Abstract
Flowering in Poa pratensis L. cv. Holt and Bromus inermis Leyss. cv. Manchar requires exposure to short days (SD) for primary induction to occur, followed by long days (LD) to allow the inflorescence to develop. Weekly sprays with gibberellic acid (GA 3 ) during primary induction inhibited flower initiation in both P. pratensis and B. inermis . With 10 −4 M GA 3 flowering of P. pratensis was suppressed even after an induction period of 10 weeks. Since both GA 3 and non‐inductive LD conditions greatly stimulate leaf elongation, the degree of primary induction was closely negatively correlated with plant height (leaf sheath and blade length) at the end of the induction period. GA 3 application or the interpolation of LD during SD induction were most inhibitory during the later middle part of the SD period, whereas they were stimulatory near the beginning or immediately before the SD period. We suggest that changes in the portfolio or levels of endogenous gibberellins mediate photoperiodic control of growth and floral initiation in these plants. However, GA 3 sprays could not substitute for LD in causing heading and culm elongation in SD induced plants of the two species. The results are discussed in the light of results with other plants with dual floral induction requirements.
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Claims 9
Claim · model-written summary
Weekly GA 3 sprays inhibited flower initiation in Poa pratensis.
- Taxon
- P. pratensis
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Poa pratensise0 - Treatment
- Weekly sprays with gibberellic acid (GA 3 )e0
- Outcome
- flower initiatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Weekly sprays with gibberellic acid (GA 3 ) during primary induction inhibited flower initiation in both P. pratensis and B. inermis .”
Claim · model-written summary
Weekly GA 3 sprays inhibited flower initiation in Bromus inermis.
- Taxon
- B. inermis
Bromus inermise0 - Treatment
- Weekly sprays with gibberellic acid (GA 3 )e0
- Outcome
- flower initiatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Weekly sprays with gibberellic acid (GA 3 ) during primary induction inhibited flower initiation in both P. pratensis and B. inermis .”
Claim · model-written summary
At 10 −4 M GA 3, flowering of Poa pratensis remained suppressed after 10 weeks of induction.
- Taxon
- P. pratensisPoa pratensise0
- Treatment
- 10 −4 M GA 3e0
- Outcome
- floweringe0
- Direction
- suppressede0
- Qualifier
- an induction period of 10 weekse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With 10 −4 M GA 3 flowering of P. pratensis was suppressed even after an induction period of 10 weeks.”
Claim · model-written summary
Primary induction was negatively correlated with plant height.
Verbatim
e0“the degree of primary induction was closely negatively correlated with plant height (leaf sheath and blade length) at the end of the induction period”
Claim · model-written summary
GA 3 was most inhibitory in the later middle part of the short-day period.
- Taxon
- plantsViridiplantaee1
- Treatment
- GA 3 applicatione0
- Outcome
- most inhibitorye0
- Direction
- most inhibitorye0
Not reportedComparator
Verbatim
e0“GA 3 application or the interpolation of LD during SD induction were most inhibitory during the later middle part of the SD period”
e1“SD induced plants of the two species”
Claim · model-written summary
Interpolated long days were most inhibitory in the later middle part of short-day induction.
- Taxon
- plantsViridiplantaee1
- Treatment
- interpolation of LD during SD inductione0
- Outcome
- most inhibitorye0
- Direction
- most inhibitorye0
Not reportedComparator
Verbatim
e0“GA 3 application or the interpolation of LD during SD induction were most inhibitory during the later middle part of the SD period”
e1“SD induced plants of the two species”
Claim · model-written summary
GA 3 application was stimulatory near the beginning or just before the short-day period.
- Taxon
- plantsViridiplantaee1
- Treatment
- GA 3 applicatione0
- Outcome
- stimulatorye0
- Direction
- stimulatorye0
Not reportedComparator
Verbatim
e0“GA 3 application or the interpolation of LD during SD induction were most inhibitory during the later middle part of the SD period, whereas they were stimulatory near the beginning or immediately before the SD period”
e1“SD induced plants of the two species”
Claim · model-written summary
Interpolated long days were stimulatory near the beginning or just before the short-day period.
- Taxon
- plantsViridiplantaee1
- Treatment
- interpolation of LD during SD inductione0
- Outcome
- stimulatorye0
- Direction
- stimulatorye0
Not reportedComparator
Verbatim
e0“GA 3 application or the interpolation of LD during SD induction were most inhibitory during the later middle part of the SD period, whereas they were stimulatory near the beginning or immediately before the SD period”
e1“SD induced plants of the two species”
Claim · model-written summary
GA 3 sprays did not substitute for long days in causing heading and culm elongation in the two species.
Verbatim
e0“GA 3 sprays could not substitute for LD in causing heading and culm elongation in SD induced plants of the two species”
The same questions in other papers
Gibberellic acid · growth · Viridiplantae (plants)Positive and negative results
6 reporting no difference from an alternative
- positive
- positive
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See all 7 papers →application · growth · Viridiplantae (plants)Positive and negative results
2 papers in the same direction as this paper · 7 reporting no difference from an alternative
- positive
- positive
- positive
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.