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<p><i>Ustilaginoidea virens</i>, a causal agent of rice false smut (RFS) disease, is one of the threatening fungi that affects the quality and quantity of rice production. The fungus transforms rice spikelets into ball-like structures consist of mycelia and spores, with their size varying according to the rice variety. Initially, the ball appeared white to greyish-white and later changed to various colors such as yellow, orange-yellow, greenish-black, depending on their stage of maturity. A detailed scan of 79 isolates collected from 61 locations belonging to 49 blocks of 28 districts of different states covering 8 agroecological regions of India revealed many morpho-cultural variations. The colony size of the isolates varied, as their growth patterns ranged from slow to fast. The lowest growth was observed in FSm-85 (15&#xa0;mm) whereas the biggest was observed in FSm-5 (54&#xa0;mm). Variable colony texture, like compact cottony to fluffy raised. Interestingly, growth rate was not proportional to the sporulation period; with some isolates exhibiting fast-growing, while others were slow-growing. Colony color changes depended on sporulation and maturity period. Morphology-based similarity index was low (38%). Molecular-based sequence identity and phylogenetic analysis grouped the isolates into two clusters, indicating genetic variations among the isolates while suggesting a common lineage. This is one of the first vivid analyses of morpho-cultural and molecular variabilities of isolates of <i>U. virens</i> collected geographically vast areas of India.</p>

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Morpho-cultural and molecular characterization of Ustilaginoidea virens isolates collected from diverse geographical regions of India

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Manas Kumar Bag,
  • Prahlad Masurkar,
  • Anuprita Ray,
  • Amrita Banerjee

摘要

Ustilaginoidea virens, a causal agent of rice false smut (RFS) disease, is one of the threatening fungi that affects the quality and quantity of rice production. The fungus transforms rice spikelets into ball-like structures consist of mycelia and spores, with their size varying according to the rice variety. Initially, the ball appeared white to greyish-white and later changed to various colors such as yellow, orange-yellow, greenish-black, depending on their stage of maturity. A detailed scan of 79 isolates collected from 61 locations belonging to 49 blocks of 28 districts of different states covering 8 agroecological regions of India revealed many morpho-cultural variations. The colony size of the isolates varied, as their growth patterns ranged from slow to fast. The lowest growth was observed in FSm-85 (15 mm) whereas the biggest was observed in FSm-5 (54 mm). Variable colony texture, like compact cottony to fluffy raised. Interestingly, growth rate was not proportional to the sporulation period; with some isolates exhibiting fast-growing, while others were slow-growing. Colony color changes depended on sporulation and maturity period. Morphology-based similarity index was low (38%). Molecular-based sequence identity and phylogenetic analysis grouped the isolates into two clusters, indicating genetic variations among the isolates while suggesting a common lineage. This is one of the first vivid analyses of morpho-cultural and molecular variabilities of isolates of U. virens collected geographically vast areas of India.