Abstract
Abstract This study was carried out to gain more information concerning the mechanism by which bentazone reduces the herbicidal activity of sethoxydim. The possible roles of ATP and of the plasma membrane ATPase activity in the mechanism of antagonism were investigated. The first part of the study investigated the effect of exogenous ATP on the uptake of [ 14 C]sethoxydim by wheat leaf segments. Uptake increased with ATP concentration, the magnitude of the increase depending on the time of day when the incubations were started. In the second part of the study plasma membranes from wheat leaves were isolated using two immiscible polymers, polyethylene glygol and dextran, and the activities of their ATPases were measured by monitoring the amount of inorganic phosphate produced. ATPase activity was lower in the presence of 500 μM bentazone and the magnitude of the decrease increased with the concentration of bentazone. Bentazone derivatives that reduce the uptake of sethoxydim but have no effect on photosynthesis also reduced ATPase activity. A mechanism is proposed by which bentazone could alter the uptake of sethoxydim by decreasing the activity of plasma membrane ATPases.
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Claims 4
Claim · model-written summary
ATP increased sethoxydim uptake in wheat leaves with concentration, depending on incubation time.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- ATPe0
- Outcome
- Uptakee0
- Direction
- increasede0
- Qualifier
- time of day when the incubations were startede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Uptake increased with ATP concentration, the magnitude of the increase depending on the time of day when the incubations were started.”
t0“wheat leaf segments”
Claim · model-written summary
Bentazone lowered ATPase activity, with larger decreases at higher concentration.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 500 μM bentazonee0
- Outcome
- ATPase activitye0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ATPase activity was lower in the presence of 500 μM bentazone and the magnitude of the decrease increased with the concentration of bentazone.”
t0“wheat leaf segments”
Claim · model-written summary
Bentazone derivatives that reduce sethoxydim uptake also reduced ATPase activity without affecting photosynthesis.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Bentazone derivativese0
- Outcome
- ATPase activitye0
- Direction
- reducede0
- Qualifier
- have no effect on photosynthesise0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bentazone derivatives that reduce the uptake of sethoxydim but have no effect on photosynthesis also reduced ATPase activity.”
t0“wheat leaf segments”
Claim · model-written summary
The authors propose that bentazone reduces sethoxydim uptake by decreasing plasma membrane ATPase activity.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- bentazonee0
- Outcome
- uptake of sethoxydime0
- Qualifier
- decreasing the activity of plasma membrane ATPasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A mechanism is proposed by which bentazone could alter the uptake of sethoxydim by decreasing the activity of plasma membrane ATPases.”
t0“wheat leaf segments”