Morphological characterization and screening for sheath blight resistance using Indian isolates of Rhizoctonia solani AG1IA

  • Sanjay K. Goswami
  • Vineeta Singh
  • P. L. Kashyap
  • P. K. Singh
Research Article


Sheath blight of rice caused by Rhizoctonia solani AG1IA is one of the devastating fungal diseases. One hundred and twelve R. solani AG1IA isolates collected from Uttar Pradesh, Uttarakhand and Haryana states of India were studied for their morphological characterization. All the isolates of R. solani AG1IA were classified into five groups on the basis of sclerotial arrangements i.e. Group-1, Group-2, Group-3, Group-4 and Group-5 which contains 28, 35, 44, 3 and 2 isolates, respectively. Majority of the isolates were spatial in growth pattern (38.3%), fast growing (40.1%), light brown colony colour (72.3%), scattered sclerotia (39.2%), deep dark brown sclerotia (91.0%), sclerotial clump formation (32.1%) and micro sized sclerotia (56.2%). The number of sclerotia produced was in the range of 3.7–10.7/5 mm mycelium disc. Two isolates RSV10 and RSJ79 did not produce any sclerotia. Time of initiation of sclerotia formation was varied between 4 and 6 days. Sixty-five isolates showed sclerotia formation on under surface of lid. Principal component analysis (PCA) of growth rate and number of sclerotia of R. solani AG1IA showed 100.00 and 86.84% variation, respectively. A field trial with 261 rice germplasm was conducted during the 2013–2014 and 2014–2015 Kharif seasons to screen the R. solani AG1IA resistant germplasm. Mean percent disease index (PDI) varied between 22.95 and 27.40%. On the basis of AUDPC (area under disease progress curve) values, rice germplasm lines belonged to 5 groups i.e. resistant, 57 (262.93–957.92), moderately resistant, 169 (957.93–1220.87), moderately susceptible, 14 (1220.88–1490.81), susceptible, 18 (1490.82–1753.75) and highly susceptible, 3 (1753.76–2016.69).


Morphological Screening Sheath blight Resistance Rhizoctonia solani AG1IA Area under disease progress curve (AUDPC) 



The authors are thankful to the Head, Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India for supporting this work.

Supplementary material

42360_2018_103_MOESM1_ESM.docx (40 kb)
Supplementary material 1 (DOCX 40 kb)


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Copyright information

© Indian Phytopathological Society 2019

Authors and Affiliations

  • Sanjay K. Goswami
    • 1
  • Vineeta Singh
    • 2
  • P. L. Kashyap
    • 3
  • P. K. Singh
    • 4
  1. 1.ICAR-National Bureau of Agriculturally Important MicroorganismsMauIndia
  2. 2.Department of Mycology and Plant Pathology, Institute of Agricultural SciencesBanaras Hindu UniversityVaranasiIndia
  3. 3.ICAR-Indian Institute of Wheat and Barley ResearchKarnalIndia
  4. 4.Department of Genetics and Plant Breeding, Institute of Agricultural SciencesBanaras Hindu UniversityVaranasiIndia

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