Vishal Kumar¹, Amarendra Kumar¹*, Uday Kumar¹, Matlooba Naseem¹, Brajendra² and Munna Lal³

¹Department of Plant Pathology, Bihar Agricultural University, Sabour, Bhagalpur, ²Indian Institute of Rice Research, Hyderabad, India
³ICAR-CRIDA Santoshnagar, Hyderabad, India

*Corresponding Author:Amarendra Kumar; Department of Plant Pathology, Bihar Agricultural University, Sabour, Bhagalpur, Hyderabad, India.

Received: August 28, 2025; Published: October 08, 2025

Abstract

Rice (Oryza sativa L.) is a staple food crop for more than half of the world’s population. It is cultivated in more than 100 countries with approx. 90 % production from Asia and nearly 3 billion people depends on rice for their 20 % of the daily calorie intake.  Brown spot disease, incited by Drechslera oryzae, poses a major constraint to rice yield-especially in rainfed and humid agro-climatic zones. To promote durable resistance, identifying and screening resistant genotypes is imperative. In this pursuit, a field investigation was undertaken during the Kharif season of 2023 at Bihar Agricultural University, Sabour, involving 421 rice genotypes under the National Screening Nursery-1 (NSN-1). The genotypic evaluation revealed marked variation in disease response across entries. Among 421 genotypes in NSN-1, one genotype PR 124 was found immune (disease score ‘0’) and only 55 genotypes having designation no. MTU 1382, BRR 0181-IR 93827-2-1-1-4, BRR 0180-IR14L157, WGL 1495, RP 6317-RMS-S35-BC2F4-49-25-12-18, Varadhan, Swarna, CR 4392-RGA-16, Rasi, RP Bio 4918-B-B-166-23, RP 6252-BV / RIL-BV202, CR 3562-2-1-1-3-1-1, CR 4387-RGA-271, RP 6689-PyF-111-23, CR 4075-1341-3-3-2-2-1 4-3, MTU 1390, AD 16124, PR 121, HRI-209, CR 4331-74-2-2-1, Naveen, Pusa 2090-17-20, JGL 38206, RNE-0456, RNE-0463, PR-121, RP 6741-RAF-2607-IJ-2, JGL 38105, CO-39, etc. were rated as resistant (disease score ‘1’). Furthermore, 131 genotypes were categories as moderately resistant, 114 as moderately susceptible, 92 as susceptible, and 28 as highly susceptible. These results offer critical insights into rice genotypic resistance against brown spot and highlight promising candidates for incorporation into breeding programs aimed at enhancing disease resilience and ensuring stable rice productivity.

Keywords: Rice; Brown Spot; Drechslera Oryzae; Field Evaluation

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Citation

Citation: Amarendra Kumar., et al. “Field Evaluation of Rice(Oryza Sativa L.) Genotypes for Resistance against Brown Spot Disease (Drechslera Oryzae)". Acta Scientific Agriculture 9.10 (2025): 01-08.

Copyright

Copyright: © 2025 Amarendra Kumar., et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.