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<p>Rice sheath rot, primarily caused by <i>Sarocladium oryzae</i>, has become a major seed-transmitted disease in Asia, with yield reductions reported up to 85%. During the present study, an additional pathogen was detected in symptomatic sheath tissues, necessitating further isolation and identification. Isolation, purification and morphological assessment revealed substantial variability among <i>S. spinificis</i> isolates with respect to colony pigmentation, mycelial characteristics and conidial morphology. Inoculation assays performed through the syringe method induced typical sheath rot symptoms such as brownish-grey lesions and discolored grains by <i>S. spinificis</i>. Molecular profiling using multilocus sequencing of ITS rDNA, ACT, RPB-2 and TEF1-α loci confirmed the identity of both isolates as <i>S. spinificis</i>. Collectively, to the best of our knowledge this work represents the first confirmed report of <i>S. spinificis</i> as a causal organism of sheath rot disease in rice. This finding broadens the current understanding of the pathogen spectrum associated with this economically important disease.</p>

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Sarocladium spinificis: a first report as a causal organism of sheath rot in rice

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Bharathi K.B.,
  • Narayanareddy A.B.,
  • Sanath Kumar V.B.,
  • Denesh G.R.,
  • Ashoka K.R.,
  • Kitturmath M.S.,
  • Varshitha S.,
  • Sneha K.B.,
  • Mummineni Sunitha,
  • Akash Bevanur,
  • Supriya S.,
  • Sanju Jalli,
  • Abhishek R.

摘要

Rice sheath rot, primarily caused by Sarocladium oryzae, has become a major seed-transmitted disease in Asia, with yield reductions reported up to 85%. During the present study, an additional pathogen was detected in symptomatic sheath tissues, necessitating further isolation and identification. Isolation, purification and morphological assessment revealed substantial variability among S. spinificis isolates with respect to colony pigmentation, mycelial characteristics and conidial morphology. Inoculation assays performed through the syringe method induced typical sheath rot symptoms such as brownish-grey lesions and discolored grains by S. spinificis. Molecular profiling using multilocus sequencing of ITS rDNA, ACT, RPB-2 and TEF1-α loci confirmed the identity of both isolates as S. spinificis. Collectively, to the best of our knowledge this work represents the first confirmed report of S. spinificis as a causal organism of sheath rot disease in rice. This finding broadens the current understanding of the pathogen spectrum associated with this economically important disease.