Abstract
Development of sunflower plants grown in pots under controlled conditions was monitored at frequent intervals. Two separate water stresses, which reached a minimum of –1.7 MPa, were imposed at specified developmental stages on two separate batches of plants. Leaf initiation and leaf unfolding were significantly reduced by water stress. Inflorescence primordium initiation, involucre bract formation, disc and disc floret development were not affected. The mitotic index was reduced by water stress in unfolding leaves from 5 to 0.5 per cent. In other leaves, the mitotic index was reduced to a lesser extent. This reduced mitotic index helps explain reduction in leaf development. The time between seed germination and inflorescence primordium initiation remained relatively constant despite the reduced leaf number associated with water stress. The discussion evaluates the complications that this may cause in the comparison of leaves in the upper half of the leaf profile.
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Claims 7
Claim · model-written summary
Water stress significantly reduced leaf initiation and unfolding.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- water stresse0
- Outcome
- Leaf initiation and leaf unfoldinge0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf initiation and leaf unfolding were significantly reduced by water stress”
t0“sunflower”
Claim · model-written summary
Inflorescence and floral development were unaffected by water stress.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- water stresst1
- Outcome
- Inflorescence primordium initiation, involucre bract formation, disc and disc floret developmente0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inflorescence primordium initiation, involucre bract formation, disc and disc floret development were not affected”
t0“sunflower”
t1“Leaf initiation and leaf unfolding were significantly reduced by water stress”
Claim · model-written summary
Water stress reduced mitotic index in unfolding leaves from 5 to 0.5 per cent.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- water stresse0
- Outcome
- mitotic indexe0
- Direction
- reducede0
- Value
- 0.5 per cente0
- Qualifier
- from 5e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mitotic index was reduced by water stress in unfolding leaves from 5 to 0.5 per cent”
t0“sunflower”
Claim · model-written summary
Water stress reduced the mitotic index less in other leaves.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- other leavese0
- Treatment
- water stresst1
- Outcome
- mitotic indexe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In other leaves, the mitotic index was reduced to a lesser extent”
t0“sunflower”
t1“Leaf initiation and leaf unfolding were significantly reduced by water stress”
Claim · model-written summary
Reduced mitotic index helps explain lower leaf development.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- reduction in leaf developmente0
- Direction
- reductione0
- Qualifier
- reduced mitotic indexe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This reduced mitotic index helps explain reduction in leaf development”
t0“sunflower”
Claim · model-written summary
Time from germination to inflorescence initiation remained relatively constant under water stress.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- water stresse0
- Outcome
- time between seed germination and inflorescence primordium initiatione0
- Direction
- remained relatively constante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The time between seed germination and inflorescence primordium initiation remained relatively constant despite the reduced leaf number associated with water stress”
t0“sunflower”
Claim · model-written summary
Water stress reduced leaf number.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- water stresse0
- Outcome
- leaf numbere0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced leaf number associated with water stress”
t0“sunflower”
The same questions in other papers
drought · growth · Helianthus annuus (common sunflower)Results differ
49 papers in the same direction as this paper · 9 in the opposite direction
- negative
- negative
- positive
55 papers more in this group
See all 59 papers →drought · cytology · Helianthus annuus (common sunflower)Results agree
1 paper in the same direction as this paper
- negative
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.