protein (TLP) cross-reacting with bean TLP antibody. These results suggest that the enhanced activities of defense enzymes and defense-related compounds in oxalic acid-treated rice plants may contribute to resistance against R. solani.

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“…Os indutores são microrganismos saprofíticos, metabólitos microbianos, extratos de plantas, agentes químicos, entre outros (Manandhar et al, 1998). O estado induzido é demonstrado por um aumento na síntese de produtos de defesa vegetal, tais como: proteínas relacionadas à patogênese (quitinases, glucanases, peroxidases), fitoalexinas e compostos sinalizadores (Heil & Bostock, 2002).…”

Section: Introductionunclassified

Quitosana reduz a severidade da antracnose e aumenta a atividade de glucanase em feijoeiro-comum

Piero¹,

Garda²

2008

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar o controle da antracnose em feijoeiro-comum pela aplicação de quitosana. A quitosana foi pulverizada em plantas de feijão-comum, em diferentes concentrações, no estádio V3, em casa de vegetação. As plantas foram também submetidas à inoculação de Colletotrichum lindemuthianum. A dose de 9 mg de quitosana por planta propiciou redução em mais de 50% na severidade da antracnose e não causou fitotoxicidade. O efeito protetor foi local e mais intenso no intervalo de tempo de 4 dias entre tratamento e inoculação. Observou-se redução significativa no crescimento micelial e inibição total da germinação de esporos de C. lindemuthianum, quando se utilizou o polissacarídeo a 1 mg mL -1 e 80 µg mL -1 , respectivamente. Em folhas do feijoeiro, a quitosana provocou o aumento na atividade de glucanase. Quitosana apresenta propriedades antifúngicas contra C. lindemuthianum, bem como potencial para induzir resistência à planta, e pode ser uma alternativa para o controle da antracnose do feijoeiro.Termos para indexação: Phaseolus vulgaris, Colletotrichum lindemuthianum, antibiose, indução de resistência, proteínas relacionadas à patogênese. Chitosan reduces the anthracnose severity and increases the glucanase activity in common bean plantsAbstract -The objective of this work was to evaluate the effect of chitosan on common bean (Phaseolus vulgaris) anthracnose. Different concentrations of chitosan suspension were sprayed on plants at V3 stage, in greenhouse; plants were also infected with Colletotrichum lindemuthianum. The concentration of 9 mg per plant reduced the anthracnose severity in more than 50%, without causing any toxic effect on bean plants. The protecting effect was local and more intense in a time interval of 4 days between treatment and inoculation. Mycelium growth reduction and spore germination inhibition of C. lindemuthianum were observed, when chitosan was used at 1 mg mL -1 and 80 µg mL -1 , respectively. Chitosan increased the glucanase activity in bean leaves. Chitosan presents antifungal properties against C. lindemuthianum, as well as potential to induce resistance on bean plants. Therefore, the plant spraying with chitosan can be an alternative to control anthracnose.

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Suppression of Rice Blast by Preinoculation with Avirulent Pyricularia oryzae and the Nonrice Pathogen Bipolaris sorokiniana

Cited by 66 publications

References 17 publications

Endophytic and pathogenic isolates of the cacao fungal pathogen Moniliophthora perniciosa (Tricholomataceae) are indistinguishable based on genetic and physiological analysis

Endophytic and pathogenic isolates of the cacao fungal pathogen Moniliophthora perniciosa (Tricholomataceae) are indistinguishable based on genetic and physiological analysis

Oxalic acid-induced resistance toRhizoctonia solaniin rice is associated with induction of phenolics, peroxidase and pathogenesis-related proteins

Quitosana reduz a severidade da antracnose e aumenta a atividade de glucanase em feijoeiro-comum

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