Abstract
• Spike-localized photosynthesis sustains wheat grain filling efficiency. • Thermotolerant cvs. sustain higher sugar and enzyme activity. • Light exclusion alters assimilate partitioning and nutrient flow. • Rubisco, SuSy, SOD genes are highly light-responsive in spikes. • Shade-resilient genotypes display enhanced source–sink plasticity. This study comprehensively investigated the influence of tissue-specific light exclusion on carbon metabolism, assimilate partitioning, and grain quality across four contrasting wheat genotypes (HD2967, HD3086, HD2329, PBW343). Employing ¹⁴C labeling, biochemical assays, and gene expression analysis, we quantified CO₂ fixation, sucrose synthase (SuSy), superoxide dismutase (SOD), soluble starch synthase (SSS) activities, and sugar, protein, and micronutrient accumulation in flag leaf, stem, and spike tissues. Under full light, HD2967 and HD3086 consistently exhibited superior photosynthetic efficiency and assimilate partitioning. Flag leaf shading significantly reduced CO₂ fixation and associated metabolic activities, confirming its pivotal role. Direct spike shading severely impaired its CO₂ fixation, significantly reduced its SuSy and SSS activities, and diminished grain N, Fe, and Zn accumulation, highlighting the spike's critical photosynthetic role in grain-filling and quality. Interestingly, flag leaf and stem often showed compensatory increases in reducing sugars when the spike was shaded, suggesting altered carbon partitioning. Significant genotypic variability was observed with HD2967 showed strong stem sink activity and efficient assimilate translocation. HD2329 exhibited remarkable metabolic flexibility and robust compensatory translocation, indicating superior shade resilience. PBW343 was highly spike-dependent and sensitive to light exclusion. Gene expression of RuBisCo, SuSy, sHSP17 , and SOD was light-dependent, with spike tissues displaying significant light responsiveness. These findings highlight tissue-specific light perception, particularly in the spike, for sustaining grain development and nutrient accumulation, offering insights for breeding climate-resilient wheat cultivars.
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Claims 11
Claim · model-written summary
Under full light, HD2967 showed superior photosynthetic efficiency and assimilate partitioning.
- Taxon
- wheat
Triticum aestivumt0 - Material
- HD2967e0
- Outcome
- photosynthetic efficiency and assimilate partitioninge0
- Direction
- superiore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under full light, HD2967 and HD3086 consistently exhibited superior photosynthetic efficiency and assimilate partitioning”
t0“wheat”
Claim · model-written summary
Under full light, HD3086 showed superior photosynthetic efficiency and assimilate partitioning.
- Taxon
- wheatTriticum aestivumt0
- Material
- HD3086e0
- Outcome
- photosynthetic efficiency and assimilate partitioninge0
- Direction
- superiore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under full light, HD2967 and HD3086 consistently exhibited superior photosynthetic efficiency and assimilate partitioning”
t0“wheat”
Claim · model-written summary
Flag leaf shading significantly reduced CO₂ fixation and associated metabolic activities.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- Flag leafe0
- Treatment
- Flag leaf shadinge0
- Outcome
- CO₂ fixation and associated metabolic activitiese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flag leaf shading significantly reduced CO₂ fixation and associated metabolic activities”
t0“wheat”
Claim · model-written summary
Spike shading severely impaired spike CO₂ fixation.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- spikee0
- Treatment
- Direct spike shadinge0
- Outcome
- CO₂ fixatione0
- Direction
- impairede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Direct spike shading severely impaired its CO₂ fixation”
t0“wheat”
Claim · model-written summary
Spike shading significantly reduced SuSy and SSS activities.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- spikee0
- Treatment
- Direct spike shadinge0
- Outcome
- SuSy and SSS activitiese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Direct spike shading severely impaired its CO₂ fixation, significantly reduced its SuSy and SSS activities”
t0“wheat”
Claim · model-written summary
Spike shading diminished grain N, Fe and Zn accumulation.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- graine0
- Treatment
- Direct spike shadinge0
- Outcome
- grain N, Fe, and Zn accumulatione0
- Direction
- diminishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Direct spike shading severely impaired its CO₂ fixation, significantly reduced its SuSy and SSS activities, and diminished grain N, Fe, and Zn accumulation”
t0“wheat”
Claim · model-written summary
Spike shading often raised reducing sugars in the flag leaf and stem.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- flag leaf and steme0
- Treatment
- the spike was shadede0
- Outcome
- reducing sugarse0
- Direction
- increasese0
- Qualifier
- oftene0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“flag leaf and stem often showed compensatory increases in reducing sugars when the spike was shaded”
t0“wheat”
Claim · model-written summary
HD2967 showed strong stem sink activity and efficient assimilate translocation.
- Taxon
- wheatTriticum aestivumt0
- Material
- HD2967e0
- Organ / stage
- steme0
- Outcome
- stem sink activity and efficient assimilate translocatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HD2967 showed strong stem sink activity and efficient assimilate translocation”
t0“wheat”
Claim · model-written summary
HD2329 showed metabolic flexibility and compensatory translocation associated with shade resilience.
- Taxon
- wheatTriticum aestivumt0
- Material
- HD2329e0
- Outcome
- metabolic flexibility and robust compensatory translocatione0
- Qualifier
- superior shade resiliencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HD2329 exhibited remarkable metabolic flexibility and robust compensatory translocation, indicating superior shade resilience”
t0“wheat”
Claim · model-written summary
PBW343 was highly dependent on the spike and sensitive to light exclusion.
- Taxon
- wheatTriticum aestivumt0
- Material
- PBW343e0
- Outcome
- spike-dependent and sensitive to light exclusione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PBW343 was highly spike-dependent and sensitive to light exclusion”
t0“wheat”
Claim · model-written summary
Expression of RuBisCo, SuSy, sHSP17 and SOD depended on light, with spikes significantly responsive.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- spike tissuese0
- Treatment
- lighte0
- Gene
- RuBisCo, SuSy, sHSP17 , and SODe0
- Outcome
- Gene expressione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gene expression of RuBisCo, SuSy, sHSP17 , and SOD was light-dependent, with spike tissues displaying significant light responsiveness”
t0“wheat”
The same questions in other papers
shade · nutrient: content · Triticum aestivum (wheat)Positive and negative results
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See all 8 papers →shade · quality: sugar starch · Triticum aestivum (wheat)Positive and negative results
2 papers in the same direction as this paper · 7 in the opposite direction
- negative
- negative
- negative
6 papers more in this group
See all 10 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.