Penicillin Trunk Injection Affects Bacterial Community Structure in Citrus Trees.

Abstract:

:Huanglongbing (HLB), caused by Candidatus Liberibacter asiaticus (CLas), an uncultured α-proteobacterium, is the most destructive disease of citrus trees worldwide. In previous studies, trunk injections of penicillin reduced CLas titers and HLB symptoms in citrus. However, antibiotic effects on the whole plant microbial community, which include effects on taxa that interact with CLas, have not yet been addressed. In this study, we investigated the effects of penicillin injection (0, 1000, and 6000 mg L-1) on rhizospheric and endophytic bacterial communities of grapefruit trees in field and greenhouse experiments through culture-independent high-throughput sequencing. DNA extractions from petioles and roots were subjected to 16S rRNA high-throughput sequencing, and reads were clustered by sequence similarity into operational taxonomic units (OTUs). Principal coordinates analysis based on weighted-UniFrac distances did not reveal differences in bacterial communities among treatments in any of the sample sources. However, pairwise linear discriminant analysis indicated significant differences in relative abundance of some taxa (including CLas) among treatments. Network analysis showed that penicillin produced major changes in root bacterial community structure by affecting interspecific microbial associations. This study provides new knowledge of the effect of antimicrobial treatments on interspecific relationships in citrus microbial communities.

journal_name

Microb Ecol

journal_title

Microbial ecology

authors

Ascunce MS,Shin K,Huguet-Tapia JC,Poudel R,Garrett KA,van Bruggen AHC,Goss EM

doi

10.1007/s00248-018-1302-1

subject

Has Abstract

pub_date

2019-08-01 00:00:00

pages

457-469

issue

2

eissn

0095-3628

issn

1432-184X

pii

10.1007/s00248-018-1302-1

journal_volume

78

pub_type

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