Abstract
Heat shock treatment (HST) and UV-B irradiation can reduce pathogen infection in crops. However, information on the mechanism of UV-B action is limited. Here, we investigated the mechanism of UV-B-induced resistance against powdery mildew in cucumber and compared it to that of heat-shock-induced resistance. We measured the percentage of leaf area showing disease symptoms and examined the expression levels of defense- and heat-shock-related genes across treatment groups. UV-B irradiation (intensity, 5 µW/cm2) for 4 h/d followed by pathogen inoculation reduced the appearance of powdery mildew by 21.17% compared with the control group. Unlike HST—which induces systemic resistance—UV-B irradiation induced local resistance in cucumber, as indicated by local changes in gene expression (Chi2 and ETR2). UV-B-treated plants inoculated with powdery mildew showed higher expression levels of Chi2, ETR2, and LOX6 than plants that were either treated with UV-B or inoculated. UV-B had no major effects on systemic acquired resistance or heat shock transcription factors, which are known to be affected by HST. Combined HST and UV-B had a strong synergistic effect in reducing powdery mildew in cucumber. Our results indicate that UV-B treatment likely operates through a different mechanism than HST in triggering cucumber resistance against powdery mildew infection.
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Claims 6
Claim · model-written summary
UV-B irradiation for 4 h/d followed by inoculation reduced powdery mildew appearance on cucumber by 21.17% relative to the control group.
- Taxon
- cucumber
Cucumis sativuse0 - Treatment
- UV-B irradiation (intensity, 5 µW/cm2) for 4 h/de1
- Interactor
- powdery mildewe1pathogen
- Outcome
- appearance of powdery mildewe1
- Direction
- reducede1
- Value
- 21.17%e1
- Comparator
- control groupe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Here, we investigated the mechanism of UV-B-induced resistance against powdery mildew in cucumber”
e1“UV-B irradiation (intensity, 5 µW/cm2) for 4 h/d followed by pathogen inoculation reduced the appearance of powdery mildew by 21.17% compared with the control group”
Claim · model-written summary
UV-B irradiation induced local resistance in cucumber, indicated by local changes in expression of Chi2 and ETR2, unlike systemic resistance induced by heat shock treatment.
- Taxon
- cucumberCucumis sativuse2
- Treatment
- UV-B irradiatione2
- Gene
- Chi2 and ETR2e2
- Outcome
- local resistancee2
- Direction
- inducede2
- Comparator
- HSTe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Unlike HST—which induces systemic resistance—UV-B irradiation induced local resistance in cucumber, as indicated by local changes in gene expression (Chi2 and ETR2)”
Claim · model-written summary
UV-B-treated cucumber plants inoculated with powdery mildew had higher expression of Chi2, ETR2 and LOX6 than plants treated with UV-B or inoculated alone.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- UV-Be3
- Interactor
- powdery mildewe3pathogen
- Gene
- Chi2, ETR2, and LOX6e3
- Outcome
- expression levelse3
- Direction
- highere3
- Comparator
- plants that were either treated with UV-B or inoculatede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Here, we investigated the mechanism of UV-B-induced resistance against powdery mildew in cucumber”
e3“UV-B-treated plants inoculated with powdery mildew showed higher expression levels of Chi2, ETR2, and LOX6 than plants that were either treated with UV-B or inoculated”
Claim · model-written summary
UV-B had no major effect on systemic acquired resistance or heat shock transcription factors in cucumber.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- UV-Be4
- Outcome
- systemic acquired resistance or heat shock transcription factorse4
- Direction
- no major effectse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Here, we investigated the mechanism of UV-B-induced resistance against powdery mildew in cucumber”
e4“UV-B had no major effects on systemic acquired resistance or heat shock transcription factors”
Claim · model-written summary
Combined HST and UV-B had a strong synergistic effect in reducing powdery mildew on cucumber.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Combined HST and UV-Be5
- Interactor
- powdery mildewe5pathogen
- Outcome
- powdery mildewe5
- Direction
- reducinge5
- Qualifier
- strong synergistic effecte5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Here, we investigated the mechanism of UV-B-induced resistance against powdery mildew in cucumber”
e5“Combined HST and UV-B had a strong synergistic effect in reducing powdery mildew”
Claim · model-written summary
UV-B treatment likely operates through a different mechanism than HST in triggering cucumber resistance against powdery mildew.
- Taxon
- cucumberCucumis sativuse6
- Interactor
- powdery mildewe6pathogen
- Outcome
- resistance against powdery mildew infectione6
- Qualifier
- likely operates through a different mechanism than HSTe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“UV-B treatment likely operates through a different mechanism than HST in triggering cucumber resistance against powdery mildew infection”
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