Abstract
Plant extracts can have powerful antibacterial activity and may be used as biological control against important plant pathogens. This study assessed effect of extracts of Cymbopogon citratus, Eucalyptus camaldulensis and Mentha piperita against two pathovars of Xanthomonas oryzae attacking rice. Both in vitro and in vivo approaches were used for different strains of X. oryzae originating from Burkina Faso. The three essential oils (EOs) have antibacterial activity in vitro test (agar diffusion method), but, EO from C. citratus at 1:5 dilution (v/v) resulted in the highest inhibition (over 30 mm of inhibition zone) against X. oryzae pv. oryzae and X. oryzae pv. oryzicola. However, they reduced significantly rice seed germination and induced herbicide effects on rice leaves. On the other hand, aqueous extracts from C. citratus stimulated bacterial growth, while extracts from E. camaldulensis had an inhibitory effect (28 mm of inhibition zone at 3:10 dilution, w/v). Therefore, the characterization of active compounds will determine one or more compound(s) involved in the antibacterial activity. Key words: Xanthomonas oryzae, rice, plant extracts, antibacterial activity.
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Claims 7
Claim · model-written summary
All three essential oils had in vitro antibacterial activity.
- Taxon
- rice
Oryza sativat0 - Interactor
- Xanthomonas oryzaeXanthomonas oryzaee3pathogen
- Outcome
- antibacterial activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The three essential oils (EOs) have antibacterial activity in vitro test (agar diffusion method)”
t0“rice”
e1“The three essential oils (EOs) have antibacterial activity in vitro test (agar diffusion method)”
e2“X. oryzae originating from Burkina Faso”
e3“Xanthomonas oryzae attacking rice”
Claim · model-written summary
C. citratus essential oil at 1:5 dilution gave the highest inhibition of X. oryzae pv. oryzae, above 30 mm.
- Taxon
- riceOryza sativat0
- Treatment
- EO from C. citratus at 1:5 dilution (v/v)e0
- Interactor
- X. oryzae pv. oryzae
Xanthomonas oryzae pv. oryzaee0pathogen - Outcome
- inhibitione0
- Direction
- higheste0
- Value
- over 30 mme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EO from C. citratus at 1:5 dilution (v/v) resulted in the highest inhibition (over 30 mm of inhibition zone) against X. oryzae pv. oryzae and X. oryzae pv. oryzicola”
t0“rice”
e1“The three essential oils (EOs) have antibacterial activity in vitro test (agar diffusion method)”
e2“X. oryzae originating from Burkina Faso”
e3“Xanthomonas oryzae attacking rice”
Claim · model-written summary
C. citratus essential oil at 1:5 dilution gave the highest inhibition of X. oryzae pv. oryzicola, above 30 mm.
- Taxon
- riceOryza sativat0
- Treatment
- EO from C. citratus at 1:5 dilution (v/v)e0
- Interactor
- X. oryzae pv. oryzicolaXanthomonas oryzae pv. oryzicolae0pathogen
- Outcome
- inhibitione0
- Direction
- higheste0
- Value
- over 30 mme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EO from C. citratus at 1:5 dilution (v/v) resulted in the highest inhibition (over 30 mm of inhibition zone) against X. oryzae pv. oryzae and X. oryzae pv. oryzicola”
t0“rice”
e1“The three essential oils (EOs) have antibacterial activity in vitro test (agar diffusion method)”
e2“X. oryzae originating from Burkina Faso”
e3“Xanthomonas oryzae attacking rice”
Claim · model-written summary
The essential oils significantly reduced rice seed germination.
- Taxon
- riceOryza sativat0
- Treatment
- essential oilse1
- Outcome
- rice seed germinatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they reduced significantly rice seed germination”
t0“rice”
e1“The three essential oils (EOs) have antibacterial activity in vitro test (agar diffusion method)”
e2“X. oryzae originating from Burkina Faso”
e3“Xanthomonas oryzae attacking rice”
Claim · model-written summary
The essential oils induced herbicide effects on rice leaves.
- Taxon
- riceOryza sativat0
- Treatment
- essential oilse1
- Outcome
- herbicide effects on rice leavese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they reduced significantly rice seed germination and induced herbicide effects on rice leaves”
t0“rice”
e1“The three essential oils (EOs) have antibacterial activity in vitro test (agar diffusion method)”
e2“X. oryzae originating from Burkina Faso”
e3“Xanthomonas oryzae attacking rice”
Claim · model-written summary
Aqueous C. citratus extracts stimulated bacterial growth.
- Taxon
- riceOryza sativat0
- Treatment
- aqueous extracts from C. citratuse0
- Interactor
- X. oryzaeXanthomonas oryzaee2pathogen
- Outcome
- bacterial growthe0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“aqueous extracts from C. citratus stimulated bacterial growth”
t0“rice”
e1“The three essential oils (EOs) have antibacterial activity in vitro test (agar diffusion method)”
e2“X. oryzae originating from Burkina Faso”
e3“Xanthomonas oryzae attacking rice”
Claim · model-written summary
E. camaldulensis aqueous extracts inhibited bacterial growth with a 28 mm inhibition zone at 3:10 dilution.
- Taxon
- riceOryza sativat0
- Treatment
- extracts from E. camaldulensise0
- Interactor
- X. oryzaeXanthomonas oryzaee2pathogen
- Outcome
- inhibition zonee0
- Direction
- inhibitorye0
- Value
- 28 mme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“extracts from E. camaldulensis had an inhibitory effect (28 mm of inhibition zone at 3:10 dilution, w/v)”
t0“rice”
e1“The three essential oils (EOs) have antibacterial activity in vitro test (agar diffusion method)”
e2“X. oryzae originating from Burkina Faso”
e3“Xanthomonas oryzae attacking rice”
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.