Abstract
Abstract BACKGROUND Phytopathogen attacks threaten plant biodiversity and food production worldwide and are expected to worsen due to climate change. To reduce agricultural dependence on synthetic pesticides, eco‐friendly alternatives must be developed. We have recently shown that aqueous extracts from dried leaves of young Eucalyptus globulus Labill. had promising in vitro antibacterial activity against phytopathogens. However, its in vivo effectiveness remains unclear. Thus, this study aimed to evaluate the efficacy of the extract against tomato seeds and plants infected with Xanthomonas euvesicatoria (Jones et al. ) Constantin et al. ( Xeu ), as well as to assess the plant's physiological responses upon biopesticide application. For this, Solanum lycopersicum L. cv. Roma seeds were inoculated with a Xeu suspension, incubated with the extract (0, 15, and 30 g L −1 ), and left for germination for 10 days. RESULTS The treatment of inoculated seeds with the extract increased radicle length and reduced the incidence of symptomatic cotyledons. Parallely, 1‐month‐old tomato plants were foliar‐infected with a Xeu suspension and treated with various concentrations of the extract. Disease symptoms were monitored weekly over 3 weeks, showing a dose‐dependent decrease following extract application. After 21 days, the extract at both concentrations equally reduced the leaf bacterial population compared to infected plants. The application of the extract at 15 g L −1 to infected plants improved their physiological status by enhancing antioxidant enzyme activity and photosynthetic performance. CONCLUSION Overall, these findings suggest that the extract can be used as an effective tool against Xeu and contribute to reducing pesticide application. © 2025 Society of Chemical Industry.
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Claims 7
Claim · model-written summary
The extract increased radicle length in inoculated tomato seeds.
- Taxon
- tomato
Solanum lycopersicumt0 - Organ / stage
- seedse0
- Treatment
- the extracte0
- Outcome
- radicle lengthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment of inoculated seeds with the extract increased radicle length”
t0“tomato plants”
Claim · model-written summary
The extract reduced symptomatic cotyledons in inoculated tomato seeds.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- cotyledonse0
- Treatment
- the extracte0
- Outcome
- incidence of symptomatic cotyledonse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment of inoculated seeds with the extract increased radicle length and reduced the incidence of symptomatic cotyledons”
t0“tomato plants”
Claim · model-written summary
Increasing extract dose decreased disease symptoms in infected tomato plants.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- extract applicatione0
- Outcome
- Disease symptomse0
- Direction
- decreasee0
- Qualifier
- dose‐dependente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease symptoms were monitored weekly over 3 weeks, showing a dose‐dependent decrease following extract application”
t0“tomato plants”
Claim · model-written summary
Both extract concentrations reduced the leaf bacterial population after 21 days relative to infected plants.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- the extract at both concentrationse0
- Outcome
- leaf bacterial populatione0
- Direction
- reducede0
- Qualifier
- After 21 dayse0
- Comparator
- infected plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 21 days, the extract at both concentrations equally reduced the leaf bacterial population compared to infected plants”
t0“tomato plants”
Claim · model-written summary
Extract at 15 g L −1 enhanced antioxidant enzyme activity in infected tomato plants.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- extract at 15 g L −1e0
- Outcome
- antioxidant enzyme activitye0
- Direction
- enhancinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of the extract at 15 g L −1 to infected plants improved their physiological status by enhancing antioxidant enzyme activity and photosynthetic performance”
t0“tomato plants”
Claim · model-written summary
Extract at 15 g L −1 enhanced photosynthetic performance in infected tomato plants.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- extract at 15 g L −1e0
- Outcome
- photosynthetic performancee0
- Direction
- enhancinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of the extract at 15 g L −1 to infected plants improved their physiological status by enhancing antioxidant enzyme activity and photosynthetic performance”
t0“tomato plants”
Claim · model-written summary
The authors suggest the extract as a tool against Xeu to reduce pesticide application.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- the extracte0
- Interactor
- Xeue0pathogen
- Outcome
- reducing pesticide applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the extract can be used as an effective tool against Xeu and contribute to reducing pesticide application”
t0“tomato plants”
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