Abstract
Cercosporin, a photoactivated polyketide toxin produced by fungi of the genus Cercospora , reacts with molecular oxygen to produce oxygen radicals. Using both minus‐and plus‐cercosporin fungal extracts and purified cercosporin, we have analyzed antioxdant defense gene responses in maize scutella at two stages in development. The three maize catalases (CATH 2 O 2 : H 2 O 2 oxidoreductase, EC 1.11.1.6) respond differentially to applied cercosporin, and this response varies with developmental stage. Total catalase activity, as well as individual isozyme proteins and their corresponding steady‐state levels of RNA changed in parallel in response to applied cercosporin. In contrast, both toal superoxide dismutase (SOD, O 2 :O 2 oxidoreductase; EC 1.15.1.1) activity and individual isozyme protein levels remained constant in all treatments. Sod transcript accumulation, however, changed dramatically. Comparison of the response of these genes to minus‐ and plus‐cercosporin fungal extracts with their response to purified cercosporin demonstrated that other fungal compounds influence the expression of both Sod and Cat .
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Claims 5
Claim · model-written summary
Maize catalases responded differently to applied cercosporin depending on developmental stage.
Zea maysNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The three maize catalases (CATH 2 O 2 : H 2 O 2 oxidoreductase, EC 1.11.1.6) respond differentially to applied cercosporin, and this response varies with developmental stage.”
Claim · model-written summary
Total catalase activity, isozyme proteins and corresponding RNA levels changed in parallel after cercosporin application.
- Treatment
- applied cercosporine0
- Gene
- catalasee0
- Outcome
- Total catalase activity, as well as individual isozyme proteins and their corresponding steady‐state levels of RNAe0
- Direction
- changede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“Total catalase activity, as well as individual isozyme proteins and their corresponding steady‐state levels of RNA changed in parallel in response to applied cercosporin.”
Claim · model-written summary
Superoxide dismutase activity and individual isozyme protein levels remained constant across treatments.
- Treatment
- all treatmentse0
- Gene
- superoxide dismutasee0
- Outcome
- superoxide dismutase (SOD, O 2 :O 2 oxidoreductase; EC 1.15.1.1) activity and individual isozyme protein levelse0
- Direction
- remained constante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“both toal superoxide dismutase (SOD, O 2 :O 2 oxidoreductase; EC 1.15.1.1) activity and individual isozyme protein levels remained constant in all treatments.”
Claim · model-written summary
Sod transcript accumulation changed dramatically.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“Sod transcript accumulation, however, changed dramatically.”
Claim · model-written summary
Other fungal compounds influenced Sod and Cat expression beyond purified cercosporin responses.
- Gene
- Sod and Cate0
- Compound
- other fungal compoundse0
- Outcome
- expression of both Sod and Cate0
- Comparator
- purified cercosporine0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“Comparison of the response of these genes to minus‐ and plus‐cercosporin fungal extracts with their response to purified cercosporin demonstrated that other fungal compounds influence the expression of both Sod and Cat .”