Abstract
SummaryPhotoselective plastic films with low transmission to far-red (FR) light (700–800 nm) are now available so that plants grown in greenhouses clad with such plastics exhibit reduced stem extension and, consequently, plant height. Here we compare the action of three FR-absorbing polythene films on extension growth of Petunia (Petunia hybrida) cv. ‘Express Blue’ and Impatiens walleriana cv. ‘Accent Deep Pink’ with plants grown under a control polythene film (standard UVI/EVA film). Half of the plants under the control film were treated with a chemical plant growth regulator (PGR; diaminozide, B-Nine) and half were sprayed with water alone. Possible negative effects of such film plastics on flowering, and on fresh and dry weight accumulation, were also quantified. Plants were harvested destructively when all plants in each treatment had reached the first open flower stage. In Petunia, plant height was reduced by all three FR-filtering films and by PGR-treatment. The FR-filtering films giving the highest R:FR ratios also reduced plant height in Impatiens. Leaf number, leaf area and total dry weight in both species were greatest in the controls and smallest under films with the lowest PAR transmission. The film giving the highest R:FR ratio and PAR transmission also produced the most compact Petunia plants; while the film with the lowest PAR transmission produced the least compact plants in both species. There was no significant effect of treatments on time to first flower in Impatiens. However, Petunia plants under low PAR transmission films took longer to flower. Plastic films which filter out FR light to increase the R:FR ratio, combined with high PAR transmission, can therefore be used as an alternative to conventional PGRs.
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Claims 11
Claim · model-written summary
All three far-red filtering films reduced Petunia height.
_flowers_in_Westgate_Gardens%2C_Canterbury.jpg?width=60){kind=small}
PetuniaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_flowers_in_Westgate_Gardens%2C_Canterbury.jpg?width=500)
Verbatim
t0“Petunia”
e0“In Petunia, plant height was reduced by all three FR-filtering films”
Claim · model-written summary
Plant growth regulator treatment reduced Petunia height.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Petunia”
e0“In Petunia, plant height was reduced by all three FR-filtering films and by PGR-treatment”
Claim · model-written summary
Films with the highest R:FR ratios reduced Impatiens height.
ImpatiensNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Impatiens”
e0“The FR-filtering films giving the highest R:FR ratios also reduced plant height in Impatiens”
Claim · model-written summary
Petunia leaf number, leaf area and dry weight were greatest in controls and smallest under the lowest PAR transmission films.
- Treatment
- films with the lowest PAR transmissione0
- Outcome
- Leaf number, leaf area and total dry weighte0
- Direction
- smalleste0
- Comparator
- the controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Petunia”
e0“Leaf number, leaf area and total dry weight in both species were greatest in the controls and smallest under films with the lowest PAR transmission.”
Claim · model-written summary
Impatiens leaf number, leaf area and dry weight were greatest in controls and smallest under the lowest PAR transmission films.
- Treatment
- films with the lowest PAR transmissione0
- Outcome
- Leaf number, leaf area and total dry weighte0
- Direction
- smalleste0
- Comparator
- the controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Impatiens”
e0“Leaf number, leaf area and total dry weight in both species were greatest in the controls and smallest under films with the lowest PAR transmission.”
Claim · model-written summary
The film with the highest R:FR ratio and PAR transmission produced the most compact Petunia plants.
- Treatment
- The film giving the highest R:FR ratio and PAR transmissione0
- Outcome
- most compacte0
- Direction
- most compacte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Petunia”
e0“The film giving the highest R:FR ratio and PAR transmission also produced the most compact Petunia plants”
Claim · model-written summary
The lowest PAR transmission film produced the least compact Petunia plants.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Petunia”
e0“the film with the lowest PAR transmission produced the least compact plants in both species”
Claim · model-written summary
The lowest PAR transmission film produced the least compact Impatiens plants.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Impatiens”
e0“the film with the lowest PAR transmission produced the least compact plants in both species”
Claim · model-written summary
Treatments had no significant effect on time to first flower in Impatiens.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Impatiens”
e0“There was no significant effect of treatments on time to first flower in Impatiens.”
Claim · model-written summary
Petunia plants under low PAR transmission films took longer to flower.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Petunia”
e0“Petunia plants under low PAR transmission films took longer to flower.”
Claim · model-written summary
The authors recommend far-red filtering films with high PAR transmission as an alternative to growth regulators.
- Treatment
- Plastic films which filter out FR lighte0
- Outcome
- used as an alternative to conventional PGRse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Petunia”
e0“Plastic films which filter out FR light to increase the R:FR ratio, combined with high PAR transmission, can therefore be used as an alternative to conventional PGRs.”
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See all 9 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.