Abstract
• The co-ordination between floret initiation and meristem expansion, and their relationships with carbon availability, were studied and quantified in sunflower (Helianthus annuus) plants subjected to light or water shortages. • Meristem size, number of floret primordia, primordium size, rate of plant biomass accumulation, leaf area, photosynthetic rate, and soluble sugar content in the capitulum were measured until completion of floret initiation. • Although treatments differentially affected tissue expansion and biomass acquisition, a common relationship between the final number of florets and the rate and duration of meristem expansion was conserved. In the absence of water deficit, changes in relative expansion rate in the meristem paralleled changes in soluble sugar content. Water deficit reduced tissue expansion both in leaves and in the capitulum, and induced the accumulation of soluble sugars in the meristem. Use of these sugars at re-watering was associated with increased meristem growth and higher floret numbers compared with control plants. • Floret initiation and meristem tissue expansion remained strongly co-ordinated under all studied circumstances, and both depended on local carbon availability when water supply was unlimited. Transient water deficits favoured reproductive meristem growth and floret production. Equations accounting for these results constitute a framework for phenotyping the response to drought.
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Claims 10
Claim · model-written summary
Final floret number remained related to meristem expansion rate and duration across treatments.
- Taxon
- sunflower
Helianthus annuuse1 - Organ / stage
- meristeme0
- Outcome
- final number of floretse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a common relationship between the final number of florets and the rate and duration of meristem expansion was conserved.”
e1“sunflower (Helianthus annuus) plants subjected to light or water shortages”
Claim · model-written summary
Meristem expansion rate paralleled soluble sugar content without water deficit.
- Taxon
- sunflowerHelianthus annuuse1
- Compound
- soluble sugare0
- Outcome
- relative expansion rate in the meristeme0
- Qualifier
- absence of water deficite0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the absence of water deficit, changes in relative expansion rate in the meristem paralleled changes in soluble sugar content.”
e1“sunflower (Helianthus annuus) plants subjected to light or water shortages”
Claim · model-written summary
Water deficit reduced tissue expansion in leaves and capitulum.
- Taxon
- sunflowerHelianthus annuuse1
- Organ / stage
- leaves and in the capitulume0
- Treatment
- Water deficite0
- Outcome
- tissue expansione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water deficit reduced tissue expansion both in leaves and in the capitulum”
e1“sunflower (Helianthus annuus) plants subjected to light or water shortages”
Claim · model-written summary
Water deficit induced soluble sugar accumulation in the meristem.
- Taxon
- sunflowerHelianthus annuuse1
- Treatment
- Water deficite0
- Outcome
- accumulation of soluble sugars in the meristeme0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water deficit reduced tissue expansion both in leaves and in the capitulum, and induced the accumulation of soluble sugars in the meristem.”
e1“sunflower (Helianthus annuus) plants subjected to light or water shortages”
Claim · model-written summary
Sugar use after rewatering was associated with increased meristem growth.
- Taxon
- sunflowerHelianthus annuuse1
- Compound
- sugarse0
- Outcome
- meristem growthe0
- Direction
- increasede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Use of these sugars at re-watering was associated with increased meristem growth and higher floret numbers compared with control plants.”
e1“sunflower (Helianthus annuus) plants subjected to light or water shortages”
Claim · model-written summary
Sugar use after rewatering was associated with higher floret numbers.
- Taxon
- sunflowerHelianthus annuuse1
- Compound
- sugarse0
- Outcome
- floret numberse0
- Direction
- highere0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Use of these sugars at re-watering was associated with increased meristem growth and higher floret numbers compared with control plants.”
e1“sunflower (Helianthus annuus) plants subjected to light or water shortages”
Claim · model-written summary
Floret initiation and meristem expansion remained coordinated.
- Taxon
- sunflowerHelianthus annuuse1
- Outcome
- Floret initiation and meristem tissue expansione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Floret initiation and meristem tissue expansion remained strongly co-ordinated under all studied circumstances”
e1“sunflower (Helianthus annuus) plants subjected to light or water shortages”
Claim · model-written summary
Both processes depended on local carbon availability with unlimited water.
- Taxon
- sunflowerHelianthus annuuse1
- Compound
- carbone0
- Outcome
- Floret initiation and meristem tissue expansione0
- Qualifier
- when water supply was unlimitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Floret initiation and meristem tissue expansion remained strongly co-ordinated under all studied circumstances, and both depended on local carbon availability when water supply was unlimited.”
e1“sunflower (Helianthus annuus) plants subjected to light or water shortages”
Claim · model-written summary
Transient water deficits favored reproductive meristem growth and floret production.
- Taxon
- sunflowerHelianthus annuuse1
- Treatment
- Transient water deficitse0
- Outcome
- reproductive meristem growth and floret productione0
- Direction
- favourede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transient water deficits favoured reproductive meristem growth and floret production.”
e1“sunflower (Helianthus annuus) plants subjected to light or water shortages”
Claim · model-written summary
The equations provide a framework to phenotype drought response.
- Taxon
- sunflowerHelianthus annuuse1
- Outcome
- framework for phenotyping the response to droughte0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Equations accounting for these results constitute a framework for phenotyping the response to drought.”
e1“sunflower (Helianthus annuus) plants subjected to light or water shortages”
The same questions in other papers
drought · yield · Helianthus annuus (common sunflower)Positive and negative results
12 papers in the same direction as this paper · 62 in the opposite direction
- negative
- negative
- negative
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See all 75 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.