Differences in the Recognition of Glucan Elicitor Signals between Rice and Soybean: b-Glucan Fragments from the Rice Blast Disease Fungus Pyricularia oryzae That Elicit Phytoalexin Biosynthesis in Suspension-Cultured Rice Cells

2000 ◽  
Vol 12 (5) ◽  
pp. 817 ◽  
Author(s):  
Takeshi Yamaguchi ◽  
Akira Yamada ◽  
Namgi Hong ◽  
Tomoya Ogawa ◽  
Tadashi Ishii ◽  
...  
Keyword(s):  
Rice Blast ◽  
Pyricularia Oryzae ◽  
Rice Blast Disease ◽  
Blast Disease ◽  
Phytoalexin Biosynthesis

scholarly journals Identificação de progênies de arroz resistentes à brusone no Estado de São Paulo, em 1976/77

Bragantia ◽  
1985 ◽  
Vol 44 (1) ◽  
pp. 311-329
Author(s):  
Jaciro Soave ◽  
Luiz Ernesto Azzini ◽  
Octávio Bento de Almeida Camargo ◽  
Armando Pettinelli Júnior ◽  
Mauro Sakai
Keyword(s):  
Rice Blast ◽  
Sao Paulo ◽  
Pyricularia Oryzae ◽  
Rice Blast Disease ◽  
Blast Disease ◽  
São Paulo

Este trabalho apresenta os resultados das pesquisas realizadas para a avaliação da resistência à brusone (Pyricularia oryzae Cav.) dos principais materiais de sequeiro e irrigado do programa de melhoramento genético do Instituto Agronômico do Estado de São Paulo, e de genótipos exóticos, introduzidos de diversos países, visando à obtenção de cultivares de arroz resistentes àquela limitante doença fúngica. Os testes foram realizados em condições de campo, em canteiros padronizados para reação uniforme a P. oryzae, e a avaliação das plantas foi feita através da observação dos sintomas visuais deixados pela doença, aos quais foram atribuídas notas de 1 a 7, conforme a escala de notas adotadas no "Symposium on the rice blast disease", em 1963. Sessenta e três germoplasmas de arroz de sequeiro e trinta de cultivo irrigado foram testados quanto à resistência à brusone na folha, nas seguintes localidades paulistas: Itararé, Mococa, Pariquera-Açu, Pindamonhangaba, Pindorama e Ribeirão Preto. Foram ainda avaliados 102 genótipos exóticos de arroz visando à detecção de fontes de resistência à brusone nas mesmas localidades, além de Campinas. Somente cinco cultivares de sequeiro, GS-73-164, GS-73-165, GS-73-94, IAC-25 e GS-73-17, e dois cultivares de arroz irrigado, IAC-120 e Pinda F-3-7, embora suscetíveis, apresentaram comportamento satisfatório quanto à brusone. Dos genótipos exóticos testados, vinte e sete foram indicados como fontes de resistência à brusone no Estado de São Paulo.

scholarly journals Biocontrol Potential of Endophytic Bacteria Isolated from Healthy Rice Plant against Rice Blast Disease (Pyricularia oryzae Cav.)

2017 ◽  
Vol 2 (6) ◽  
pp. 287 ◽  
Author(s):  
Fitri Widiantini ◽  
Andri Herdiansyah ◽  
Endah Yulia
Keyword(s):  
Endophytic Bacteria ◽  
Rice Blast ◽  
Biocontrol Agent ◽  
Pyricularia Oryzae ◽  
Rice Blast Disease ◽  
Blast Disease ◽  
Dual Culture ◽  
Biocontrol Activity ◽  
Dual Culture Assay ◽  
Biocontrol Potential

Isolation was attempted to collect endophytic bacteria as potential biocontrol agents against rice blast disease (Pyricularia oryzae Cav.). The disease is one of major threats in rice production as it can cause 100% yield loss. Concern on the environment and human health has led to the searching of alternative controlling method to replace the commonly used pesticide-based method. Endophytic bacteria are bacteria that have intimate relationship with their host without inducing any pathogenic symptom. The use of endophytic microbial as biocontrol agent has its own advantages as the microbes are more easily to adapt to the environment needed by the host plant. We evaluated endophytic bacteria isolated from healthy rice plants and tested for their potential biocontrol activity using dual culture assay. Ten isolates were found to inhibit the growth of P. oryzae of more than 50%. Microscopic observation showed that they were able to cause the mycelia malformation of P. oryzae. Further work is currently in progress to determine their effectiveness in the pot trial. Keywords: Endophytic bacteria; Pyricularia oryzae; biocontrol.

scholarly journals Transcriptomic and Ultrastructural Analyses of Pyricularia Oryzae Treated With Fungicidal Peptaibol Analogs of Trichoderma Trichogin

2021 ◽  
Vol 12 ◽  
Author(s):  
Luca Sella ◽  
Rakshita Govind ◽  
Rocco Caracciolo ◽  
Alessandra Quarantin ◽  
Van V. Vu ◽  
...  
Keyword(s):  
Cell Death ◽  
Cell Wall ◽  
Rice Blast ◽  
Fungal Spores ◽  
Molecular Data ◽  
Pyricularia Oryzae ◽  
Rice Blast Disease ◽  
Autophagic Cell Death ◽  
Blast Disease ◽  
Promising Alternative

Eco-friendly analogs of Trichogin GA IV, a short peptaibol produced by Trichoderma longibrachiatum, were assayed against Pyricularia oryzae, the causal agent of rice blast disease. In vitro and in vivo screenings allowed us to identify six peptides able to reduce by about 70% rice blast symptoms. One of the most active peptides was selected for further studies. Microscopy analyses highlighted that the treated fungal spores could not germinate and the fluorescein-labeled peptide localized on the spore cell wall and in the agglutinated cytoplasm. Transcriptomic analysis was carried out on P. oryzae mycelium 3 h after the peptide treatment. We identified 1,410 differentially expressed genes, two-thirds of which upregulated. Among these, we found genes involved in oxidative stress response, detoxification, autophagic cell death, cell wall biogenesis, degradation and remodeling, melanin and fatty acid biosynthesis, and ion efflux transporters. Molecular data suggest that the trichogin analogs cause cell wall and membrane damages and induce autophagic cell death. Ultrastructure observations on treated conidia and hyphae confirmed the molecular data. In conclusion, these selected peptides seem to be promising alternative molecules for developing effective bio-pesticides able to control rice blast disease.

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