Abstract
Abstract Hydroponically grown wheat seedlings were treated with 50 μM N i and/or 15 μM Se. After a 7-day culture period, their growth parameters, N i, Se, F e, and M g contents, electrolyte leakage, photosynthetic pigment concentrations, and photochemical activity of photosystem II were determined. Exposure of wheat seedlings to N i alone resulted in reduction in the total shoot and root lengths, by 22% and 50%, respectively. Addition of Se to the N i-containing medium significantly improved the growth of these organs, compared to the seedlings subjected to N i alone. Application of Se decreased the accumulation of N i in shoots and roots and partially alleviated the N i-induced decrease in F e and M g concentations in shoots. Electrolyte leakage increased in response to N i stress, but in shoots it was diminished by Se supplementation. Exposure to N i led to a decrease in chlorophyll a and b contents and enhancement of chlorophyll a/b ratio, but did not influence the concentration of carotenoids. Enrichment of the N i-containing medium with Se significantly increased chlorophyll b content, compared to the seedlings treated with N i alone. Photochemical activity, estimated in terms of the maximum quantum yield of photosystem II , decreased in response to N i treatment but was significantly improved by simultaneous addition of Se. Results of our study suggest that alleviation of N i toxicity in wheat seedlings by Se supplementation may be related to limitation of N i uptake.
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Claims 14
Claim · model-written summary
Nickel alone reduced total shoot length by 22%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure of wheat seedlings to N i alone resulted in reduction in the total shoot and root lengths, by 22% and 50%, respectively.”
Claim · model-written summary
Nickel alone reduced total root length by 50%.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- N i alonee0
- Outcome
- root lengthse0
- Direction
- reductione0
- Value
- 50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure of wheat seedlings to N i alone resulted in reduction in the total shoot and root lengths, by 22% and 50%, respectively.”
Claim · model-written summary
Selenium significantly improved shoot and root growth compared with nickel alone.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Addition of Se to the N i-containing mediume0
- Outcome
- growth of these organse0
- Direction
- improvede0
- Comparator
- seedlings subjected to N i alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of Se to the N i-containing medium significantly improved the growth of these organs, compared to the seedlings subjected to N i alone.”
e1“Hydroponically grown wheat seedlings”
Claim · model-written summary
Selenium decreased nickel accumulation in shoots and roots.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Application of See0
- Outcome
- accumulation of N i in shoots and rootse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of Se decreased the accumulation of N i in shoots and roots”
e1“Hydroponically grown wheat seedlings”
Claim · model-written summary
Selenium partly alleviated nickel-induced decreases in shoot iron and magnesium concentrations.
- Taxon
- wheatTriticum aestivume2
- Treatment
- Application of See1
- Outcome
- F e and M g concentations in shootse0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“partially alleviated the N i-induced decrease in F e and M g concentations in shoots.”
e1“Application of Se”
e2“Hydroponically grown wheat seedlings”
Claim · model-written summary
Nickel stress increased electrolyte leakage.
- Taxon
- wheatTriticum aestivume1
- Treatment
- N i stresse0
- Outcome
- Electrolyte leakagee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Electrolyte leakage increased in response to N i stress”
e1“Hydroponically grown wheat seedlings”
Claim · model-written summary
Selenium diminished shoot electrolyte leakage under nickel stress.
- Taxon
- wheatTriticum aestivume2
- Organ / stage
- shootse0
- Treatment
- Se supplementatione0
- Outcome
- Electrolyte leakagee1
- Direction
- diminishede0
- Comparator
- N i stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but in shoots it was diminished by Se supplementation.”
e1“Electrolyte leakage increased in response to N i stress”
e2“Hydroponically grown wheat seedlings”
Claim · model-written summary
Nickel decreased chlorophyll a and b contents.
- Taxon
- wheatTriticum aestivume1
- Treatment
- N ie0
- Outcome
- chlorophyll a and b contentse0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to N i led to a decrease in chlorophyll a and b contents”
e1“Hydroponically grown wheat seedlings”
Claim · model-written summary
Nickel increased the chlorophyll a/b ratio.
- Taxon
- wheatTriticum aestivume2
- Treatment
- N ie1
- Outcome
- chlorophyll a/b ratioe0
- Direction
- enhancemente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“enhancement of chlorophyll a/b ratio”
e1“Exposure to N i”
e2“Hydroponically grown wheat seedlings”
Claim · model-written summary
Nickel did not affect carotenoid concentration.
- Taxon
- wheatTriticum aestivume2
- Treatment
- N ie1
- Outcome
- concentration of carotenoidse0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not influence the concentration of carotenoids.”
e1“Exposure to N i”
e2“Hydroponically grown wheat seedlings”
Claim · model-written summary
Selenium increased chlorophyll b content relative to nickel alone.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Enrichment of the N i-containing medium with See0
- Outcome
- chlorophyll b contente0
- Direction
- increasede0
- Comparator
- seedlings treated with N i alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Enrichment of the N i-containing medium with Se significantly increased chlorophyll b content, compared to the seedlings treated with N i alone.”
e1“Hydroponically grown wheat seedlings”
Claim · model-written summary
Nickel decreased maximum quantum yield of photosystem II.
- Taxon
- wheatTriticum aestivume1
- Treatment
- N i treatmente0
- Outcome
- maximum quantum yield of photosystem IIe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photochemical activity, estimated in terms of the maximum quantum yield of photosystem II , decreased in response to N i treatment”
e1“Hydroponically grown wheat seedlings”
Claim · model-written summary
Adding selenium improved photosystem II photochemical activity under nickel exposure.
- Taxon
- wheatTriticum aestivume1
- Treatment
- simultaneous addition of See0
- Outcome
- Photochemical activitye0
- Direction
- improvede0
- Comparator
- N i treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photochemical activity, estimated in terms of the maximum quantum yield of photosystem II , decreased in response to N i treatment but was significantly improved by simultaneous addition of Se.”
e1“Hydroponically grown wheat seedlings”
Claim · model-written summary
The authors suggest that reduced nickel uptake may explain selenium protection.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Se supplementatione0
- Outcome
- alleviation of N i toxicitye0
- Qualifier
- limitation of N i uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alleviation of N i toxicity in wheat seedlings by Se supplementation may be related to limitation of N i uptake.”
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