Abstract
Helminthosporium maydis pathotoxin caused a rapid inhibition of photosynthesis in whole leaves of maize having Texas male-sterile cytoplasm but not in leaves having normal cytoplasm. Electron transport, phosphorylation, and proton uptake activities of isolated chloroplast lamellae, from either normal or Texas male-sterile cytoplasm leaves, were unaffected by addition of toxin to the reaction mixture. The toxin was found to have a direct effect on stomatal functioning. Rates of transpiration were inhibited in treated leaves at times slightly preceding the observed effects on photosynthesis. In studies with isolated epidermal peels from Texas male-sterile cytoplasm maize leaves, the toxin inhibited light-induced K(+) uptake by guard cells. All effects of the toxin on Texas male-sterile cytoplasm maize tissues were found to be similar to the mode of action of abscisic acid.
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Claims 7
Claim · model-written summary
Pathotoxin rapidly inhibited photosynthesis in maize leaves with Texas male-sterile cytoplasm.
- Material
- Texas male-sterile cytoplasme0
- Organ / stage
- whole leavese0
- Treatment
- Helminthosporium maydis pathotoxine0
- Interactor
- Helminthosporium maydis
Bipolaris maydise0pathogen - Outcome
- photosynthesise0
- Direction
- inhibitione0
- Comparator
- leaves having normal cytoplasme0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Helminthosporium maydis pathotoxin caused a rapid inhibition of photosynthesis in whole leaves of maize having Texas male-sterile cytoplasm but not in leaves having normal cytoplasm”
Claim · model-written summary
Photosynthesis in normal-cytoplasm maize leaves was not inhibited by pathotoxin.
- Material
- normal cytoplasme0
- Treatment
- Helminthosporium maydis pathotoxine0
- Interactor
- Helminthosporium maydisBipolaris maydise0pathogen
- Outcome
- photosynthesise0
- Comparator
- Texas male-sterile cytoplasme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Helminthosporium maydis pathotoxin caused a rapid inhibition of photosynthesis in whole leaves of maize having Texas male-sterile cytoplasm but not in leaves having normal cytoplasm”
Claim · model-written summary
Toxin did not affect electron transport, phosphorylation or proton uptake of isolated chloroplast lamellae.
- Organ / stage
- isolated chloroplast lamellaee0
- Treatment
- addition of toxine0
- Outcome
- Electron transport, phosphorylation, and proton uptake activitiese0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Electron transport, phosphorylation, and proton uptake activities of isolated chloroplast lamellae, from either normal or Texas male-sterile cytoplasm leaves, were unaffected by addition of toxin to the reaction mixture”
t0“whole leaves of maize having Texas male-sterile cytoplasm”
Claim · model-written summary
The toxin directly affected stomatal functioning.
- Outcome
- direct effect on stomatal functioninge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The toxin was found to have a direct effect on stomatal functioning”
t0“whole leaves of maize having Texas male-sterile cytoplasm”
Claim · model-written summary
Toxin inhibited transpiration before photosynthetic effects appeared.
- Treatment
- treated leavese0
- Outcome
- Rates of transpiratione0
- Direction
- inhibitede0
- Qualifier
- at times slightly preceding the observed effects on photosynthesise0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rates of transpiration were inhibited in treated leaves at times slightly preceding the observed effects on photosynthesis”
t0“whole leaves of maize having Texas male-sterile cytoplasm”
Claim · model-written summary
Toxin inhibited light-induced potassium uptake by guard cells in Texas male-sterile maize.
- Material
- Texas male-sterile cytoplasme0
- Organ / stage
- guard cellse0
- Treatment
- the toxine0
- Outcome
- light-induced K(+) uptakee0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In studies with isolated epidermal peels from Texas male-sterile cytoplasm maize leaves, the toxin inhibited light-induced K(+) uptake by guard cells”
Claim · model-written summary
Toxin effects on Texas male-sterile maize resembled the mode of action of abscisic acid.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All effects of the toxin on Texas male-sterile cytoplasm maize tissues were found to be similar to the mode of action of abscisic acid”
The same questions in other papers
pathogen product · nutrient: content · Zea mays (maize)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
2 papers more in this group
See all 6 papers →pathogen product · molecular: expression · Zea mays (maize)Results agree
2 papers in the same direction as this paper
- negative
- no effect
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.