Abstract
ABSTRACT Fatty acid composition of Helianthus annuus L. (sunflower) oil depends on intercepted solar radiation per plant (ISR) during grain filling. This effect could be accounted for by the assimilate availability of the grains (the source‐sink ratio). However, the current physiological‐biochemical knowledge does not consider any effect of carbon availability on oil fatty acid composition. The objective of this work was to address the regulation of fatty acid composition by assimilate supply to sunflower grains. A wide range of source‐sink ratios was obtained by manipulating either the source or the sink during grain filling. Assimilate supply was also modified by injecting sucrose into the receptacle of sunflower capitula. Grain weight and oil content depended on both ISR and source‐sink ratio in a curvilinear manner. When sink size was decreased by grain excision, ISR failed to explain oil fatty acid composition, while source‐sink ratio appropriately described it. Sucrose injection significantly increased grain weight, oil content, and oleic acid percentage of shaded plants. It is concluded that effects of ISR on fatty acid composition are a consequence of changes in assimilate availability for grain oil synthesis. To explain these results a conceptual model is proposed: when assimilate supply limits grain growth and oil synthesis, mainly linoleic acid is synthesized. As the assimilate supply increases, oleic acid desaturation process gets saturated and oleic acid accumulates.
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Claims 7
Claim · model-written summary
Grain weight and oil content depended on both ISR and the source-sink ratio in a curvilinear manner.
- Taxon
- Sunflower
Helianthus annuust0 - Treatment
- ISR and source‐sink ratioe1
- Outcome
- grain weight and oil contente1
- Qualifier
- curvilinear mannere1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower Grains”
e1“Grain weight and oil content depended on both ISR and source‐sink ratio in a curvilinear manner”
Claim · model-written summary
When grain excision reduced sink size, ISR did not explain oil fatty acid composition.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- grain excisione2
- Outcome
- oil fatty acid compositione2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower Grains”
e2“When sink size was decreased by grain excision, ISR failed to explain oil fatty acid composition, while source‐sink ratio appropriately described it”
Claim · model-written summary
With grain excision, the source-sink ratio described oil fatty acid composition.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- source‐sink ratioe2
- Outcome
- oil fatty acid compositione2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower Grains”
e2“When sink size was decreased by grain excision, ISR failed to explain oil fatty acid composition, while source‐sink ratio appropriately described it”
Claim · model-written summary
Sucrose injection significantly increased grain weight, oil content and oleic acid percentage of shaded plants.
- Taxon
- SunflowerHelianthus annuust0
- Organ / stage
- receptacle of sunflower capitulae4
- Treatment
- Sucrose injectione3
- Outcome
- grain weight, oil content, and oleic acid percentagee3
- Direction
- increasede3
- Qualifier
- shaded plantse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower Grains”
e3“Sucrose injection significantly increased grain weight, oil content, and oleic acid percentage of shaded plants”
e4“Assimilate supply was also modified by injecting sucrose into the receptacle of sunflower capitula”
Claim · model-written summary
When assimilate supply limits grain growth and oil synthesis, mainly linoleic acid is synthesized (conceptual model).
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- mainly linoleic acid is synthesizede5
- Qualifier
- when assimilate supply limits grain growth and oil synthesise5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower Grains”
e5“when assimilate supply limits grain growth and oil synthesis, mainly linoleic acid is synthesized”
Claim · model-written summary
As assimilate supply increases, oleic acid desaturation becomes saturated and oleic acid accumulates (conceptual model).
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- oleic acid accumulatese6
- Qualifier
- As the assimilate supply increases, oleic acid desaturation process gets saturatede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower Grains”
e6“As the assimilate supply increases, oleic acid desaturation process gets saturated and oleic acid accumulates”
Claim · model-written summary
Effects of ISR on fatty acid composition are a consequence of changes in assimilate availability for grain oil synthesis.
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- effects of ISR on fatty acid compositione7
- Qualifier
- changes in assimilate availability for grain oil synthesise7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower Grains”
e7“effects of ISR on fatty acid composition are a consequence of changes in assimilate availability for grain oil synthesis”
The same questions in other papers
application · quality: oil · Helianthus annuus (common sunflower)Positive and negative results
40 papers in the same direction as this paper · 3 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- no effect
41 papers more in this group
See all 45 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.