Abstract
Abstract BACKGROUND Citrus canker caused by Xanthomonas citri subsp. citri (Xcc) is a devastating bacterial disease that reduces citrus yield and quality, posing a serious threat to the citrus industry. Several conventional chemicals have been used to control citrus canker. However, this approach often leads to the excessive use of chemical agents, can exacerbate environmental pollution and promotes the development of resistant Xcc. Therefore, there is significant interest in the development of efficient and environmentally friendly technologies to control citrus canker. RESULTS In this study, water‐soluble ZnO quantum dots (ZnO QDs) were synthesised as an efficient nanopesticide against Xcc. The results showed that the antibacterial activity of ZnO QDs irradiated with visible light [half‐maximal effective concentration (EC 50 ) = 33.18 μg mL −1 ] was ~3.5 times higher than that of the dark‐treated group (EC 50 = 114.80 μg mL −1 ). ZnO QDs induced the generation of reactive oxygen species (•OH, •O − 2 and 1 O 2 ) under light irradiation, resulting in DNA damage, cytoplasmic destruction, and decreased catalase and superoxide dismutase activities. Transcription analysis showed downregulation of Xcc genes related to ‘biofilms, virulence, adhesion’ and ‘DNA transfer’ exposure to ZnO QDs. More importantly, ZnO QDs also promoted the growth of citrus. CONCLUSION This research provides new insights into the photocatalytic antibacterial mechanisms of ZnO QDs and supports the development of more efficient and safer ZnO QDs‐based nanopesticides to control citrus canker. © 2024 Society of Chemical Industry.
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Claims 5
Claim · model-written summary
Visible light raised ZnO QD antibacterial activity against Xcc about 3.5 fold relative to darkness.
- Treatment
- ZnO QDs irradiated with visible lighte0
- Outcome
- antibacterial activitye0
- Direction
- highere0
- Value
- ~3.5 timese0
- Qualifier
- EC 50 = 114.80 μg mL −1e0
- Comparator
- dark‐treated groupe0
CitrusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“antibacterial activity of ZnO QDs irradiated with visible light [half‐maximal effective concentration (EC 50 ) = 33.18 μg mL −1 ] was ~3.5 times higher than that of the dark‐treated group (EC 50 = 114.80 μg mL −1 )”
t0“citrus”
Claim · model-written summary
Irradiated ZnO QDs generated reactive oxygen species.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ZnO QDs induced the generation of reactive oxygen species (•OH, •O − 2 and 1 O 2 ) under light irradiation”
t0“citrus”
Claim · model-written summary
ZnO QDs damaged Xcc DNA and cytoplasm and lowered catalase and superoxide dismutase activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ZnO QDs induced the generation of reactive oxygen species (•OH, •O − 2 and 1 O 2 ) under light irradiation, resulting in DNA damage, cytoplasmic destruction, and decreased catalase and superoxide dismutase activities”
t0“citrus”
Claim · model-written summary
Xcc biofilm, virulence, adhesion and DNA transfer genes were downregulated after ZnO QD exposure.
- Treatment
- ZnO QDse0
- Outcome
- Xcc genes related to ‘biofilms, virulence, adhesion’ and ‘DNA transfer’e0
- Direction
- downregulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“downregulation of Xcc genes related to ‘biofilms, virulence, adhesion’ and ‘DNA transfer’ exposure to ZnO QDs”
t0“citrus”
Claim · model-written summary
ZnO QDs promoted citrus growth.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ZnO QDs also promoted the growth of citrus”
The same questions in other papers
zinc oxide · disease · CitrusResults agree
1 paper in the same direction as this paper
- positive
radiation · disease · CitrusPositive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
light · disease · CitrusPositive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
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.