Screening of Rice Germplasm against blast disease for Identification of Resistant Sources

Abstract

Rice Leaf Blast disease is caused by means of Magnaporthe oryzae is one of the major biotic stresses of rice in India. To find the leaf blast resistance sources in rice accessions, an open field investigation was carried in natural and artificial epiphytotic form during rabi seasons in 2018 and 2019. A total of 97 rice genotypes including resistant check (Tetep) and susceptible check (NLR34242 and BPT5204) were grown, in uniform blast nursery (UBN). Rice Leaf blast disease severity assessment was scored according to 0-9 scale. Among rice genotypes,21.6 % were resistant, 29.8 % moderately resistant, 21.6 % moderately susceptible, 29.8 % susceptible and 16.4 % were highly susceptible during rabi 2018 whereas only 18.5 % resistant 29.8 % moderately resistant,15.4 % moderately susceptible and 23 % were susceptible and 12.37 % to rice leaf blast disease during rabi 2019. As per result, these resistant accessions with required agronomical traits can be used in leaf blast resistance breeding program as donor parent for the development of leaf blast resistant varieties in rice.