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<p>Rice blast is one of the foremost destructive rice disease causing serious yield losses under conducive conditions. The most ideal, cost effective and environmentally friendly approach to manage blast disease is the use of resistant cultivars. However, due to high variability, the blast fungus overcomes resistance after a couple of years, so identification of novel broad-spectrum resistance genes is indispensable. In this study, a set of 81 Central Rice Research Institute released varieties (CRVs) were screened against leaf blast resistance at CRRI, Cuttack for two consecutive years. The disease reaction showed that twenty varieties were highly resistant, twenty one showed moderate reaction, and forty varieties were found susceptible. Based on cluster and structure analysis, 81 CRVs were categorized into three groups. The CRVs showed 96% variation among individuals and 4% variation among the population. The principal coordinate analysis partitioned the resistant and susceptible CRVs into different groups. The genetic association was performed using 135 SSR markers to identify the <i>R</i> gene/QTLs conferring resistance to the rice blast. The association study identified 16 genomic regions significantly associated with the leaf blast disease resistance. This study would help in the identification of the potential function, and validation of the candidate <i>R</i> genes/QTLs. The associated genes could be used in developing blast-resistant cultivar through marker-assisted selection.</p>

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Genetic association study of blast resistance in Indian rice varieties using SSR markers

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Manoj Kumar Yadav,
  • U. Ngangkham,
  • Chandrakant Singh,
  • D. Sreekanth,
  • S. R. Prabhukarthikeyan,
  • U. Keerthana,
  • Aditya Kumar,
  • Archana Anokhe,
  • Mudagadde G. Deeksha,
  • D. Pramesh

摘要

Rice blast is one of the foremost destructive rice disease causing serious yield losses under conducive conditions. The most ideal, cost effective and environmentally friendly approach to manage blast disease is the use of resistant cultivars. However, due to high variability, the blast fungus overcomes resistance after a couple of years, so identification of novel broad-spectrum resistance genes is indispensable. In this study, a set of 81 Central Rice Research Institute released varieties (CRVs) were screened against leaf blast resistance at CRRI, Cuttack for two consecutive years. The disease reaction showed that twenty varieties were highly resistant, twenty one showed moderate reaction, and forty varieties were found susceptible. Based on cluster and structure analysis, 81 CRVs were categorized into three groups. The CRVs showed 96% variation among individuals and 4% variation among the population. The principal coordinate analysis partitioned the resistant and susceptible CRVs into different groups. The genetic association was performed using 135 SSR markers to identify the R gene/QTLs conferring resistance to the rice blast. The association study identified 16 genomic regions significantly associated with the leaf blast disease resistance. This study would help in the identification of the potential function, and validation of the candidate R genes/QTLs. The associated genes could be used in developing blast-resistant cultivar through marker-assisted selection.