Biological Control of Rhizoctonia solani, the Causal Agent of Rice Sheath Blight by Antagonistics Bacteria in Greenhouse and Field Conditions

2004 ◽  
Vol 3 (2) ◽  
pp. 88-96 ◽  
Author(s):  
Mostapha Niknejad K
Keyword(s):  
Biological Control ◽  
Rhizoctonia Solani ◽  
Sheath Blight ◽  
Causal Agent ◽  
Field Conditions ◽  
Rice Sheath Blight

scholarly journals Expression of the pathogenesis related proteins, NH-1, PAL, and lipoxygenase in the iranian Tarom and Khazar rice cultivars, in reaction to Rhizoctonia solani – the causal agent of rice sheath blight

2014 ◽  
Vol 54 (1) ◽  
pp. 36-43 ◽  
Author(s):  
Mohammad Sayari ◽  
Valiollah Babaeizad ◽  
Mohammad Ali Tajick Ghanbari ◽  
Heshmat Rahimian
Keyword(s):  
Rhizoctonia Solani ◽  
Defense Responses ◽  
Sheath Blight ◽  
Causal Agent ◽  
Post Inoculation ◽  
Rice Sheath Blight ◽  
Defense Genes ◽  
Pr Genes ◽  
Pathogenesis Related ◽  
Expression Rate

Abstract Pathogenesis related (PR) genes of rice are among the most important defense genes in the interaction of rice with pathogens. In this study, the role of NH-1, several PR genes, phenylalanine ammonia-lyase (PAL), and lipoxygenase in the defense responses of rice against Rhizoctonia solani, the causal agent of rice sheath blight disease, was evaluated. The Tarom and Khazar cultivars (cvs), as resistant and susceptible genotypes, respectively, were used. The expression rate of defense genes in two-week-old seedlings inoculated with a virulent isolate of R. solani AG-I-1 A was investigated. The lesions in the Tarom cv were less than half the size of those on the Khazar cv. The expression scripts of the genes were calculated by quantative Real-Time PCR (RT-PCR). Results showed that the expression rate of all genes in the resistant cultivar was higher than that of the susceptible genotype, post inoculation. Analysis of data by the t-Student test also indicated significant differences in the expression level of the genes between Khazar and Tarom. The results of this study suggest that the investigated genes are involved in the resistance responses of rice against the sheath blight agent. For the first time, the induction of PR-5, PR-9, PR-10, PR-12, PR-13, and NH-1 was observed in this study in the resistant and susceptible Iranian cultivars of rice following attacks by R. solani.

Isolation and characterization of a melanin from Rhizoctonia solani, the causal agent of rice sheath blight

2015 ◽  
Vol 142 (2) ◽  
pp. 281-290 ◽  
Author(s):  
Jianyi Chen ◽  
Chenjiaozi Wang ◽  
Canwei Shu ◽  
Minghai Zhu ◽  
Erxun Zhou
Keyword(s):  
Rhizoctonia Solani ◽  
Sheath Blight ◽  
Causal Agent ◽  
Rice Sheath Blight ◽  
Isolation And Characterization

scholarly journals Majoritary compounds identified in essential oils of Cymbopogon species inhibits Rhizoctonia solani, causal agent of rice sheath blight

2020 ◽  
Vol 3 (2) ◽  
pp. 562-574
Author(s):  
Klaus Konrad Scheuermann ◽  
Fabiano Cleber Berltoldi ◽  
Bernardo Scarabelot Pazini ◽  
Marcelo Mendes Haro ◽  
Andrey Martinez Rebelo
Keyword(s):  
Essential Oils ◽  
Rhizoctonia Solani ◽  
Sheath Blight ◽  
Causal Agent ◽  
Rice Sheath Blight

Effects of straw incorporation on Rhizoctonia solani inoculum in paddy soil and rice sheath blight severity

2013 ◽  
Vol 152 (5) ◽  
pp. 741-748 ◽  
Author(s):  
H. ZHU ◽  
Z. X. WANG ◽  
X. M. LUO ◽  
J. X. SONG ◽  
B. HUANG
Keyword(s):  
Rhizoctonia Solani ◽  
Disease Severity ◽  
Rice Straw ◽  
Paddy Soil ◽  
Sheath Blight ◽  
Soil Productivity ◽  
Rice Sheath Blight ◽  
Important Method ◽  
Pathogen Dynamics ◽  
Straw Incorporation

SUMMARYIncorporation of rice straw into soil has traditionally been an important method of recycling nutrients and improving soil productivity. Currently, although the effects of straw incorporation on disease severity have been documented, the dynamics of the pathogen in soil after straw incorporation are poorly understood. In the present study, rice straw with various proportions of diseased straw was incorporated at three separate locations (SuPu town, SuSong County and FengYang County) in Anhui province, China. The pathogen dynamics in paddy soil and disease severity of sheath blight during two continuous years from April 2010 to April 2012 were investigated. For all three locations, the amount of pathogen inoculum that persisted in the soil increased with increases in the proportion of diseased straw incorporated. Incorporation of 0·3 and 0·5 diseased straw into soil increased the amount of pathogen inoculum in the soil significantly, whereas incorporation of 0·1 diseased straw into soil had no significant effect on the pathogen inoculum compared with the control (no straw incorporated) or disease severity. Incorporation of healthy rice straw (no disease) resulted in a significant decrease in disease severity, whereas proportions of 0·3 and 0·5 diseased straw resulted in a significant increase of disease severity compared with the control. These results suggested that incorporation of diseased straw enhanced pathogen numbers in soil during the whole decomposition period and increased disease severity. To avoid soil-borne disease accumulation, severely diseased straw should be removed from the field or pre-treated before incorporation.

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