Abstract
Summary: The mechanism whereby Iinuron changes the functional and structural characteristics of chloroplast membranes was studied. The primary effect of the herbicide, the inhibition of phoiosynihetic electron transport results in an immuediatecessa‐tion of carbon dioxide fixation and alterations in the membrane energization. These are accompanied by secondary processes contributing to phytotoxicity. The fundamental action in its phytotoxicity, as shown in a model system of isolated chloro‐plasts, is the peroxidaiive breakdown of the polyunsaturated membrane lipids. This leads to destruction of the pigments, changes in the energy transfer, disorganization of the chloro‐plast membranes, and accumulation of toxic organic peroxides.
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Claims 5
Claim · model-written summary
Linuron inhibited photosynthetic electron transport.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The primary effect of the herbicide, the inhibition of phoiosynihetic electron transport”
t0“maize”
t1“maize”
Claim · model-written summary
Electron transport inhibition immediately stopped carbon dioxide fixation.
- Outcome
- carbon dioxide fixatione0
- Direction
- immuediatecessa‐tione0
- Qualifier
- immuediatecessa‐tion of carbon dioxide fixatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“results in an immuediatecessa‐tion of carbon dioxide fixation”
t0“maize”
t1“maize”
Claim · model-written summary
Linuron altered membrane energization.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alterations in the membrane energization.”
t0“linuron phytotoxicity in maize”
t1“linuron phytotoxicity in maize”
Claim · model-written summary
Peroxidative membrane lipid breakdown was identified as the fundamental phytotoxic action.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fundamental action in its phytotoxicity, as shown in a model system of isolated chloro‐plasts, is the peroxidaiive breakdown of the polyunsaturated membrane lipids.”
t0“maize”
t1“maize”
Claim · model-written summary
Lipid breakdown led to pigment destruction, changed energy transfer, membrane disorganization and toxic peroxide accumulation.
- Outcome
- destruction of the pigments, changes in the energy transfer, disorganization of the chloro‐plast membranes, and accumulation of toxic organic peroxidese0
- Qualifier
- This leads toe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This leads to destruction of the pigments, changes in the energy transfer, disorganization of the chloro‐plast membranes, and accumulation of toxic organic peroxides.”
t0“maize”
t1“maize”
The same questions in other papers
herbicide · physiology: photosynthesis · Zea mays (maize)Positive and negative results
9 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
7 papers more in this group
See all 11 papers →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.