Abstract
Although the source-sink relationship is an intrinsic factor affecting crop photosynthesis, the response of different source-sink types to nitrogen (N) availability in photoprotection and photosynthetic efficiency is still unclear. This study investigates the physiological mechanisms underlying differences in photosynthetic capacity and photoprotection in wheat with different source-sink relationships under varying N levels. Field experiments revealed that compared to sink-limited wheat (YM1), source-limited wheat (YM25 and ZM27) maintained higher chlorophyll content, maximum net photosynthetic rate ( Pn max ), and light energy utilization efficiency, and alleviated photoinhibition by reducing non-photochemical quenching (NPQ) and increasing the proportion of cyclic electron flow (CEF). Additionally, source-limited wheat flag leaves had higher carotenoid content and soluble protein content and stronger antioxidant capacity, which enabled them to scavenge reactive oxygen species, reduce membrane lipid peroxidation, and delay leaf senescence. N fertilization significantly improved wheat’s photosynthetic capacity and light energy utilization efficiency, alleviating photoinhibition. Source-limited wheat can still maintain the integrity of the photosynthetic apparatus under low N conditions by enhancing photoprotective mechanisms, showing stronger environmental adaptability. Therefore, proper N fertilization and optimization of source-sink relationships help improve wheat’s photosynthetic capacity and yield potential.
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Claims 8
Claim · model-written summary
Source-limited wheat had higher chlorophyll content, maximum photosynthetic rate and light energy utilization efficiency than sink-limited wheat.
- Taxon
- wheat
Triticum aestivumt0 - Material
- source-limited wheat (YM25 and ZM27)e0
- Outcome
- chlorophyll content, maximum net photosynthetic rate ( Pn max ), and light energy utilization efficiencye0
- Direction
- highere0
- Comparator
- sink-limited wheat (YM1)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared to sink-limited wheat (YM1), source-limited wheat (YM25 and ZM27) maintained higher chlorophyll content, maximum net photosynthetic rate ( Pn max ), and light energy utilization efficiency”
t0“wheat”
Claim · model-written summary
Source-limited wheat had reduced NPQ and increased CEF relative to sink-limited wheat.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- non-photochemical quenching (NPQ)e0
- Direction
- reducinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alleviated photoinhibition by reducing non-photochemical quenching (NPQ) and increasing the proportion of cyclic electron flow (CEF)”
t0“wheat”
Claim · model-written summary
Source-limited wheat increased the proportion of cyclic electron flow.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- proportion of cyclic electron flow (CEF)e0
- Direction
- increasinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the proportion of cyclic electron flow (CEF)”
t0“wheat”
Claim · model-written summary
Source-limited wheat flag leaves had higher carotenoid and soluble protein content and stronger antioxidant capacity.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- flag leavese0
- Outcome
- carotenoid content and soluble protein content and stronger antioxidant capacitye0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“source-limited wheat flag leaves had higher carotenoid content and soluble protein content and stronger antioxidant capacity”
t0“wheat”
Claim · model-written summary
Source-limited wheat scavenged reactive oxygen species, reduced membrane lipid peroxidation, and delayed leaf senescence.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- scavenge reactive oxygen species, reduce membrane lipid peroxidation, and delay leaf senescencee0
- Qualifier
- reactive oxygen speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“enabled them to scavenge reactive oxygen species, reduce membrane lipid peroxidation, and delay leaf senescence”
t0“wheat”
Claim · model-written summary
Nitrogen fertilization significantly improved wheat photosynthetic capacity and light utilization efficiency and alleviated photoinhibition.
- Taxon
- wheatTriticum aestivume0
- Treatment
- N fertilizatione0
- Outcome
- photosynthetic capacity and light energy utilization efficiencye0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilization significantly improved wheat’s photosynthetic capacity and light energy utilization efficiency, alleviating photoinhibition”
Claim · model-written summary
Source-limited wheat maintained photosynthetic apparatus integrity under low nitrogen through enhanced photoprotection.
- Taxon
- wheatTriticum aestivume0
- Outcome
- integrity of the photosynthetic apparatuse0
- Qualifier
- under low N conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Source-limited wheat can still maintain the integrity of the photosynthetic apparatus under low N conditions by enhancing photoprotective mechanisms”
Claim · model-written summary
The authors recommend proper nitrogen fertilization and source-sink optimization to improve wheat photosynthetic capacity and yield potential.
- Taxon
- wheatTriticum aestivume0
- Outcome
- proper N fertilization and optimization of source-sink relationshipse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proper N fertilization and optimization of source-sink relationships help improve wheat’s photosynthetic capacity and yield potential”
The same questions in other papers
fertilization · physiology: photosynthesis · Triticum aestivum (wheat)Positive and negative results
125 papers in the same direction as this paper · 6 in the opposite direction · 1 reporting no difference from an alternative
- positive
- no effect
- negative
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See all 133 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.