Author(s):

R Pushpam, V Ramamoorthy, N Nithya, S Fathima Nasrin, E Meena, VK Parthiban and M Arumugam Pillai

Abstract: Rice sheath rot disease caused by Sarocladium oryzae is one of the important diseases because the pathogen specifically infects flag leaf sheath covering the emerging panicle and also grains severely. The disease incidence is more in warm and humid conditions of tropical countries. The research work was carried out to identify promising resistant germplasm lines for sheath rot disease. Seventy nine rice germplasm were obtained from Department of Plant Breeding and Genetics, TNAU and raised at Agriculture College and Research Institute, Killikulam. The 79 rice germplasm lines were raised in pots in screen house conditions and evaluated for sheath rot resistance. The lines were artificially inoculated with sheath rot pathogen by two methods, attached tiller assay and standard grain inoculation technique. After 15 days of inoculation disease symptoms were scored and classified according to PDI index as resistant and susceptible. We observed 11 germplasm lines as resistant. Mostly tall varieties such as Katuyanam, Kichalisamba etc. was found to be resistant. The scented variety Kothamallisamba was also found to be resistant. The dwarf lines mostly come under the category of susceptible ones. The identified lines can be further used in breeding programs.

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