Genetic improvement of RNR 15048 for blast resistance by using UBN phenotypic screening method
Abstract
Rice blast, caused by Magnaporthe oryzae, remains one of the most severe biotic stresses, leading to major yield losses. Breeding for host resistance is the most sustainable and eco-friendly approach to mitigate these losses. RNR 15048 (Telangana Sona), a popular cultivar known for its desirable grain quality and low glycemic index, lacks durable resistance to blast. To enhance its resistance profile, a breeding program was undertaken at Institute of Rice Research, ARI, Rajendranagar, Hyderabad. Subsequently, Pi54, a major blast resistance gene, was introgressed into RNR 15048 through marker-assisted pedigree breeding using MTU1010 NILs as donors. Fifty F7 progenies were phenotypically screened for blast resistance during Rabi 2024-25 under UBN conditions for identification of improved lines. Advanced breeding lines were evaluated in a Uniform Blast Nursery (UBN) using SES (0-9 scale). Susceptible (TN1) and resistant (NLR 34449) checks validated the screening. Of these 50 advanced breeding lines, 21 showed resistant reaction with a disease reaction score of 3, while 6 lines were moderately resistant with a disease reaction score of 5 and other 23 lines showed Highly resistant reaction with a disease reaction score of 1. While Susceptible check TN1 showed highly susceptible reaction with a disease reaction score of 9 and resistant (NLR 34449) check is one.
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- Twenty-Five Years of Pi54: Discovery, Deployment, and Its Role in Silent Revolution in Rice Breeding ↗
Tilak Raj Sharma, B. N. Devanna, Rajeev Rathour, Maganti Sheshu Madhav, Alok Das, Soham Ray et al. · Rice Science · 2026
Rice blast, caused by the fungal pathogen Magnaporthe oryzae , remains a major constraint to rice productivity. To date, more than 100 blast resistance (R) genes have been mapped and about 50 of them, including alleles and orthologues, have been cloned and functionally characterized. Among these, Pi54 , originally identified in the Tetep rice line, encodes a leucine-rich repeat protein…
❝ 0PDF - Identification of blast-resistant advanced rice breeding lines through uniform blast nursery screening
Ch. Divya Rani, K Sukumar, B Laxmi Prasanna, T. Kiran Babu · International Journal of Advanced Biochemistry Research · 2026
Rice blast caused by Magnaporthe oryzae is a major constraint in rice production, leading to severe yield losses under favourable conditions. Developing resistant varieties is considered the most effective and eco-friendly strategy to manage the disease. RNR 15048 (Telangana Sona), a widely cultivated variety known for its fine grain quality and low glycemic index, lacks durable resistance to blast. To enhance the resistance, a breeding programme was carried out at the Rice Research Unit, ARI, Rajendranagar, Hyderabad. The major blast resistance gene Pi54 was introgressed into RNR 15048 throug
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