Isolation and Identification of Actinomycetes

Mondal, Haimanti; Thomas, John; Amaresan, Natarajan

doi:10.1007/978-1-0716-3032-7_23

Cited by 1 publication

(2 citation statements)

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“…Primary morphological features were the first to be examined. JCP1‐7's fundamental attributes on the actinomycete culture medium, Gauserime synthetic agar medium, were observed (Mondal et al., 2023 ). It presented as a circular structure with irregular borders, displaying abundant aerial hyphae that were white and fluffy, with the reverse side of the basal filaments appearing orange‐yellow (Figure 2a ).…”

Section: Resultsmentioning

confidence: 99%

“…Initially, JCP1‐7 was inoculated onto Gauserime synthetic agar medium and incubated for 5 days, after which its morphological characteristics were observed using an optical microscope. To further evaluate its morphological traits across different media, JCP1‐7 was cultured on various substrates, including tryptone (ISP1), yeast extract medium maltose agar (ISP2), oat agar medium (ISP3), starch inorganic salt agar medium (ISP4), glycerine aspartic acid agar culture medium (ISP5), tyrosine glycerine (ISP7), potato dextrose agar (PDA) and Gauserime synthetic medium (Mondal et al., 2023 ). There were five replicates for each culture medium.…”

Section: Methodsmentioning

confidence: 99%

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Inhibition of Monilinia fructicola sporulation and pathogenicity through eucalyptol‐mediated targeting of MfCat2 by Streptomyces lincolnensis strain JCP1‐7

Chen,

Yang,

Chen

et al. 2024

Molecular Plant Pathology

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Peach brown rot, attributed to Monilinia fructicola, presents a significant threat to postharvest peach cultivation, causing losses of up to 80%. With an increasing number of countries, spearheaded by the European Union, imposing bans on chemical agents in fruit production, there is a growing interest in mining highly active antibacterial compounds from biological control strains for postharvest disease management. In this study, we highlight the unique ability of Streptomyces lincolnensis strain JCP1‐7 to inhibit M. fructicola sporulation, despite its limited antimicrobial efficacy. Through GC–MS analysis, eucalyptol was identified as the key compound. Fumigation of diseased fruits with eucalyptol at a concentration of 0.0335 μg cm−3 demonstrated an in vivo inhibition rate against M. fructicola of 93.13%, completely suppressing spore formation. Transcriptome analysis revealed the impact of eucalyptol on multiple pathogenesis‐related pathways, particularly through the inhibition of catalase 2 (Cat2) expression. Experiments with a MfCat2 knockout strain (ΔMfCat2) showed reduced pathogenicity and sensitivity to JCP1‐7 and eucalyptol, suggesting MfCat2 as a potential target of JCP1‐7 and eucalyptol against M. fructicola. Our findings elucidate that eucalyptol produced by S. lincolnensis JCP1‐7 inhibits M. fructicola sporulation by regulating MfCat2, thereby effectively reducing postharvest peach brown rot occurrence. The use of fumigation of eucalyptol offers insights into peach brown rot management on a large scale, thus making a significant contribution to agricultural research.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%