Abstract
Abstract Under Zn deficiency, the Cu/Zn-SOD protein content and activity are reduced in rice meristem and the Zn-deficient rice plant is prone to photo-oxidative stress. In the present study, the generation and effect of free radical in rice leaf were examined under Zn-deficient conditions. The SOD activity was depressed and the content of thiobarbituric acid-reactive substances, an index of lipid peroxidation, increased in the rice leaves grown under Zn-deficient conditions. The amplitude of the ESR signal increased in the Zn-deficient leaves. When the oxidative stress level increased by paraquat treatment, the bleaching of the pigment associated with the destruction of chlorophyll in leaves was observed in Zn-deficient leaves. The increase in the amplitude of the ESR signal and the bleaching of pigment by paraquat treatment occurred before any Zn deficiency symptoms appeared in the plants cultured without Zn. Among the Zn nutrition problems of rice plants, one predominant factor which causes Zn deficiency symptoms may be the failure of O2 - scavenging due to the shortage of Cu/ZnSOD. Therefore, when the oxidative stress level is likely to be high, the Zn level has to be sufficient in rice plants.
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Claims 9
Claim · model-written summary
Zn deficiency reduced Cu/Zn-SOD protein content and activity in rice meristem.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- meristeme0
- Treatment
- Zn deficiencye0
- Gene
- Cu/Zn-SODe0
- Outcome
- Cu/Zn-SOD protein content and activitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under Zn deficiency, the Cu/Zn-SOD protein content and activity are reduced in rice meristem and the Zn-deficient rice plant is prone to photo-oxidative stress”
Claim · model-written summary
Zn-deficient rice plants were prone to photo-oxidative stress.
- Taxon
- riceOryza sativae0
- Treatment
- Zn-deficiente0
- Outcome
- photo-oxidative stresse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under Zn deficiency, the Cu/Zn-SOD protein content and activity are reduced in rice meristem and the Zn-deficient rice plant is prone to photo-oxidative stress”
Claim · model-written summary
SOD activity was depressed in rice leaves grown under Zn-deficient conditions.
- Taxon
- riceOryza sativae1
- Organ / stage
- leavese1
- Treatment
- Zn-deficient conditionse1
- Outcome
- SOD activitye1
- Direction
- depressede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The SOD activity was depressed and the content of thiobarbituric acid-reactive substances, an index of lipid peroxidation, increased in the rice leaves grown under Zn-deficient conditions”
Claim · model-written summary
Thiobarbituric acid-reactive substances, an index of lipid peroxidation, increased in rice leaves grown under Zn-deficient conditions.
- Taxon
- riceOryza sativae1
- Organ / stage
- leavese1
- Treatment
- Zn-deficient conditionse1
- Outcome
- thiobarbituric acid-reactive substancese1
- Direction
- increasede1
- Qualifier
- an index of lipid peroxidatione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The SOD activity was depressed and the content of thiobarbituric acid-reactive substances, an index of lipid peroxidation, increased in the rice leaves grown under Zn-deficient conditions”
Claim · model-written summary
The amplitude of the ESR signal increased in Zn-deficient rice leaves.
- Taxon
- riceOryza sativat0
- Organ / stage
- leavese2
- Treatment
- Zn-deficiente2
- Outcome
- amplitude of the ESR signale2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Free radical injury in rice leaf under Zn deficiency”
e2“The amplitude of the ESR signal increased in the Zn-deficient leaves”
Claim · model-written summary
Paraquat treatment caused bleaching of pigment in Zn-deficient rice leaves.
- Taxon
- riceOryza sativat0
- Organ / stage
- leavese3
- Treatment
- paraquat treatmente3
- Outcome
- bleaching of the pigmente3
- Qualifier
- in Zn-deficient leavese3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Free radical injury in rice leaf under Zn deficiency”
e3“When the oxidative stress level increased by paraquat treatment, the bleaching of the pigment associated with the destruction of chlorophyll in leaves was observed in Zn-deficient leaves”
Claim · model-written summary
The ESR signal increase and pigment bleaching in rice occurred before Zn deficiency symptoms appeared.
- Taxon
- riceOryza sativat0
- Outcome
- the increase in the amplitude of the ESR signal and the bleaching of pigmente4
- Qualifier
- occurred before any Zn deficiency symptoms appearede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Free radical injury in rice leaf under Zn deficiency”
e4“The increase in the amplitude of the ESR signal and the bleaching of pigment by paraquat treatment occurred before any Zn deficiency symptoms appeared in the plants cultured without Zn”
Claim · model-written summary
Failure of O2 - scavenging due to shortage of Cu/ZnSOD may be the predominant factor causing Zn deficiency symptoms in rice.
- Taxon
- rice plantsOryza sativae5
- Gene
- Cu/ZnSODe5
- Outcome
- Zn deficiency symptomse5
- Qualifier
- failure of O2 - scavenginge5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Among the Zn nutrition problems of rice plants, one predominant factor which causes Zn deficiency symptoms may be the failure of O2 - scavenging due to the shortage of Cu/ZnSOD”
Claim · model-written summary
The authors recommend that Zn level in rice plants be sufficient when oxidative stress is likely to be high.
- Taxon
- rice plantsOryza sativae6
- Outcome
- the Zn level has to be sufficiente6
- Qualifier
- when the oxidative stress level is likely to be highe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Therefore, when the oxidative stress level is likely to be high, the Zn level has to be sufficient in rice plants”
The same questions in other papers
paraquat · physiology: pigments · Oryza sativa (rice)Positive and negative results
1 in the opposite direction
- positive
zinc atom · quality: protein · Oryza sativa (rice)Positive and negative results
29 papers in the same direction as this paper · 3 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- negative
- negative
29 papers more in this group
See all 33 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.