Abstract
Efficient nitrogen (N) nutrition has the potential to alleviate drought stress in crops by maintaining metabolic activities even at low tissue water potential. This study was aimed to understand the potential of N to minimize the effects of drought stress applied/occur during tillering (Feekes stage 2) and jointing (Feekes stage 6) growth stages of wheat by observing the regulations and limitations of physiological activities, crop growth rate during drought periods as well as final grain yields at maturity. In present study, pot cultured plants of a wheat cultivar Yangmai-16 were exposed to three water levels [severe stress at 35-40% field capacity (FC), moderate stress at 55-60% FC and well-watered at 75-80% FC] under two N rates (0.24 g and 0.16 g/kg soil). The results showed that the plants under severe drought stress accompanied by low N exhibited highly downregulated photosynthesis, and chlorophyll (Chl) fluorescence during the drought stress periods, and showed an accelerated grain filling rate with shortened grain filling duration (GFD) at post-anthesis, and reduced grain yields. Severe drought-stressed plants especially at jointing, exhibited lower Chl and Rubisco contents, lower efficiency of photosystem II and greater grain yield reductions. In contrast, drought-stressed plants under higher N showed tolerance to drought stress by maintaining higher leaf water potential, Chl and Rubisco content; lower lipid peroxidation associated with higher superoxide dismutase and ascorbate peroxidase activities during drought periods. The plants under higher N showed delayed senescence, increased GFD and lower grain yield reductions. The results of the study suggested that higher N nutrition contributed to drought tolerance in wheat by maintaining higher photosynthetic activities and antioxidative defense system during vegetative growth periods.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. 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 14
Claim · model-written summary
Severe drought with low nitrogen downregulated photosynthesis and chlorophyll fluorescence.
- Taxon
- Wheat
Triticum aestivumt0 - Treatment
- severe drought stress accompanied by low Ne0
- Outcome
- photosynthesis, and chlorophyll (Chl) fluorescencee0
- Direction
- downregulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants under severe drought stress accompanied by low N exhibited highly downregulated photosynthesis, and chlorophyll (Chl) fluorescence during the drought stress periods”
t0“Wheat (Triticum aestivum L.)”
Claim · model-written summary
Severe drought with low nitrogen accelerated grain filling rate.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- post-anthesise0
- Outcome
- grain filling ratee0
- Direction
- acceleratede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“showed an accelerated grain filling rate with shortened grain filling duration (GFD) at post-anthesis”
t0“Wheat (Triticum aestivum L.)”
Claim · model-written summary
Severe drought with low nitrogen shortened grain filling duration.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- post-anthesise0
- Outcome
- grain filling duration (GFD)e0
- Direction
- shortenede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“showed an accelerated grain filling rate with shortened grain filling duration (GFD) at post-anthesis”
t0“Wheat (Triticum aestivum L.)”
Claim · model-written summary
Severe drought with low nitrogen reduced grain yields.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- severe drought stress accompanied by low Ne1
- Outcome
- grain yieldse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced grain yields”
e1“plants under severe drought stress accompanied by low N”
t0“Wheat (Triticum aestivum L.)”
Claim · model-written summary
Severe drought, especially at jointing, lowered chlorophyll and Rubisco content.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- jointinge0
- Treatment
- Severe droughte0
- Outcome
- Chl and Rubisco contentse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe drought-stressed plants especially at jointing, exhibited lower Chl and Rubisco contents”
t0“Wheat (Triticum aestivum L.)”
Claim · model-written summary
Severe drought, especially at jointing, lowered photosystem II efficiency.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- jointinge0
- Treatment
- Severe droughte0
- Outcome
- efficiency of photosystem IIe0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe drought-stressed plants especially at jointing, exhibited lower Chl and Rubisco contents, lower efficiency of photosystem II”
t0“Wheat (Triticum aestivum L.)”
Claim · model-written summary
Severe drought, especially at jointing, caused greater grain yield reductions.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- jointinge0
- Treatment
- Severe droughte0
- Outcome
- grain yield reductionse0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe drought-stressed plants especially at jointing, exhibited lower Chl and Rubisco contents, lower efficiency of photosystem II and greater grain yield reductions.”
t0“Wheat (Triticum aestivum L.)”
Claim · model-written summary
Higher nitrogen under drought maintained higher leaf water potential, chlorophyll and Rubisco content.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- higher Ne0
- Outcome
- leaf water potential, Chl and Rubisco contente0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought-stressed plants under higher N showed tolerance to drought stress by maintaining higher leaf water potential, Chl and Rubisco content”
t0“Wheat (Triticum aestivum L.)”
Claim · model-written summary
Higher nitrogen under drought was associated with lower lipid peroxidation.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- higher Ne1
- Outcome
- lipid peroxidatione0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower lipid peroxidation associated with higher superoxide dismutase and ascorbate peroxidase activities during drought periods”
e1“drought-stressed plants under higher N”
t0“Wheat (Triticum aestivum L.)”
Claim · model-written summary
Higher nitrogen under drought was associated with higher superoxide dismutase and ascorbate peroxidase activities.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- higher Ne1
- Outcome
- superoxide dismutase and ascorbate peroxidase activitiese0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower lipid peroxidation associated with higher superoxide dismutase and ascorbate peroxidase activities during drought periods”
e1“drought-stressed plants under higher N”
t0“Wheat (Triticum aestivum L.)”
Claim · model-written summary
Higher nitrogen delayed wheat senescence.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- higher Ne0
- Outcome
- senescencee0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plants under higher N showed delayed senescence”
t0“Wheat (Triticum aestivum L.)”
Claim · model-written summary
Higher nitrogen increased grain filling duration.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- higher Ne0
- Outcome
- GFDe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plants under higher N showed delayed senescence, increased GFD and lower grain yield reductions.”
t0“Wheat (Triticum aestivum L.)”
Claim · model-written summary
Higher nitrogen reduced the extent of grain yield reductions.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- higher Ne0
- Outcome
- grain yield reductionse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plants under higher N showed delayed senescence, increased GFD and lower grain yield reductions.”
t0“Wheat (Triticum aestivum L.)”
Claim · model-written summary
Authors attribute higher-nitrogen drought tolerance to maintained photosynthesis and antioxidant defenses.
- Taxon
- wheatTriticum aestivume0
- Treatment
- higher N nutritione0
- Outcome
- drought tolerancee0
- Qualifier
- maintaining higher photosynthetic activities and antioxidative defense systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher N nutrition contributed to drought tolerance in wheat by maintaining higher photosynthetic activities and antioxidative defense system during vegetative growth periods”
The same questions in other papers
nitrogen · physiology: photosynthesis · Triticum aestivum (wheat)Positive and negative results
21 papers in the same direction as this paper · 98 in the opposite direction
- positive
- positive
- positive
116 papers more in this group
See all 120 papers →drought · physiology: photosynthesis · Triticum aestivum (wheat)Positive and negative results
204 papers in the same direction as this paper · 41 in the opposite direction
- negative
- negative
- negative
242 papers more in this group
See all 246 papers →drought · yield · Triticum aestivum (wheat)Positive and negative results
536 papers in the same direction as this paper · 95 in the opposite direction
- positive
- positive
- negative
628 papers more in this group
See all 632 papers →nitrogen · yield · Triticum aestivum (wheat)Positive and negative results
323 papers in the same direction as this paper · 1,737 in the opposite direction
- positive
- positive
- positive
2,057 papers more in this group
See all 2,061 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.