Abstract
Petiole elongation of strawberry plants ( Fragaria × ananassa ) is modified by photoperiod, and gibberellins may mediate this response. To test the relationship further, we measured petiole growth dynamics under short and long days, in comparison with responses to paclobutrazol, which reduces gibberellin biosynthesis. Growth rate in short days was lower after 2 days, and at its maximum was 60% of long-day controls. Petiole length at maturity was 75%, and was accounted for primarily by decreased cell length. Subsequent leaves showed similar patterns, but in the third leaf, cell number was also reduced. Petiole growth rate after treatment with paclobutrazol (5 mg plant–1) was maximal at 2 days, 44% of the control maximum at day 7. Mature length was 30% of controls, again due to reduced cell length. Second leaves had even more severely reduced growth rates. Increasing paclobutrazol concentration over the range 0.025–1.0 mg progressively reduced growth, but a gibberellin-independent component accounted for 20% of elongation. Effects of combined paclobutrazol and photoperiod treatments were additive. The normal short-day response therefore occurred in paclobutrazol-treated plants with already slowed growth and reduced capacity for gibberellin synthesis. We conclude that assessment of the function of gibberellins requires direct measurement of gibberellins in petioles during growth.
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Claims 13
Claim · model-written summary
Short days lowered petiole growth rate to 60% of long-day controls.
- Taxon
- strawberry
_single2.jpg?width=60)
Fragaria ×ananassat0 - Treatment
- short dayse0
- Outcome
- Growth ratee0
- Direction
- lowere0
- Value
- 60%e0
- Comparator
- long-day controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
e0“Growth rate in short days was lower after 2 days, and at its maximum was 60% of long-day controls.”
t0“strawberry ( Fragaria × ananassa )”
Claim · model-written summary
Short-day petiole length at maturity was 75% of controls.
- Taxon
- strawberryFragaria ×ananassat0
- Organ / stage
- Petiolee0
- Treatment
- short dayse1
- Outcome
- Petiole length at maturitye0
- Direction
- lowerinferrede0
- Value
- 75%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Petiole length at maturity was 75%, and was accounted for primarily by decreased cell length.”
t0“strawberry ( Fragaria × ananassa )”
e1“Growth rate in short days was lower after 2 days, and at its maximum was 60% of long-day controls.”
Claim · model-written summary
Decreased cell length primarily accounted for shorter mature petioles.
- Taxon
- strawberryFragaria ×ananassat0
- Organ / stage
- Petiolee0
- Outcome
- Petiole length at maturitye0
- Qualifier
- decreased cell lengthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Petiole length at maturity was 75%, and was accounted for primarily by decreased cell length.”
t0“strawberry ( Fragaria × ananassa )”
Claim · model-written summary
The third subsequent leaf also had fewer cells.
- Taxon
- strawberryFragaria ×ananassat0
- Organ / stage
- third leafe0
- Outcome
- cell numbere0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the third leaf, cell number was also reduced.”
t0“strawberry ( Fragaria × ananassa )”
Claim · model-written summary
Paclobutrazol-treated petioles reached 44% of control maximum growth rate.
- Taxon
- strawberryFragaria ×ananassat0
- Treatment
- paclobutrazol (5 mg plant–1)e0
- Outcome
- Petiole growth ratee0
- Direction
- lowerinferrede0
- Value
- 44%e0
- Comparator
- control maximume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Petiole growth rate after treatment with paclobutrazol (5 mg plant–1) was maximal at 2 days, 44% of the control maximum at day 7.”
t0“strawberry ( Fragaria × ananassa )”
Claim · model-written summary
Paclobutrazol reduced mature petiole length to 30% of controls.
- Taxon
- strawberryFragaria ×ananassat0
- Treatment
- paclobutrazole1
- Outcome
- Mature lengthe0
- Direction
- lowerinferrede0
- Value
- 30%e0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mature length was 30% of controls, again due to reduced cell length.”
t0“strawberry ( Fragaria × ananassa )”
e1“Petiole growth rate after treatment with paclobutrazol (5 mg plant–1) was maximal at 2 days, 44% of the control maximum at day 7.”
Claim · model-written summary
Reduced cell length accounted for shorter paclobutrazol-treated petioles.
- Taxon
- strawberryFragaria ×ananassat0
- Outcome
- Mature lengthe0
- Qualifier
- reduced cell lengthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mature length was 30% of controls, again due to reduced cell length.”
t0“strawberry ( Fragaria × ananassa )”
Claim · model-written summary
Second leaves had more severely reduced growth rates under paclobutrazol.
- Taxon
- strawberryFragaria ×ananassat0
- Organ / stage
- Second leavese0
- Outcome
- growth ratese0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Second leaves had even more severely reduced growth rates.”
t0“strawberry ( Fragaria × ananassa )”
Claim · model-written summary
Higher paclobutrazol concentration progressively reduced growth.
- Taxon
- strawberryFragaria ×ananassat0
- Treatment
- paclobutrazol concentration over the range 0.025–1.0 mge0
- Outcome
- growthe0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing paclobutrazol concentration over the range 0.025–1.0 mg progressively reduced growth”
t0“strawberry ( Fragaria × ananassa )”
Claim · model-written summary
A gibberellin-independent component accounted for 20% of elongation.
- Taxon
- strawberryFragaria ×ananassat0
- Outcome
- elongatione0
- Value
- 20%e0
- Qualifier
- gibberellin-independent componente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a gibberellin-independent component accounted for 20% of elongation.”
t0“strawberry ( Fragaria × ananassa )”
Claim · model-written summary
Paclobutrazol and photoperiod effects were additive.
- Taxon
- strawberryFragaria ×ananassat0
- Outcome
- Effects of combined paclobutrazol and photoperiod treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of combined paclobutrazol and photoperiod treatments were additive.”
t0“strawberry ( Fragaria × ananassa )”
Claim · model-written summary
Normal short-day response persisted in paclobutrazol-treated plants.
- Taxon
- strawberryFragaria ×ananassat0
- Treatment
- paclobutrazol-treated plantse0
- Outcome
- normal short-day responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The normal short-day response therefore occurred in paclobutrazol-treated plants with already slowed growth and reduced capacity for gibberellin synthesis.”
t0“strawberry ( Fragaria × ananassa )”
Claim · model-written summary
The authors recommend direct gibberellin measurements in growing petioles to assess gibberellin function.
- Taxon
- strawberryFragaria ×ananassat0
- Outcome
- direct measurement of gibberellins in petioles during growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“assessment of the function of gibberellins requires direct measurement of gibberellins in petioles during growth.”
t0“strawberry ( Fragaria × ananassa )”
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See all 68 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.