Vol. 10, Issue 10 (2021)

Author(s):
Yuvarani R, Brindhadevi S, Thiruvudainambi S, Theradimani M, Vanniarajan C and Renuka R

Abstract:
Grain discolouration is an emerging disease that reduced the production and productivity of rice. The disease associated number of pathogenic and saprophytic fungi that infect rice grains both in field and storage conditions. A study was carried out to assess the percent disease index and to identify the causal agent of grain discolouration among the popular rice variety growing in various district of Tamilnadu. The result indicated that the maximum PDI was recorded in 37.5% in TKM13 and the least PDI (22.0%) was recorded in CO51 rice variety. The initial identification revealed that Curvularia spp. was predominant in rice grain samples expression of the symptoms of grain discolouration collected from the various districts of Tamilnadu. NCBI- BLAST has confirmed the pathogen as Curvularia lunata, based on the amplification and sequence analysis of internal transcribed spacer (ITS) region of the rDNA. Pathogenicity test has also proved the cause of grain discolouration by Curvularia spp.