Endophytic Actinomycetes and Their Interactions with Host Plants

Hasegawa, Shingo; Meguro, Akane; Shimizu, Mitsuaki; Nishimura, Takashi; Kunoh, Hitoshi

doi:10.3209/saj.20.72

Cited by 141 publications

(85 citation statements)

References 67 publications

(90 reference statements)

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“…In addition they can act as antagonists against phytopathogens through the production of antibiotics or siderophores, nutrient competition and induction of systemic disease resistance (Kunoh 2002;Lee et al 2004;Bailey et al 2006;Hasegawa et al 2006;Meguro A 2006;Conn 2008;Qin et al 2011). It has also reported that several actinobacteria discovered from plants produce different kinds of secondary metabolites, which might be promising sources of novel antibiotics and growth regulators of other organisms (Castillo et al 2006;Hasegawa et al 2006;Qin et al 2011). Therefore, endophytic actinobacteria are believed to be significant resources, which can be widely used in medicine, agriculture and industry (Strobel and Daisy 2003).…”

Section: Introductionmentioning

confidence: 99%

Isolation and characterization of culturable endophytic actinobacteria associated with Artemisia annua L.

Zhao

Huang

et al. 2011

Antonie van Leeuwenhoek

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Endophytic actinobacteria isolated from Artemisia annua were characterized and evaluated for their bioactivities. A total of 228 isolates representing at least 19 different genera of actinobacteria were obtained and several of them seemed to be novel taxa. An evaluation of antimicrobial activity showed that more isolates possessed activity towards plant pathogens than activity against other pathogenic bacteria or yeasts. High frequencies of PCR amplification were obtained for type I polyketide synthases (PKS-I, 21.1%), type II polyketide synthases (PKS-II, 45.2%) and nonribosomal peptide synthetases (NRPS, 32.5%). The results of herbicidal activity screening indicated that 19 out of 117 samples of fermentation broths completely inhibited the germination of Echinochloa crusgalli. This study indicated that endophytic actinobacteria associated with A. annua are abundant and have potentially beneficial and diverse bioactivities which should be pursued for their biotechnical promise.

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Section: Introductionmentioning

confidence: 99%

Isolation and characterization of culturable endophytic actinobacteria associated with Artemisia annua L.

Zhao

Huang

et al. 2011

Antonie van Leeuwenhoek

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“…Actinomycetes receive a wide attention due to their potential as producers of a large number of useful and diverse function bioactive secondary metabolites such as antibiotics and extracellular enzymes (Inbar et al 2005;El-Tarabily and Sivasithamparam 2006). Actinomycetes have been associated as biocontrol agent in several studies against plant pathogenic fungi and pathogenic bacteria (Hasegawa et al 2006;Baltz 2008;Loqman et al 2009;Oskay 2009). Apart from that, actinomycetes are also able to promote plant growth by the production of phytohormone and indole acetic acid compound (Hamdali et al 2008).…”

Section: Introductionmentioning

confidence: 99%

In vitro Antimicrobial Assay of Actinomycetes in Rice AgainstXanthomonas oryzae pv. oryzicola and as Potential Plant Growth Promoter

Hata

Sijam

Ahmad

et al. 2015

Braz. arch. biol. technol.

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“…They have considerable infl uence in plant growth, protecting roots from pathogenic microorganisms and environmental factors (Hasegawa et al 2006). Some species establish a specifi c relationship with plant tissues, and are called endophytic actinomycetes (Crawford et al 1993).…”

Section: Introductionmentioning

confidence: 99%

“…The benefi t that this relationship represents to plants may result from the production of secondary compounds by these microorganisms. These metabolites may be phytohormones, antibiotics, and siderophores, which act directly on the plant metabolism or affect pathogenic agents by antibiosis or competition (Hasegawa et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of antimicrobial activity of the endophytic actinomycete R18(6) against multiresistant Gram-negative bacteria

Carvalho

Sand

2016

An. Acad. Bras. Ciênc.

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Endophytic actinomycetes are promising sources of antimicrobial substances. This study evaluates the activity of metabolites produced by the endophytic actinomycete R18(6) against Gram-negative bacteria multiresistant to antimicrobials. R18(6) isolate was grown in submerged cultures under different conditions: carbon source, temperature, pH and incubation time to optimize antimicrobials production. The actinomycete grown in base medium supplemented with 1% glucose, pH 6.5 and incubation at 30 ºC for 96 h with shaking at 100 rpm, exhibited the highest activity against the used Gram-negative bacteria. Minimum inhibitory concentration (MIC) of the crude extract produced by the microorganism varied between 1/32 and 1/256. It had bactericide or bacteriostatic activity, depending on the Gram-negative organism. The active extract was stable at high temperatures, and unstable in medium containing proteolytic enzymes. Micromorphology of R18(6) was investigated by optical and scan microscopy, revealing that it was morphologically similar to the genus Streptomyces.

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Endophytic Actinomycetes and Their Interactions with Host Plants

Cited by 141 publications

References 67 publications

Isolation and characterization of culturable endophytic actinobacteria associated with Artemisia annua L.

Isolation and characterization of culturable endophytic actinobacteria associated with Artemisia annua L.

In vitro Antimicrobial Assay of Actinomycetes in Rice AgainstXanthomonas oryzae pv. oryzicola and as Potential Plant Growth Promoter

Evaluation of antimicrobial activity of the endophytic actinomycete R18(6) against multiresistant Gram-negative bacteria

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