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<p>Leaf spot disease caused by <i>Colletotrichum siamense</i> is a significant fungal threat to various plants, including Aloe vera. Ten <i>Trichoderma</i> isolates (T<sub>1</sub> to T<sub>10</sub>) were obtained from the rhizosphere of Aloe vera through serial dilution and assessed for their antagonistic activity using a dual culture technique. Among these isolates, five- T<sub>1</sub>, T<sub>3</sub>, T<sub>4</sub>, T<sub>5</sub>, and T<sub>7</sub> demonstrated the greatest suppression of radial growth of <i>C. siamense</i>, along with high sporulation rates. In pot tests, isolate T<sub>3</sub> emerged as particularly effective, enhancing plant weight by 144.30%, shoot length by 42.40%, shoot biomass by 144.40%, root length by 200%, root biomass by 146.20%, and leaf number by 20.80%. Additionally, T<sub>3</sub> significantly reduced the severity of leaf spot disease, achieving a 77.44% decrease in disease severity. The isolate T<sub>3</sub> was confirmed as <i>Trichoderma asperellum</i> through morphological and molecular characterization. Its internal transcribed spacer (ITS) sequence was submitted to the NCBI GenBank, where it was assigned the accession number PP565067. These findings underscore the potential of <i>T. asperellum</i> as an effective biocontrol agent, promoting healthier growth in Aloe vera while simultaneously managing leaf spot disease, making it a promising solution for sustainable agriculture practices.</p>

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Evaluating the bioactivity of Trichoderma asperellum against Colletotrichum siamense and its growth-promoting effects on Aloe vera (Aloe barbadensis Mill.)

  • 期刊论文

  • 发表日期：

    2025年1月18日

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  • Ankur Mukhopadhyay,
  • Soumik Mukherjee,
  • Subham Dutta,
  • Sahely Kanthal,
  • Goutam Mondal

摘要

Leaf spot disease caused by Colletotrichum siamense is a significant fungal threat to various plants, including Aloe vera. Ten Trichoderma isolates (T1 to T10) were obtained from the rhizosphere of Aloe vera through serial dilution and assessed for their antagonistic activity using a dual culture technique. Among these isolates, five- T1, T3, T4, T5, and T7 demonstrated the greatest suppression of radial growth of C. siamense, along with high sporulation rates. In pot tests, isolate T3 emerged as particularly effective, enhancing plant weight by 144.30%, shoot length by 42.40%, shoot biomass by 144.40%, root length by 200%, root biomass by 146.20%, and leaf number by 20.80%. Additionally, T3 significantly reduced the severity of leaf spot disease, achieving a 77.44% decrease in disease severity. The isolate T3 was confirmed as Trichoderma asperellum through morphological and molecular characterization. Its internal transcribed spacer (ITS) sequence was submitted to the NCBI GenBank, where it was assigned the accession number PP565067. These findings underscore the potential of T. asperellum as an effective biocontrol agent, promoting healthier growth in Aloe vera while simultaneously managing leaf spot disease, making it a promising solution for sustainable agriculture practices.