Screening of Maintainer lines for Leaf Blast resistance through uniform blast nursery method in rice (Oryza sativa L.)
Kasanaboina Krishna, Y Chandra Mohan, V Gouri Shankar, CHV Durga Rani, L Krishna, T Kiranbabu
An experiment was conducted to evaluate the maintainer lines blast resistance and yield component traits in rice. Present investigation was carried out during rabi 2018-19 with 40 genotypes and TN 1 (susceptible check). The genotypes were screened against leaf blast by adopting Uniform Blast Nursery (UBN) method at Rice Research Centre, Rajendranagar and scored as per Standard Evaluation System (SES) scale (IRRI-2013). Accordingly, based on the disease scoring, the genotypes were categorized as resistant, moderately resistant, moderately susceptible and susceptible types. It was found that 13 lines were resistant to screening reaction, 12 lines were moderately resistant and 10 lines were found to be moderately susceptible and 3 lines were susceptible. Four genotypes viz., JMS 17B, JMS 18B, MTU 1216 and IR-BLZ-F4 were recorded higher mean for yield and its component traits along with blast resistance and hence these genotypes could be directly used as parents for development of heterotic hybrids with blast resistance and higher grain yield. Further the maintainer lines viz., MTU 1216 and IR-BLZ-F4 could be back crossed to any stable Cytoplasmic Male Sterile (CMS) lines for development of new blast resistant CMS lines which can be utilized as female parent in development of heterotic hybrids with leaf blast resistance.