Abstract
Abstract The hypothesis that Zn deficiency enhances the accumulation of B in barley ( Hordeum vulgare L.) was tested in plants grown in nutrient solutions containing varying concentrations of B. Mean daily B uptake rates in 3‐week‐old seedlings supplied no Zn (−Zn treatment) were from 2 to 2.5 times higher as in plants supplied 2 µ M Zn (+ Zn treatment). These effects were observed after only 7 d growth without added Zn. During this time, Zn in grain reserves and contaminant‐Zn were still adequate to maintain all plants with an internal tissue Zn concentration well above the critical tissue concentration (about 15 mg kg −1 Zn on a dry weight basis), and no yield response to Zn supplementation occurred. The effects of Zn on B uptake, therefore, support the concept that Zn performs a protective role at the external surfaces of, or in, root‐cell membranes. When the concentration of B in the nutrient solution was extremely high (e.g., 3000 µ M ), this protective effect of Zn disappeared and plants in all treatments developed B toxicity symptoms and accumulated high B concentrations. Other nutrients were also accumulated under Zn deprivation—namely, P, NO 3 , S, Ca, Mg, K, and Cu, but not Fe. Higher concentrations of P in the nutrient solution resulted in higher uptake rates of all ions, especially in the ‐Zn plants. A similar but smaller effect of added P on ion uptake occurred in +Zn plants.
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Claims 13
Claim · model-written summary
Barley seedlings without added Zn had B uptake rates 2 to 2.5 times those supplied Zn.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Organ / stage
- 3‐week‐old seedlingse0
- Treatment
- supplied no Zn (−Zn treatment)e0
- Outcome
- B uptake ratese0
- Direction
- highere0
- Value
- 2 to 2.5 timese0
- Comparator
- plants supplied 2 µ M Zn (+ Zn treatment)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“B uptake rates in 3‐week‐old seedlings supplied no Zn (−Zn treatment) were from 2 to 2.5 times higher as in plants supplied 2 µ M Zn (+ Zn treatment)”
e1“barley ( Hordeum vulgare L.)”
Claim · model-written summary
The Zn deprivation effect on B uptake appeared after 7 days.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- without added Zne0
- Outcome
- These effectse0
- Value
- 7 de0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These effects were observed after only 7 d growth without added Zn”
e1“barley ( Hordeum vulgare L.)”
Claim · model-written summary
Zn supplementation caused no yield response during this interval.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- Zn supplementatione0
- Outcome
- yield responsee0
- Direction
- noe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no yield response to Zn supplementation occurred”
e1“barley ( Hordeum vulgare L.)”
Claim · model-written summary
The authors infer that Zn protects root-cell membrane surfaces or interiors.
- Taxon
- barleyHordeum vulgaree1
- Organ / stage
- root‐cell membranese0
- Compound
- Zne0
- Outcome
- protective rolee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn performs a protective role at the external surfaces of, or in, root‐cell membranes”
e1“barley ( Hordeum vulgare L.)”
Claim · model-written summary
At extremely high nutrient-solution B, Zn protection disappeared.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- concentration of B in the nutrient solution was extremely highe0
- Outcome
- protective effect of Zne0
- Direction
- disappearede0
- Value
- 3000 µ Me0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the concentration of B in the nutrient solution was extremely high (e.g., 3000 µ M ), this protective effect of Zn disappeared”
e1“barley ( Hordeum vulgare L.)”
Claim · model-written summary
All treatments developed B toxicity symptoms at extremely high B.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- B toxicity symptomse0
- Qualifier
- all treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants in all treatments developed B toxicity symptoms and accumulated high B concentrations”
e1“barley ( Hordeum vulgare L.)”
Claim · model-written summary
All treatments accumulated high B concentrations at extremely high B.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- B concentrationse0
- Direction
- highe0
- Qualifier
- all treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants in all treatments developed B toxicity symptoms and accumulated high B concentrations”
e1“barley ( Hordeum vulgare L.)”
Claim · model-written summary
Zn deprivation increased accumulation of P, NO 3 and S.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- Zn deprivatione0
- Outcome
- P, NO 3 , Se0
- Direction
- accumulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Other nutrients were also accumulated under Zn deprivation—namely, P, NO 3 , S, Ca, Mg, K, and Cu, but not Fe”
e1“barley ( Hordeum vulgare L.)”
Claim · model-written summary
Zn deprivation increased accumulation of Ca, Mg and K.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- Zn deprivatione0
- Outcome
- Ca, Mg, Ke0
- Direction
- accumulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Other nutrients were also accumulated under Zn deprivation—namely, P, NO 3 , S, Ca, Mg, K, and Cu, but not Fe”
e1“barley ( Hordeum vulgare L.)”
Claim · model-written summary
Zn deprivation increased Cu accumulation.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- Zn deprivatione0
- Outcome
- Cue0
- Direction
- accumulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Other nutrients were also accumulated under Zn deprivation—namely, P, NO 3 , S, Ca, Mg, K, and Cu, but not Fe”
e1“barley ( Hordeum vulgare L.)”
Claim · model-written summary
Fe was not accumulated under Zn deprivation.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- Zn deprivatione0
- Outcome
- Fee0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Other nutrients were also accumulated under Zn deprivation—namely, P, NO 3 , S, Ca, Mg, K, and Cu, but not Fe”
e1“barley ( Hordeum vulgare L.)”
Claim · model-written summary
Higher solution P increased uptake rates of all ions, especially without Zn.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- Higher concentrations of P in the nutrient solutione0
- Outcome
- uptake rates of all ionse0
- Direction
- highere0
- Qualifier
- especially in the ‐Zn plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher concentrations of P in the nutrient solution resulted in higher uptake rates of all ions, especially in the ‐Zn plants”
e1“barley ( Hordeum vulgare L.)”
Claim · model-written summary
Added P increased ion uptake in Zn-supplied plants, but less strongly.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- added Pe0
- Outcome
- ion uptakee0
- Direction
- smallere0
- Qualifier
- +Zn plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A similar but smaller effect of added P on ion uptake occurred in +Zn plants”
e1“barley ( Hordeum vulgare L.)”
The same questions in other papers
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10 papers in the same direction as this paper · 25 in the opposite direction
- positive
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See all 36 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.