Abstract
Rice ( Oryza sativa L.) seeds were soaked for 18 h in distilled water in the absence (–PBZ) or presence (+PBZ, a triazole) of 100 mg l −1 paclobutrazol and then air dried. These air‐dried seeds were germinated in the dark and then cultivated in a Phytotron. Twelve‐day‐old –PBZ and +PBZ seedlings were treated or not with CdCl 2 . Cd toxicity was judged by the decrease in biomass production, decrease in chlorophyll and protein content, increase in NH 4 + content and induction of oxidative stress. The results indicated that PBZ applied to seeds was able to protect rice seedlings from Cd toxicity. On treatment with CdCl 2 , the abscisic acid (ABA) content increased in +PBZ leaves, but not in –PBZ leaves. The decrease in the transpiration rate of –PBZ seedlings by CdCl 2 was less than that of +PBZ seedlings. Exogenous application of the ABA biosynthesis inhibitor, fluridone (Flu), reduced ABA accumulation, increased the transpiration rate and Cd content, and decreased the Cd tolerance of +PBZ seedlings. The effects of Flu on the Cd toxicity, transpiration rate and Cd content were reversed by the application of ABA. It seems that the PBZ‐induced Cd tolerance of rice seedlings is mediated through an accumulation of ABA.
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Claims 9
Claim · model-written summary
Seed paclobutrazol protected rice seedlings from cadmium toxicity.
- Taxon
- rice seedlings
Oryza sativae0 - Treatment
- PBZ applied to seedse0
- Outcome
- Cd toxicitye0
- Direction
- protecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PBZ applied to seeds was able to protect rice seedlings from Cd toxicity”
Claim · model-written summary
Cadmium treatment increased ABA content in PBZ leaves but not untreated leaves.
- Taxon
- riceOryza sativat0
- Organ / stage
- leavese0
- Treatment
- CdCl 2e0
- Outcome
- abscisic acid (ABA) contente0
- Direction
- increasede0
- Comparator
- –PBZ leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On treatment with CdCl 2 , the abscisic acid (ABA) content increased in +PBZ leaves, but not in –PBZ leaves”
t0“rice seedlings”
Claim · model-written summary
Cadmium decreased transpiration less in untreated than PBZ seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- CdCl 2e0
- Outcome
- transpiration ratee0
- Direction
- decreasee0
- Comparator
- +PBZ seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decrease in the transpiration rate of –PBZ seedlings by CdCl 2 was less than that of +PBZ seedlings”
t0“rice seedlings”
Claim · model-written summary
Fluridone reduced ABA accumulation in PBZ seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- fluridone (Flu)e0
- Outcome
- ABA accumulatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fluridone (Flu), reduced ABA accumulation”
t0“rice seedlings”
Claim · model-written summary
Fluridone increased transpiration rate in PBZ seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- fluridone (Flu)e0
- Outcome
- transpiration ratee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fluridone (Flu), reduced ABA accumulation, increased the transpiration rate and Cd content”
t0“rice seedlings”
Claim · model-written summary
Fluridone increased Cd content in PBZ seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- fluridone (Flu)e0
- Outcome
- Cd contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fluridone (Flu), reduced ABA accumulation, increased the transpiration rate and Cd content”
t0“rice seedlings”
Claim · model-written summary
Fluridone decreased cadmium tolerance in PBZ seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- fluridone (Flu)e0
- Outcome
- Cd tolerancee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fluridone (Flu), reduced ABA accumulation, increased the transpiration rate and Cd content, and decreased the Cd tolerance of +PBZ seedlings”
t0“rice seedlings”
Claim · model-written summary
ABA reversed the fluridone effects on cadmium toxicity, transpiration and cadmium content.
- Taxon
- riceOryza sativat0
- Treatment
- application of ABAe0
- Outcome
- Cd toxicity, transpiration rate and Cd contente0
- Direction
- reversede0
- Comparator
- Flue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of Flu on the Cd toxicity, transpiration rate and Cd content were reversed by the application of ABA”
t0“rice seedlings”
Claim · model-written summary
The authors inferred that ABA accumulation mediates PBZ-induced Cd tolerance.
- Taxon
- rice seedlingsOryza sativae0
- Compound
- ABAe0
- Outcome
- Cd tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PBZ‐induced Cd tolerance of rice seedlings is mediated through an accumulation of ABA”
The same questions in other papers
paclobutrazol · pest · Oryza sativa (rice)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.