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<p>In an exploration of <i>Streptomyces</i> for biocontrol and/or plant growth promoting traits, a total of 208 isolates of <i>Streptomyces</i> were obtained from tomato rhizosphere of Eastern Uttar Pradesh, India. The antagonistic activity against three soil-borne pathogens viz. Fusarium oxysporum f.sp. lycopersici, Sclerotium rolfsii and Rhizoctonia solani revealed that five and thirteen isolates were antagonistic against all three and at least two pathogens, respectively. Inhibition percentage varied from 20.4 ± 2.1 to 63.6 ± 3.5% with highest inhibition by isolate CT1-8 (63.6 ± 3.5%) against R. solani. Maximum activity of chitinase (102.6 ± 2.4 U/ml) and plant growth promoting traits viz. production of siderophore (74.8 ± 0.1%) and ammonia (469.3 ± 4.7 mg/ml) were observed in isolate AT6-60. Isolates could able to grow up to 20% (w/v) NaCl and pH 10.0. Molecular characterization revealed that they belonged to the genus <i>Streptomyces</i> with nine different species which include, <i>Streptomyces</i> tendae, <i>S. chilikensis</i>, <i>S. diastaticus</i> subsp. <i>ardesiacus, S</i>. <i>enissocaesilis</i>, <i>S. africanus</i>, <i>S. cellulosae</i>, <i>S. werraensis</i>, <i>S. erythrogriseus</i>, <i>S. atriruber</i>. Based on the qualitative and quantitative assay for hydrolytic enzyme and PGP traits, <i>S. cellulosae</i> AT6-60 found to be a suitable candidate for biocontrol agent in containing soil-borne diseases in tomato.</p>

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Prospecting Streptomyces spp. Isolated from Tomato Rhizosphere for Biocontrol and Plant Growth Promotion

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Kuppusamy Pandiyan,
  • Prity Kushwaha,
  • Nanjappan Karthikeyan,
  • Arjun Singh,
  • Anil Kumar Saxena

摘要

In an exploration of Streptomyces for biocontrol and/or plant growth promoting traits, a total of 208 isolates of Streptomyces were obtained from tomato rhizosphere of Eastern Uttar Pradesh, India. The antagonistic activity against three soil-borne pathogens viz. Fusarium oxysporum f.sp. lycopersici, Sclerotium rolfsii and Rhizoctonia solani revealed that five and thirteen isolates were antagonistic against all three and at least two pathogens, respectively. Inhibition percentage varied from 20.4 ± 2.1 to 63.6 ± 3.5% with highest inhibition by isolate CT1-8 (63.6 ± 3.5%) against R. solani. Maximum activity of chitinase (102.6 ± 2.4 U/ml) and plant growth promoting traits viz. production of siderophore (74.8 ± 0.1%) and ammonia (469.3 ± 4.7 mg/ml) were observed in isolate AT6-60. Isolates could able to grow up to 20% (w/v) NaCl and pH 10.0. Molecular characterization revealed that they belonged to the genus Streptomyces with nine different species which include, Streptomyces tendae, S. chilikensis, S. diastaticus subsp. ardesiacus, S. enissocaesilis, S. africanus, S. cellulosae, S. werraensis, S. erythrogriseus, S. atriruber. Based on the qualitative and quantitative assay for hydrolytic enzyme and PGP traits, S. cellulosae AT6-60 found to be a suitable candidate for biocontrol agent in containing soil-borne diseases in tomato.