Abstract
Cotton ( Gossypium hirsutum L. cv. Deltapine 15/21) plants were precultured for 19 to 25 days under controlled climatic conditions in nutrient solutions with different levels of Zn. With the onset of visual Zn‐deficiency symptoms the pH of the nutrient solution decreased from 6.0 to about 5.0. In contrast, Zn‐sufficient plants raised the pH of the nutrient solution to about 7.0. In short‐term studies it could be demonstrated that the Zn nutritional status of the plants remarkably influenced the uptake and translocation rates of mineral nutrients. Compared to Zn‐sufficient plants, P uptake rate in severely Zn‐deficient plants was increased by a factor of 2 to 3, whereas the uptake rates of K, Ca and particularly NO 3 decreased. The accumulation of P in the roots of Zn‐deficient plants was either not affected or even lower than in Zn‐sufficient plants. Thus, Zn deficiency had a specific enhancement effect on root to shoot transport of P. This enhancement effect of Zn deficiency on uptake and transport of P was similar at nutrient solution pH values of 7.0 and 5.8; i.e. it was not the result of acidification of the nutrient solution. After application of 36 CI, 86 Rb and 32 P to plant stems, basipetal transport of 36 CI and 86 Rb was not affected by the Zn nutritional status of the plants. However, in Zn‐deficient plants, only 7.8% of the 32 P was translocated basipetally compared to 34% in the Zn‐sufficient plants. A resupply of Zn for 19 h to Zn‐deficient plants enhanced basipetal 32 P transport. The results indicate that a feedback mechanism in the shoots is impaired in Zn‐deficient plants which controls the P uptake by roots and especially the P transport from roots to shoots. As a result of this impairment toxic concentrations of P accumulate in the leaves. The mechanism responsible is likely the retranslocation of P in the phloem from shoots to roots.
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Claims 13
Claim · model-written summary
The nutrient solution pH declined from 6.0 to about 5.0 as zinc deficiency symptoms appeared.
- Taxon
- Cotton
Gossypium hirsutumt0 - Outcome
- pH of the nutrient solutione0
- Direction
- decreasede0
- Value
- about 5.0e0
- Qualifier
- from 6.0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the onset of visual Zn‐deficiency symptoms the pH of the nutrient solution decreased from 6.0 to about 5.0.”
t0“Cotton”
Claim · model-written summary
Zinc-sufficient plants raised nutrient solution pH to about 7.0.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- pH of the nutrient solutione0
- Direction
- raisede0
- Value
- about 7.0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn‐sufficient plants raised the pH of the nutrient solution to about 7.0.”
t0“Cotton”
Claim · model-written summary
Severe zinc deficiency increased phosphorus uptake rate by a factor of 2 to 3.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- severely Zn‐deficiente0
- Outcome
- P uptake ratee0
- Direction
- increasede0
- Value
- a factor of 2 to 3e0
- Comparator
- Zn‐sufficient plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to Zn‐sufficient plants, P uptake rate in severely Zn‐deficient plants was increased by a factor of 2 to 3”
t0“Cotton”
Claim · model-written summary
Zinc deficiency decreased uptake rates of potassium, calcium, and especially nitrate.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- severely Zn‐deficient plantse1
- Outcome
- uptake rates of K, Ca and particularly NO 3e0
- Direction
- decreasede0
- Comparator
- Zn‐sufficient plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas the uptake rates of K, Ca and particularly NO 3 decreased.”
e1“Compared to Zn‐sufficient plants, P uptake rate in severely Zn‐deficient plants”
t0“Cotton”
Claim · model-written summary
Root phosphorus accumulation in zinc-deficient plants was unchanged or lower than in zinc-sufficient plants.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- Zn‐deficient plantse0
- Outcome
- accumulation of P in the rootse0
- Direction
- not affected or even lowere0
- Comparator
- Zn‐sufficient plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The accumulation of P in the roots of Zn‐deficient plants was either not affected or even lower than in Zn‐sufficient plants.”
t0“Cotton”
Claim · model-written summary
Zinc deficiency enhanced root-to-shoot phosphorus transport.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- Zn deficiencye0
- Outcome
- root to shoot transport of Pe0
- Direction
- enhancemente0
- Comparator
- Zn‐sufficient plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn deficiency had a specific enhancement effect on root to shoot transport of P.”
e1“Compared to Zn‐sufficient plants, P uptake rate”
t0“Cotton”
Claim · model-written summary
Zinc deficiency enhanced phosphorus uptake and transport similarly at solution pH 7.0 and 5.8.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- uptake and transport of Pe0
- Direction
- similare0
- Qualifier
- at nutrient solution pH values of 7.0 and 5.8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This enhancement effect of Zn deficiency on uptake and transport of P was similar at nutrient solution pH values of 7.0 and 5.8”
t0“Cotton”
Claim · model-written summary
Basipetal transport of 36 CI and 86 Rb after stem application was unaffected by zinc status.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- Zn nutritional statuse0
- Outcome
- basipetal transport of 36 CI and 86 Rbe0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After application of 36 CI, 86 Rb and 32 P to plant stems, basipetal transport of 36 CI and 86 Rb was not affected by the Zn nutritional status of the plants.”
t0“Cotton”
Claim · model-written summary
Zinc-deficient plants transported only 7.8% of 32 P basipetally.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- 32 P was translocated basipetallye0
- Value
- 7.8%e0
- Qualifier
- 34%e0
- Comparator
- Zn‐sufficient plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Zn‐deficient plants, only 7.8% of the 32 P was translocated basipetally compared to 34% in the Zn‐sufficient plants.”
t0“Cotton”
Claim · model-written summary
Resupplying zinc for 19 h enhanced basipetal 32 P transport in zinc-deficient plants.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- resupply of Zn for 19 he0
- Outcome
- basipetal 32 P transporte0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A resupply of Zn for 19 h to Zn‐deficient plants enhanced basipetal 32 P transport.”
t0“Cotton”
Claim · model-written summary
The authors infer that impaired shoot feedback under zinc deficiency controls phosphorus uptake and root-to-shoot transport.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- P uptake by roots and especially the P transport from roots to shootse0
- Qualifier
- a feedback mechanism in the shoots is impairede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a feedback mechanism in the shoots is impaired in Zn‐deficient plants which controls the P uptake by roots and especially the P transport from roots to shoots.”
t0“Cotton”
Claim · model-written summary
Toxic phosphorus concentrations accumulate in leaves as a result of impaired feedback.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- toxic concentrations of P accumulate in the leavese0
- Qualifier
- this impairmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As a result of this impairment toxic concentrations of P accumulate in the leaves.”
t0“Cotton”
Claim · model-written summary
The likely mechanism involves phosphorus retranslocation in phloem from shoots to roots.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- retranslocation of P in the phloem from shoots to rootse0
- Qualifier
- likelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mechanism responsible is likely the retranslocation of P in the phloem from shoots to roots.”
t0“Cotton”
The same questions in other papers
zinc atom · physiology: gas exchange · Gossypium hirsutum (cotton)Positive and negative results
1 in the opposite direction
- 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.