Abstract
The immediate and posteffects of various concentrations of NaNO 2 on ion uptake of wheat ( Triticum aestivum L. cv. GK Öthalom) seedlings were studied at different pH values. Without pretreatment, the higher the concentration of NaNO 2 the greater was the decrease in uptake of K + into the roots, both at pH 4 and pH 6. At pH 6 but not at pH 4 the reverse was true when the seedlings were pretreated with NaNO 2 . Due to the high Na + content of the roots, an effect of Na + in this process cannot be excluded. Nitrite was taken up by the roots more rapidly than nitrate. Nitrite at 0.1 m M in the medium induced the development of an uptake system for both NO − 2 and NO − 3 in wheat roots. At higher concentrations pretreatment with NO − 2 decreased NO − 3 uptake by the roots, but NO 3 did not inhibit the uptake of NO 2 . The toxic effect of NO − 2 was strongly pH dependent. Lower pH of the external solution led to an increased inhibition by NO − 2 of both ion uptake and growth of seedlings. The inhibitory effect of NO − 2 differed considerably for roots and shoots. The roots and especially the root hairs were particularly sensitive to NO − 2 treatment.
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Claims 9
Claim · model-written summary
Higher NaNO2 concentration decreased K+ uptake into wheat roots without pretreatment, at pH 4 and pH 6.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- concentration of NaNO 2e2
- Outcome
- uptake of K + into the rootse2
- Direction
- decreasee2
- Qualifier
- Without pretreatmente2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“on ion uptake of wheat”
e2“Without pretreatment, the higher the concentration of NaNO 2 the greater was the decrease in uptake of K + into the roots, both at pH 4 and pH 6”
Claim · model-written summary
Pretreatment with NaNO2 reversed the K+ uptake effect at pH 6 but not at pH 4 in wheat seedlings.
- Taxon
- wheatTriticum aestivume1
- Treatment
- pretreated with NaNO 2e4
- Outcome
- uptake of K + into the rootse2
- Direction
- reversee4
- Qualifier
- At pH 6 but not at pH 4e4
- Comparator
- Without pretreatmente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“on ion uptake of wheat”
e2“Without pretreatment, the higher the concentration of NaNO 2 the greater was the decrease in uptake of K + into the roots, both at pH 4 and pH 6”
e4“At pH 6 but not at pH 4 the reverse was true when the seedlings were pretreated with NaNO 2”
Claim · model-written summary
Nitrite was taken up by wheat roots more rapidly than nitrate.
- Taxon
- wheatTriticum aestivume1
- Outcome
- taken up by the rootse5
- Direction
- more rapidlye5
- Comparator
- nitratee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“on ion uptake of wheat”
e5“Nitrite was taken up by the roots more rapidly than nitrate”
Claim · model-written summary
Nitrite at 0.1 mM in the medium induced an uptake system in wheat roots.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Nitrite at 0.1 m Me6
- Outcome
- uptake systeme6
- Direction
- inducede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“on ion uptake of wheat”
e6“Nitrite at 0.1 m M in the medium induced the development of an uptake system”
Claim · model-written summary
Pretreatment with NO2 at higher concentrations decreased NO3 uptake by wheat roots.
- Taxon
- wheatTriticum aestivume1
- Treatment
- pretreatment with NO − 2e7
- Outcome
- NO − 3 uptake by the rootse7
- Direction
- decreasede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“on ion uptake of wheat”
e7“At higher concentrations pretreatment with NO − 2 decreased NO − 3 uptake by the roots, but NO 3 did not inhibit the uptake of NO 2”
Claim · model-written summary
NO3 did not inhibit NO2 uptake by wheat roots.
- Taxon
- wheatTriticum aestivume1
- Treatment
- NO 3e7
- Outcome
- uptake of NO 2e7
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“on ion uptake of wheat”
e7“At higher concentrations pretreatment with NO − 2 decreased NO − 3 uptake by the roots, but NO 3 did not inhibit the uptake of NO 2”
Claim · model-written summary
Lower pH of the external solution increased the inhibition of ion uptake and seedling growth of wheat by NO2.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Lower pH of the external solutione3
- Outcome
- inhibitione3
- Direction
- increasede3
- Qualifier
- both ion uptake and growth of seedlingse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“on ion uptake of wheat”
e3“Lower pH of the external solution led to an increased inhibition by NO − 2 of both ion uptake and growth of seedlings”
Claim · model-written summary
Wheat root hairs were particularly sensitive to NO2 treatment.
- Taxon
- wheatTriticum aestivume1
- Organ / stage
- root hairse0
- Outcome
- particularly sensitivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“on ion uptake of wheat”
e0“The inhibitory effect of NO − 2 differed considerably for roots and shoots. The roots and especially the root hairs were particularly sensitive”
Claim · model-written summary
The inhibitory effect of NO2 on wheat differed considerably between roots and shoots.
- Taxon
- wheatTriticum aestivume1
- Organ / stage
- roots and shootse0
- Outcome
- inhibitory effecte0
- Qualifier
- differed considerablye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“on ion uptake of wheat”
e0“The inhibitory effect of NO − 2 differed considerably for roots and shoots. The roots and especially the root hairs were particularly sensitive”
The same questions in other papers
ph · disease · Triticum aestivum (wheat)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 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.