Sheath rot and its association with discolouration of rice

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dc.contributor.advisorAnju Bala
dc.contributor.authorSarbjit Kaur
dc.date.accessioned2024-01-05T09:51:59Z
dc.date.available2024-01-05T09:51:59Z
dc.date.issued2021
dc.description.abstractThe present investigation was undertaken with the objective to find out the association of pathogens causing grain discolouration and sheath rot of rice and to identify the resistance sources against sheath rot in rice germplasm. Four pathogens viz., Sarocladium oryzae, Fusarium verticillioides, Fusarium fujikuroi and Albifimbria terrestris were found associated with sheath rot and grain discoloration of rice. The fungal pathogens were inoculated on plants using syringe inoculation, grain insertion method and spray inoculation on 2 varieties, PR 114 and PR 121. The variety PR 114 was more susceptible to fungal disease as compared to PR 121. Plants inoculated with grain insertion method showed high disease incidence followed by syringe inoculation method. Among all the pathogens, S. oryzae caused maximum per cent disease incidence and severity followed by F. verticillioides, F. fujikuroi and A. terrestris. The highest disease progress was also observed in plants inoculated with S. oryzae. All the pathogens produced similar disease symptoms in rice. All the pathogens caused chaffiness of panicles, significant reduction in seed germination, seedling length and vigor index was observed in highly infected seeds. The seed quality deterioration was directly proportional to the intensity of seed infection. Further, the effect of fungal metabolites extracted from discoloured grains was observed on physiological and biochemical parameters by dipping seeds in these metabolites for different durations. The seed quality losses were increased with the increase in duration of seed dipping in fungal metabolites. Significant reduction in total sugars and total proteins along with an increase in defense related enzymes, amino acids, proline, total phenols and malondialdehyde content was recorded. Fifty advanced breeding lines of promising rice germplasm were screened against sheath rot by inoculating three pathogens S. oryzae, F. verticillioides and F. fujikuroi using two inoculation techniques (syringe inoculation and grain insertion). Among all the lines evaluated against sheath rot, RYT 3886 was found to be resistant and RYT 3836 was moderately resistant to all the three pathogens.en_US
dc.identifier.citationSarbjit Kaur (2021). Sheath rot and its association with discolouration of rice (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810205776
dc.keywordsSheath rot, grain discolouration, Oryzae sativa, Sarocladium oryzae, Fusarium, Albifimbriaen_US
dc.language.isoEnglishen_US
dc.pages82en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemSheath rot and its association with discolouration of riceen_US
dc.subPlant Pathologyen_US
dc.themeSheath rot and its association with discolouration of riceen_US
dc.these.typeM.Scen_US
dc.titleSheath rot and its association with discolouration of riceen_US
dc.typeThesisen_US
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