scholarly journals Effect of a Multiline of Rice Cultivar Sasanishiki and Its Isogenic Lines on Suppressing Rice Blast Disease.

1996 ◽  
Vol 62 (3) ◽  
pp. 227-233 ◽  
Author(s):  
Toshihiko NAKAJIMA ◽  
Ryoichi SONODA ◽  
Hiroshi YAEGASHI
Keyword(s):  
Rice Blast ◽  
Rice Cultivar ◽  
Rice Blast Disease ◽  
Blast Disease ◽  
Isogenic Lines

scholarly journals The Control of Rice Blast Disease by the Novel Biofungicide Formulations

2019 ◽  
Vol 11 (12) ◽  
pp. 3449
Author(s):  
Wen-Ching Chen ◽  
Tai-Ying Chiou ◽  
Aileen L. Delgado ◽  
Chien-Sen Liao
Keyword(s):  
Rice Blast ◽  
Rice Field ◽  
Rice Cultivar ◽  
Rice Blast Disease ◽  
Blast Disease ◽  
Rice Hull ◽  
The Novel ◽  
Novel Treatments ◽  
Rice Field Soil ◽  
Vitro Test

The study aims to develop novel biofungicide formulations against rice blast disease. A total of 300 rhizobacteria strains were isolated from rice field soil and were examined for the inhibition of Magnaporthe oryzae growth in a vitro test. Among them, only six rhizobacteria showed inhibition against M. oryzae. The three strains that showed the highest inhibition were Bacillus subtilis 5, B. cereus 3S5, and Pseudomonas fluorecens 10S2. A rice hull mixture and liquid medium were mixed with the above-mentioned bacterial suspensions into three bacterial formulas and tested separately on the rice cultivar UPLRi-5 after infection by M. oryzae under a controlled condition. The three novel biofungicide formulas significantly inhibited rice blast disease intensity with a mean disease control rate being approximately 31% higher than the control. The formulas proved to be effective and should be considered as promising novel treatments for rice blast disease.

scholarly journals Evaluation of Biocontrol Activities of Streptomyces spp. against Rice Blast Disease Fungi

Pathogens ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 126 ◽  
Author(s):  
Mathurot Chaiharn ◽  
Teerayut Theantana ◽  
Wasu Pathom-aree
Keyword(s):  
Rice Blast ◽  
Dry Weight ◽  
Rice Cultivar ◽  
Rice Blast Disease ◽  
Blast Disease ◽  
Rrna Gene ◽  
Bacterial Strains ◽  
Streptomyces Spp ◽  
Commercially Important

Rhizosphere bacteria can positively influence plant growth by direct and indirect mechanisms. A total of 112 bacterial strains were isolated from the rhizosphere of rice and tested for plant beneficial activities such as siderophore production, cell-wall-degrading enzyme production, hydrogen cyanide (HCN) production and antifungal activity against rice blast disease fungus. The actinomycetes count was 3.8 × 106 CFU/g soil. Streptomyces strains PC 12, D 4.1, D 4.3 and W1 showed strong growth inhibition of blast disease fungus, Pyricularia sp. (87.3%, 82.2%, 80.0% and 80.5%) in vitro. Greenhouse experiments revealed that rice plants treated with Streptomyces strain PC 12 recorded maximum plant height, root length and root dry weight compared to the control. Taxonomic characterization of this strain on the basis of 16S rRNA gene sequence led to its identification as Streptomyces palmae PC 12. Streptomyces palmae PC 12 may be used as biofertilizer to enhance the growth and productivity of commercially important rice cultivar RD6 and the biocontrol of blast disease fungus.

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 Remote Sensing of Occurrence Place of Rice Blast Disease by Infrared Thermal Image.

