Abstract
Water deficit stress usually diminishes nitrogen uptake by plants. There are evidences that some nitrogen fixing bacteria can alleviate this stress by supplying nitrogen and improving its metabolism in plants. Four Azospirillum strains, A. lipoferum AC45-II, A. brasilense AC46-I, A. irakense AC49-VII and A. irakense AC51-VI were tested for nitrate reductase activity (NRA). In a pot culture experiment using a sandy loam soil, wheat plants (Triticum aestivum L. cv. Sardari) were inoculated with these bacterial strains and three ranges of soil water potential (W1: -10 to -20, W2: -40 to -50 and W3: -65 to -75 kPa) were applied to the pots. All strains were positive in NRA test and the highest (7.63mg NO2-N.L-1.48h-1) was recorded for AC49-VII and the least (0.23mg NO2-N.L-1.48h-1) was belong to AC51-VI. Leaf and root NRA, root and shoot nitrogen concentrations, and dry weights of root and shoot decreased by increasing water deficit stress. All four bacterial strains caused a significant enhancement in root NRA and in each water deficit level, the higher root NRA was recorded in AC46-I and AC49-VII inoculated plants. The highest leaf NRA was achieved by AC49-VII. The mean increment of root NRA by bacterial strains was 171% compared to the non-bacterial plants. Moreover, at the highest level of water deficit stress, the highest dry weight and nitrogen concentration in root and shoot were obtained by AC46-I and AC49-VII treatments.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-sa. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
Increasing water deficit decreased leaf and root nitrate reductase activity.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- water deficit stresse0
- Outcome
- Leaf and root NRAe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf and root NRA, root and shoot nitrogen concentrations, and dry weights of root and shoot decreased by increasing water deficit stress.”
t0“Wheat Plant”
Claim · model-written summary
Increasing water deficit decreased root and shoot nitrogen concentrations.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- water deficit stresse0
- Outcome
- root and shoot nitrogen concentrationse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf and root NRA, root and shoot nitrogen concentrations, and dry weights of root and shoot decreased by increasing water deficit stress.”
t0“Wheat Plant”
Claim · model-written summary
Increasing water deficit decreased root and shoot dry weights.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- water deficit stresse0
- Outcome
- dry weights of root and shoote0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf and root NRA, root and shoot nitrogen concentrations, and dry weights of root and shoot decreased by increasing water deficit stress.”
t0“Wheat Plant”
Claim · model-written summary
All four bacterial strains significantly enhanced root nitrate reductase activity.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- bacterial strainse0
- Interactor
- Azospirillum
Azospirillumt0symbiont - Outcome
- root NRAe0
- Direction
- enhancemente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All four bacterial strains caused a significant enhancement in root NRA”
t0“Azospirillum Inoculation Alters Nitrate Reductase Activity and Nitrogen Uptake in Wheat Plant”
Claim · model-written summary
AC46-I inoculated plants had higher root nitrate reductase activity at each deficit level.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- AC46-Ie0
- Outcome
- root NRAe0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in each water deficit level, the higher root NRA was recorded in AC46-I and AC49-VII inoculated plants.”
t0“Wheat Plant”
Claim · model-written summary
AC49-VII inoculated plants had higher root nitrate reductase activity at each deficit level.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- AC49-VIIe0
- Outcome
- root NRAe0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in each water deficit level, the higher root NRA was recorded in AC46-I and AC49-VII inoculated plants.”
t0“Wheat Plant”
Claim · model-written summary
AC49-VII produced the highest leaf nitrate reductase activity.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- AC49-VIIe0
- Outcome
- leaf NRAe0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest leaf NRA was achieved by AC49-VII.”
t0“Wheat Plant”
Claim · model-written summary
Bacterial strains increased mean root NRA by 171% relative to non bacterial plants.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- bacterial strainse0
- Outcome
- root NRAe0
- Direction
- incremente0
- Value
- 171%e0
- Comparator
- non-bacterial plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean increment of root NRA by bacterial strains was 171% compared to the non-bacterial plants.”
t0“Wheat Plant”
Claim · model-written summary
AC46-I produced the highest root and shoot dry weight and nitrogen concentration at greatest water deficit.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- AC46-Ie0
- Outcome
- dry weight and nitrogen concentration in root and shoote0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at the highest level of water deficit stress, the highest dry weight and nitrogen concentration in root and shoot were obtained by AC46-I and AC49-VII treatments.”
t0“Wheat Plant”
Claim · model-written summary
AC49-VII produced the highest root and shoot dry weight and nitrogen concentration at greatest water deficit.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- AC49-VIIe0
- Outcome
- dry weight and nitrogen concentration in root and shoote0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at the highest level of water deficit stress, the highest dry weight and nitrogen concentration in root and shoot were obtained by AC46-I and AC49-VII treatments.”
t0“Wheat Plant”
The same questions in other papers
inoculation · Azospirillum · Triticum aestivum (wheat)Positive and negative results
8 papers in the same direction as this paper · 1 reporting no difference from an alternative
- no effect
- positive
- positive
6 papers more in this group
See all 10 papers →drought · physiology: enzyme activity · Triticum aestivum (wheat)Positive and negative results
12 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
17 papers more in this group
See all 21 papers →inoculation · physiology: enzyme activity · Triticum aestivum (wheat)Positive and negative results
28 papers in the same direction as this paper · 2 in the opposite direction
- positive
- negative
- no effect
27 papers more in this group
See all 31 papers →drought · nutrient: content · Triticum aestivum (wheat)Positive and negative results
47 papers in the same direction as this paper · 12 in the opposite direction
- positive
- positive
- positive
56 papers more in this group
See all 60 papers →drought · growth · Triticum aestivum (wheat)Positive and negative results
344 papers in the same direction as this paper · 86 in the opposite direction
- positive
- positive
- positive
427 papers more in this group
See all 431 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.