Abstract
The uptake of the auxin type herbicide 2,4‐D into rice seedlings ( Oryza sativa L. cv. Dunghan Shali) and its effects on the K + , NH + 4 and NO 3 ion uptake and the K + content were investigated at different pH values. A short incubation of the roots in 0.01 m M 2,4‐D caused a marked ion uptake inhibition only at low pH. The non‐auxin type herbicide benthiocarb did not produce such an inhibitory effect. Lowering of the pH in the external medium led to an increased 2,4‐D uptake by the roots. These results can be explained by the increased H + permeability of the membranes, allowing a more rapid entrance of 2,4‐D into the root cells, thereby inhibiting the active ion uptake. Rice roots not subjected to 2,4‐D treatment responded to H + stress with an increased anomalous K + uptake and a decreased K + content. With reference to the effects of pH changes on the ion and 2,4‐D uptake, possible transport mechanism of NH + 4 and 2,4‐D are briefly discussed.
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Claims 6
Claim · model-written summary
A short incubation in 0.01 mM 2,4-D markedly decreased ion uptake by rice roots only at low pH.
- Taxon
- Oryza sativa L.
Oryza sativae0 - Material
- Dunghan Shalie0
- Organ / stage
- rootse1
- Treatment
- 0.01 m M 2,4‐De1
- Outcome
- ion uptakee1
- Direction
- decreaseinferrede1
- Value
- 0.01 m Me1
- Qualifier
- only at low pHe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L. cv. Dunghan Shali”
e1“A short incubation of the roots in 0.01 m M 2,4‐D caused a marked ion uptake inhibition only at low pH”
Claim · model-written summary
The non-auxin herbicide benthiocarb did not produce the inhibitory effect on ion uptake.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- Dunghan Shalie0
- Treatment
- benthiocarbe2
- Outcome
- inhibitory effecte2
- Direction
- did not producee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L. cv. Dunghan Shali”
e2“The non‐auxin type herbicide benthiocarb did not produce such an inhibitory effect”
Claim · model-written summary
Lowering the external pH increased 2,4-D uptake by rice roots.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- Dunghan Shalie0
- Organ / stage
- rootse3
- Treatment
- Lowering of the pH in the external mediume3
- Outcome
- 2,4‐D uptakee3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L. cv. Dunghan Shali”
e3“Lowering of the pH in the external medium led to an increased 2,4‐D uptake by the roots”
Claim · model-written summary
Rice roots not treated with 2,4-D increased anomalous K+ uptake under H+ stress.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- Dunghan Shalie0
- Organ / stage
- Rice rootse4
- Treatment
- H+ stresse4
- Outcome
- anomalous K+ uptakee4
- Direction
- increasede4
- Comparator
- not subjected to 2,4‐D treatmente4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L. cv. Dunghan Shali”
e4“Rice roots not subjected to 2,4‐D treatment responded to H+ stress with an increased anomalous K+ uptake and a decreased K+ content”
Claim · model-written summary
Rice roots not treated with 2,4-D decreased K+ content under H+ stress.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- Dunghan Shalie0
- Organ / stage
- Rice rootse4
- Treatment
- H+ stresse4
- Outcome
- K+ contente4
- Direction
- decreasede4
- Comparator
- not subjected to 2,4‐D treatmente4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L. cv. Dunghan Shali”
e4“Rice roots not subjected to 2,4‐D treatment responded to H+ stress with an increased anomalous K+ uptake and a decreased K+ content”
Claim · model-written summary
Increased H+ permeability of root membranes may explain faster 2,4-D entry and inhibition of active ion uptake.
- Taxon
- Oryza sativa L.Oryza sativae0
- Outcome
- active ion uptakee5
- Qualifier
- increased H+ permeability of the membranese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L. cv. Dunghan Shali”
e5“These results can be explained by the increased H+ permeability of the membranes, allowing a more rapid entrance of 2,4‐D into the root cells, thereby inhibiting the active ion uptake”
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See all 12 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.