1995 ◽  
Vol 64 (3) ◽  
pp. 467-474 ◽  
Author(s):  
Haruhiko YAMAMOTO ◽  
Yoshinori SUZUKI ◽  
Masanori IWANO ◽  
Seiji HAYAKAWA
Keyword(s):  
Remote Sensing ◽  
Rice Blast ◽  
Thermal Image ◽  
Rice Blast Disease ◽  
Blast Disease

scholarly journals Role of two metacaspases in development and pathogenicity of the Rice Blast fungus, Magnaporthe oryzae

2020 ◽  
Author(s):  
Jessie Fernandez ◽  
Victor Lopez ◽  
Lisa Kinch ◽  
Mariel A. Pfeifer ◽  
Hillery Gray ◽  
...  
Keyword(s):  
Cell Death ◽  
Food Security ◽  
Life Cycle ◽  
Magnaporthe Oryzae ◽  
Rice Blast ◽  
Rice Blast Disease ◽  
Blast Disease ◽  
Complex Life Cycle ◽  
Insight Into

ABSTRACTRice blast disease caused by Magnaporthe oryzae is a devastating disease of cultivated rice worldwide. Infections by this fungus lead to a significant reduction in rice yields and threats to food security. To gain better insight into growth and cell death in M. oryzae during infection, we characterized two predicted M. oryzae metacaspase proteins, MoMca1 and MoMca2. These proteins appear to be functionally redundant and are able to complement the yeast Yca1 homologue. Biochemical analysis revealed that M. oryzae metacaspases exhibited Ca2+ dependent caspase activity in vitro. Deletion of both MoMca1 and MoMca2 in M. oryzae resulted in reduced sporulation, delay in conidial germination and attenuation of disease severity. In addition, the double ΔMomca1mca2 mutant strain showed increased radial growth in the presence of oxidative stress. Interestingly, the ΔMomca1mca2 strain showed an increase accumulation of insoluble aggregates compared to the wild-type strain during vegetative growth. Our findings suggest that MoMca1 and MoMca2 promote the clearance of insoluble aggregates in M. oryzae, demonstrating the important role these metacaspases have in fungal protein homeostasis. Furthermore, these metacaspase proteins may play additional roles, like in regulating stress responses, that would help maintain the fitness of fungal cells required for host infection.IMPORTANCEMagnaporthe oryzae causes rice blast disease that threatens global food security by resulting in the severe loss of rice production every year. A tightly regulated life cycle allows M. oryzae to disarm the host plant immune system during its biotrophic stage before triggering plant cell death in its necrotrophic stage. The ways M. oryzae navigates its complex life cycle remains unclear. This work characterizes two metacaspase proteins with peptidase activity in M. oryzae that are shown to be involved in the regulation of fungal growth and development prior to infection by potentially helping maintain fungal fitness. This study provides new insight into the role of metacaspase proteins in filamentous fungi by illustrating the delays in M. oryzae morphogenesis in the absence of these proteins. Understanding the mechanisms by which M. oryzae morphology and development promote its devastating pathogenicity may lead to the emergence of proper methods for disease control.

scholarly journals Diagnosis of Rice Blast Disease in Different Environmental Conditions using Image Processing Technique

2020 ◽  
Vol 17 (100) ◽  
pp. 17-28
Author(s):  
Ezzatollah Askari Asli Ardeh ◽  
mohammad reza larijani ◽  
Reyhaneh Loni ◽  
◽  
◽  
...  
Keyword(s):  
Image Processing ◽  
Environmental Conditions ◽  
Rice Blast ◽  
Processing Technique ◽  
Rice Blast Disease ◽  
Blast Disease ◽  
Image Processing Technique

Microconidia: Understanding Its Role in the Fungus Magnaporthe oryzae Inciting Rice Blast Disease

2021 ◽  
pp. 143-150
Author(s):  
Ganesan Prakash ◽  
Asharani Patel ◽  
Ish Prakash ◽  
Kuleshwar Prasad Sahu ◽  
Rajashekara Hosahatti ◽  
...  
Keyword(s):  
Magnaporthe Oryzae ◽  
Rice Blast ◽  
Rice Blast Disease ◽  
Blast Disease
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