Abstract
Abstract In some previous experiments, Zn deficiency has enhanced P accumulation in old leaves to toxic concentrations by enhancing the rate of P absorption. This research was undertaken to examine the relationship of Zn deficiency to P accumulation and toxicity in young wheat plants ( Triticum aestivum L. ‘Gamenya’) grown in a complete nutrient solution with 1000 µ M phosphate and either with or without 2.5 µ M Zn. Mild Zn deficiency depressed shoot but enhanced root DM and this change was almost paralleled by P distribution. Severe Zn deficiency enhanced P concentration to 3 to 4% in old leaves and the marked necrotic symptoms were attributed to combined Zn deficiency and P toxicity. It depressed whole plant dry matter (DM) by 40% but P content by only 10%. It severely depressed DM distribution but enhanced P distribution to shoots thus doubling shoot P concentration. Short term and long term estimates indicate that mild Zn deficiency had only a transient effect in enhancing Pi absorption rate as severe Zn deficiency substantially depressed it. Thus, Zn deficiency enhanced P concentrations to toxic levels in old leaves through the cumulative effects of responses at three tiers of structural organization: (i) in the whole plant, it depressed DM more strongly than P content, (ii) between roots and shoots, it depressed that proportion of total DM which was present in shoots while increasing that of total P, (iii) within shoots, it concentrated P in old leaves by depressing new growth.
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Claims 12
Claim · model-written summary
Mild zinc deficiency depressed shoot dry matter.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- Mild Zn deficiencye0
- Outcome
- shoote0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mild Zn deficiency depressed shoot but enhanced root DM”
e1“young wheat plants ( Triticum aestivum L. ‘Gamenya’)”
Claim · model-written summary
Mild zinc deficiency enhanced root dry matter.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Mild Zn deficiencye0
- Outcome
- root DMe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mild Zn deficiency depressed shoot but enhanced root DM”
e1“young wheat plants ( Triticum aestivum L. ‘Gamenya’)”
Claim · model-written summary
Severe zinc deficiency raised phosphorus concentration in old leaves to 3 to 4%.
- Taxon
- wheatTriticum aestivume1
- Organ / stage
- old leavese0
- Treatment
- Severe Zn deficiencye0
- Outcome
- P concentratione0
- Direction
- enhancede0
- Value
- 3 to 4%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe Zn deficiency enhanced P concentration to 3 to 4% in old leaves”
e1“young wheat plants ( Triticum aestivum L. ‘Gamenya’)”
Claim · model-written summary
Old leaves displayed marked necrotic symptoms attributed to combined zinc deficiency and phosphorus toxicity.
- Taxon
- wheatTriticum aestivume1
- Treatment
- combined Zn deficiency and P toxicitye0
- Outcome
- marked necrotic symptomse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“marked necrotic symptoms were attributed to combined Zn deficiency and P toxicity”
e1“young wheat plants ( Triticum aestivum L. ‘Gamenya’)”
Claim · model-written summary
Severe zinc deficiency depressed whole-plant dry matter by 40%.
- Taxon
- wheatTriticum aestivume2
- Treatment
- Severe Zn deficiencye1
- Outcome
- whole plant dry matter (DM)e0
- Direction
- depressede0
- Value
- 40%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It depressed whole plant dry matter (DM) by 40% but P content by only 10%”
e1“Severe Zn deficiency enhanced P concentration to 3 to 4% in old leaves”
e2“young wheat plants ( Triticum aestivum L. ‘Gamenya’)”
Claim · model-written summary
Severe zinc deficiency depressed phosphorus content by 10%.
- Taxon
- wheatTriticum aestivume2
- Treatment
- Severe Zn deficiencye1
- Outcome
- P contente0
- Direction
- depressede0
- Value
- 10%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It depressed whole plant dry matter (DM) by 40% but P content by only 10%”
e1“Severe Zn deficiency enhanced P concentration to 3 to 4% in old leaves”
e2“young wheat plants ( Triticum aestivum L. ‘Gamenya’)”
Claim · model-written summary
Severe deficiency depressed dry-matter distribution to shoots.
- Taxon
- wheatTriticum aestivume2
- Treatment
- Severe Zn deficiencye1
- Outcome
- DM distributione0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It severely depressed DM distribution but enhanced P distribution to shoots thus doubling shoot P concentration”
e1“Severe Zn deficiency enhanced P concentration to 3 to 4% in old leaves”
e2“young wheat plants ( Triticum aestivum L. ‘Gamenya’)”
Claim · model-written summary
Severe deficiency enhanced phosphorus distribution to shoots.
- Taxon
- wheatTriticum aestivume2
- Treatment
- Severe Zn deficiencye1
- Outcome
- P distribution to shootse0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It severely depressed DM distribution but enhanced P distribution to shoots thus doubling shoot P concentration”
e1“Severe Zn deficiency enhanced P concentration to 3 to 4% in old leaves”
e2“young wheat plants ( Triticum aestivum L. ‘Gamenya’)”
Claim · model-written summary
Severe deficiency doubled shoot phosphorus concentration.
- Taxon
- wheatTriticum aestivume2
- Treatment
- Severe Zn deficiencye1
- Outcome
- shoot P concentratione0
- Direction
- doublinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thus doubling shoot P concentration”
e1“Severe Zn deficiency enhanced P concentration to 3 to 4% in old leaves”
e2“young wheat plants ( Triticum aestivum L. ‘Gamenya’)”
Claim · model-written summary
Mild zinc deficiency transiently enhanced phosphate absorption rate.
- Taxon
- wheatTriticum aestivume1
- Treatment
- mild Zn deficiencye0
- Outcome
- Pi absorption ratee0
- Direction
- enhancinge0
- Qualifier
- transiente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mild Zn deficiency had only a transient effect in enhancing Pi absorption rate”
e1“young wheat plants ( Triticum aestivum L. ‘Gamenya’)”
Claim · model-written summary
Severe zinc deficiency substantially depressed phosphate absorption rate.
- Taxon
- wheatTriticum aestivume2
- Treatment
- severe Zn deficiencye0
- Outcome
- Pi absorption ratee1
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“severe Zn deficiency substantially depressed it”
e1“mild Zn deficiency had only a transient effect in enhancing Pi absorption rate”
e2“young wheat plants ( Triticum aestivum L. ‘Gamenya’)”
Claim · model-written summary
Zinc deficiency concentrated phosphorus in old leaves by depressing new growth.
- Taxon
- wheatTriticum aestivume1
- Outcome
- concentrated P in old leavese0
- Qualifier
- by depressing new growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“within shoots, it concentrated P in old leaves by depressing new growth”
e1“young wheat plants ( Triticum aestivum L. ‘Gamenya’)”
The same questions in other papers
zinc atom · growth · Triticum aestivum (wheat)Results differ
154 papers in the same direction as this paper · 43 in the opposite direction · 2 reporting no difference from an alternative
This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
- no effect
- no effect
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See all 200 papers →zinc atom · nutrient: content · Triticum aestivum (wheat)Results differ
346 papers in the same direction as this paper · 33 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- positive
- positive
376 papers more in this group
See all 380 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.