Abstract
Abstract Zinc deficiency in rice ( Oryza sativa ) usually occurs after flooding. A greenhouse experiment was conducted to determine if the metabolic disorders associated with Zn deficiency in flooded rice are due to decreases in alcohol dehydrogenase (ADH) or glutamate dehydrogenase (GDH) activities, or both, in the roots, since Zn is a cofactor in these enzymes. ‘Saturn’ rice, a variety characterized as being susceptible to Zn deficiency, was grown in 20 pots containing 3 kg of Crowley silt loam soil (fine, montmorillonitic, thermic Typic Albaqualf). Half of the pots received 1 mg Zn/kg as ZnEDTA; the other half served as controls. Five days after flooding the control plants showed signs of Zn deficiency. The plants were harvested 17 d after flooding. Aboveground dry matter production by the fertilized plants ( x̄ =0.91 g) was significantly greater than that of the Zn‐deficient control plants ( x̄ =0.24 g). Plant tissue analysis revealed that Zn‐deficient plants accumulated divalent cations at the expense of monovalent cations, possibly indicating the increased production of a divalent charge‐specific carrier. Root GDH activities of the control and fertilized plants were not significantly different. However, ADH activities in the roots of plants that had received Zn were more than twice as high as those in control plants. Root ADH activity was also correlated with Zn concentration in the leaves ( r =0.78 ** ). It is hypothesized that decreases in the ADH activity of Zn‐deficient flooded rice result in less ATP production, thereby reducing vital metabolic activities of the roots.
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Claims 7
Claim · model-written summary
Zinc deficient plants showed deficiency signs five days after flooding.
- Taxon
- rice
Oryza sativae1 - Outcome
- signs of Zn deficiencye0
- Qualifier
- Five days after floodinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Five days after flooding the control plants showed signs of Zn deficiency”
e1“Zinc deficiency in rice ( Oryza sativa ) usually occurs after flooding”
Claim · model-written summary
Zinc fertilization increased aboveground dry matter from 0.24 to 0.91 g.
- Taxon
- riceOryza sativae1
- Treatment
- fertilized plantse0
- Outcome
- Aboveground dry matter productione0
- Direction
- greatere0
- Value
- 0.91 ge0
- Qualifier
- 0.24 ge0
- Comparator
- Zn‐deficient control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Aboveground dry matter production by the fertilized plants ( x̄ =0.91 g) was significantly greater than that of the Zn‐deficient control plants ( x̄ =0.24 g)”
e1“Zinc deficiency in rice ( Oryza sativa ) usually occurs after flooding”
Claim · model-written summary
Zinc deficient plants accumulated divalent cations at the expense of monovalent cations.
- Taxon
- riceOryza sativae1
- Outcome
- divalent cationse0
- Direction
- accumulatede0
- Comparator
- monovalent cationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn‐deficient plants accumulated divalent cations at the expense of monovalent cations”
e1“Zinc deficiency in rice ( Oryza sativa ) usually occurs after flooding”
Claim · model-written summary
Root GDH activity did not differ significantly between control and fertilized rice.
- Taxon
- riceOryza sativae1
- Treatment
- fertilized plantse0
- Gene
- GDHe0
- Outcome
- Root GDH activitiese0
- Direction
- not significantly differente0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root GDH activities of the control and fertilized plants were not significantly different”
e1“Zinc deficiency in rice ( Oryza sativa ) usually occurs after flooding”
Claim · model-written summary
Root ADH activity was more than twice as high with zinc fertilization.
- Taxon
- riceOryza sativae1
- Organ / stage
- rootse0
- Treatment
- received Zne0
- Gene
- ADHe0
- Outcome
- ADH activitiese0
- Direction
- more than twice as highe0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ADH activities in the roots of plants that had received Zn were more than twice as high as those in control plants”
e1“Zinc deficiency in rice ( Oryza sativa ) usually occurs after flooding”
Claim · model-written summary
Root ADH activity correlated with leaf zinc concentration.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root ADH activity was also correlated with Zn concentration in the leaves ( r =0.78 ** )”
e1“Zinc deficiency in rice ( Oryza sativa ) usually occurs after flooding”
Claim · model-written summary
The authors hypothesize that lower ADH activity under zinc deficiency reduces ATP production and root metabolism.
- Taxon
- riceOryza sativae1
- Gene
- ADHe0
- Outcome
- vital metabolic activities of the rootse0
- Qualifier
- less ATP productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is hypothesized that decreases in the ADH activity of Zn‐deficient flooded rice result in less ATP production, thereby reducing vital metabolic activities of the roots”
e1“Zinc deficiency in rice ( Oryza sativa ) usually occurs after flooding”
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