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- Screening and identification of Aspergillus activity against Xanthomonas oryzae pv. oryzae and analysis of antimicrobial components
- Bei Jiang , Zhiying Wang , Chuxuan Xu , Weijia Liu , Donghua Jiang
- J. Microbiol. 2019;57(7):597-605. Published online June 27, 2019
- DOI: https://doi.org/10.1007/s12275-019-8330-5
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- 11 Web of Science
- 10 Crossref
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Abstract
-
To screen for Aspergillus activity against Xanthomonas oryzae
pv. oryzae and analyse the antimicrobial components
involved, 60 Aspergillus spp. were isolated and purified from
fruits, soil and other habitats. As-75, an Aspergillus strain that
can antagonize Xanthomonas oryzae pv. oryzae, was identified
based on the zone of inhibition formed during co-culture.
According to morphological, ITS rDNA gene sequencing
and phylogenetic tree results, the strain showed close
homology to Aspergillus sclerotiorum. The biochemical characterization
tests showed that the fermentation broth of strain
As-75 exhibited a high capacity for environmental adaptation.
The results of the antimicrobial spectrum experiments demonstrated
that As-75 exhibited fairly strong antagonistic activity
against five plant pathogenic fungi and six plant pathogenic
bacteria in vitro. The fermentation broth of strain As-75
displayed maximum stability under fluorescent illumination
at temperatures below 60°C at pH 6.5. A substance with antagonistic
activity was obtained from strain As-75 via fractional
extraction, silica gel column chromatography and thinlayer
chromatography. Through mass spectrometry, nuclear
magnetic resonance and electrospray ionization mass spectrometry
(ESI-MS) analyses, the target compound was identified
as (2Z)-2-butenedioic acid-2-(1-methylethenyl)-4-methyl
ester; its molecular weight of 170.06 daltons and formula
of C8H10O4 identify it as a novel compound. Trials of
the preventative and curative effects demonstrated that compound
S1 exhibited a better control efficiency than the control
against rice bacterial blight. Additionally, the M1 processing
method
was better, and the efficiency of compound S1 in preventing rice bacterial blight in six rice varieties, TN1, IR24, ZF802, Zhonghua 11, Wuyunjing 21, and Nipponbare, was 78.3%, 77.5%, 74.2%, 75.3%, 70.9%, and 72.1%, respectively. -
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