Screening of Soybean Genotypes for Resistance to Root rot Disease caused by Rhizoctonia solani in Assam condition

Author: Priyankee Dutta, Munmi Borah and Prasanta Kumar Goswami

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Abstract

The productivity of Soybean in Assam condition is greatly hampered by the numerous biotic factors. Frequent rainfall in the area provides a suitable environment for occurrence of numerous diseases. Among all the diseases affecting soybean, Rhizoctonia rot is worth mentioning. The wide host range of the pathogen causes difficulty in its management and so developing resistant genotypes against the pathogen is of great importance. Screening genotypes for developing resistance can help us to reduce the impact of the disease and reduce crop losses. Forty varieties received from AICRP (All India Coordinated research Project) on soybean were evaluated at Jorhat, Assam under green house and field conditions during the year 2018 and 2019 to identify sources of genetic resistance against rhizoctonia root rot disease incited by the Rhizoctonia solani. The fungus was isolated from diseased soybean seedlings collected from ICR farm at seedling stage, purified and maintained on PDA. Fungus inoculated soil was prepared and seeds were sown.In greenhouse experiment, out of 40 soybean varieties no varieties exhibited immune and resistant reaction, 22 varieties exhibited moderately resistant reaction, 12 varieties exhibited moderately susceptible reaction and 4 varieties exhibited highly susceptible reaction. Under the field conditions, the PDI varied from 6.2 to 24 % with highest disease severity shown by HIMSO-1689 variety.

Keywords

Rhizoctonia root rot, Rhizoctonia solani, Soybean, Genetic resistance

Conclusion

As a conclusion, from this experiment it was noted that both field and greenhouse screening showed similar results. None of the genotypes was found immune or resistant to the pathogen. Only 22 genotypes namely PS1637, JS21-71, MACS1566, SL1191, HIMSO1688, PS24, RSC11-17, MAUS734, Dsb33, NRC138, PS1347, NRC139, SL1171, MAUS732, NRC148, RVSM2011-35, VLS97, NRCSL2, KDS1009, BAUS100, BRAGG, JS335 however showed moderate resistance against the pathogen. Later, findings of root rot genes for resistance from above sources may help to develop new soybean cultivars with improved root rot resistance.

References

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How to cite this article

Priyankee Dutta, Munmi Borah and Prasanta Kumar Goswami (2023). Screening of Soybean Genotypes for Resistance to Root rot Disease caused by Rhizoctonia solani in Assam condition. Biological Forum – An International Journal, 15(1): 252-257.