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<p>Rice blast caused by <i>Pyricularia oryzae</i> poses a serious threat to sustainable rice production, particularly in Bangladesh where rice is central to food security. The present study investigated the agronomic and physiological responses of six rice genotypes (BRRI dhan74, BRRI dhan28, BRRI dhan59, BRRI dhan63, BRRI dhan88 and IR 64 as a resistant check) under artificial inoculation during two consecutive Boro seasons (2022–2023 and 2023–2024) and followed a factorial completely randomized design with three replications. Blast infection significantly reduced growth, chlorophyll content, membrane stability and yield components, with marked genotypic variation. BRRI dhan63 exhibited the highest disease severity (PDI 85.18%), maximum electrolyte leakage (41%), lowest membrane stability (60.7%), and greatest grain yield reduction (36.34%), indicating high susceptibility. In contrast, IR 64 and BRRI dhan74 maintained lower disease incidence (PDI 33.33%), higher membrane stability (88.4% and 87.4%, respectively), minimal chlorophyll degradation (≤ 5.5%), and reduced yield losses (12.80% and 16.14%, respectively), demonstrating strong tolerance. Correlation analysis revealed strong positive associations among grain yield, filled grain percentage, SPAD value, and membrane stability (<i>r</i> = 0.95–0.99), while these traits were strongly and negatively correlated with PDI (<i>r</i> = − 0.95 to − 0.99). Principal component analysis explained 96.39% of total variance and effectively distinguished tolerant and susceptible genotypes based on integrated morphophysiological performance. Thus, BRRI dhan74, alongside IR 64, demonstrated superior resilience under <i>P. oryzae</i> infection and may serve as valuable genetic resources for breeding and integrated blast management strategies in Bangladesh.</p>

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Field-based assessment of rice genotypes for agronomic and physiological performance under Pyricularia oryzae infection

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月1日

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  • Joyanti Ray,
  • Mst. Sabiha Sultana,
  • Md. Rezve,
  • Tasnim Tasmiah,
  • Md. Yasin Ali

摘要

Rice blast caused by Pyricularia oryzae poses a serious threat to sustainable rice production, particularly in Bangladesh where rice is central to food security. The present study investigated the agronomic and physiological responses of six rice genotypes (BRRI dhan74, BRRI dhan28, BRRI dhan59, BRRI dhan63, BRRI dhan88 and IR 64 as a resistant check) under artificial inoculation during two consecutive Boro seasons (2022–2023 and 2023–2024) and followed a factorial completely randomized design with three replications. Blast infection significantly reduced growth, chlorophyll content, membrane stability and yield components, with marked genotypic variation. BRRI dhan63 exhibited the highest disease severity (PDI 85.18%), maximum electrolyte leakage (41%), lowest membrane stability (60.7%), and greatest grain yield reduction (36.34%), indicating high susceptibility. In contrast, IR 64 and BRRI dhan74 maintained lower disease incidence (PDI 33.33%), higher membrane stability (88.4% and 87.4%, respectively), minimal chlorophyll degradation (≤ 5.5%), and reduced yield losses (12.80% and 16.14%, respectively), demonstrating strong tolerance. Correlation analysis revealed strong positive associations among grain yield, filled grain percentage, SPAD value, and membrane stability (r = 0.95–0.99), while these traits were strongly and negatively correlated with PDI (r = − 0.95 to − 0.99). Principal component analysis explained 96.39% of total variance and effectively distinguished tolerant and susceptible genotypes based on integrated morphophysiological performance. Thus, BRRI dhan74, alongside IR 64, demonstrated superior resilience under P. oryzae infection and may serve as valuable genetic resources for breeding and integrated blast management strategies in Bangladesh.