Abstract
Department of Plant Production, PO Box 27, FIN-00014 University of Helsinki, Finland. Current address: MTT Agrifood Research Finland, Plant Production Research, FIN-31600 Jokioinen, Finland. e-mail: pirjo.peltonen-sainio@mtt.fi Plant growth regulators (PGRs) are not usually applied to oat (Avena sativa L.) crops. This study was designed to test whether the antigibberellin chlormequat chloride (CCC) and ethylene-releasing ethephon sprayed on to oat foliage represent potential agents for manipulation of yield formation under northern growing conditions. Effects of these PGRs on yield components and tiller growth and productivity were examined in detail. This study included a long-strawed landrace, a modern standard height cultivar, two naked (A. sativa ssp. nuda L.) and two dwarf oats. Field experiments were conducted at Viikki Experimental Farm, University of Helsinki, in 1995 and 1996. Chlormequat chloride was sprayed at the two-node stage and ethephon when the flag leaf ligule was just visible on the main shoot. Various traits characterizing growth and yield formation were assessed. Chlormequat chloride increased grain yield by 0% to 13% depending on cultivar and year, while ethephon most often decreased it by up to 17%. No lodging occurred and the recorded increase in grain yield of CCC treated plants was not therefore due to prevention of lodging. However, CCC treatment resulted in more panicles per square meter and in 1995 tillers contributed more to grain yield. Ethephon treated plants had less grains per main shoot panicle, lower panicle filling rate (PFR) and parallel decreased harvest index (HI). Stem elongation of dwarf oat was enhanced by CCC, in contrast to that of conventional and naked cultivars.;
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Claims 9
Claim · model-written summary
Chlormequat chloride increased oat grain yield by 0% to 13%, depending on cultivar and year.
- Taxon
- oat (Avena sativa L.)
Avena sativae0 - Treatment
- Chlormequat chloridee1
- Outcome
- grain yielde1
- Direction
- increasede1
- Value
- 0% to 13%e1
- Qualifier
- depending on cultivar and yeare1
- Setting
- Viikki Experimental Farme2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant growth regulators (PGRs) are not usually applied to oat (Avena sativa L.) crops”
e1“Chlormequat chloride increased grain yield by 0% to 13% depending on cultivar and year, while ethephon most often decreased it by up to 17%”
e2“Field experiments were conducted at Viikki Experimental Farm, University of Helsinki, in 1995 and 1996”
Claim · model-written summary
Ethephon most often decreased oat grain yield by up to 17%.
- Taxon
- oat (Avena sativa L.)Avena sativae0
- Treatment
- ethephone1
- Outcome
- grain yielde1
- Direction
- decreasede1
- Value
- up to 17%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant growth regulators (PGRs) are not usually applied to oat (Avena sativa L.) crops”
e1“Chlormequat chloride increased grain yield by 0% to 13% depending on cultivar and year, while ethephon most often decreased it by up to 17%”
Claim · model-written summary
No lodging occurred in the oat trials, so the grain yield increase under CCC was not due to lodging prevention.
- Taxon
- oat (Avena sativa L.)Avena sativae0
- Outcome
- lodginge3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant growth regulators (PGRs) are not usually applied to oat (Avena sativa L.) crops”
e3“No lodging occurred and the recorded increase in grain yield of CCC treated plants was not therefore due to prevention of lodging”
Claim · model-written summary
CCC treatment increased the number of panicles per square meter in oat.
- Taxon
- oat (Avena sativa L.)Avena sativae0
- Treatment
- CCC treatmente4
- Outcome
- panicles per square metere4
- Direction
- moree4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant growth regulators (PGRs) are not usually applied to oat (Avena sativa L.) crops”
e4“CCC treatment resulted in more panicles per square meter”
Claim · model-written summary
In 1995, tillers contributed more to oat grain yield.
- Taxon
- oat (Avena sativa L.)Avena sativae0
- Outcome
- tillers contributed more to grain yielde5
- Qualifier
- in 1995e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant growth regulators (PGRs) are not usually applied to oat (Avena sativa L.) crops”
e5“in 1995 tillers contributed more to grain yield”
Claim · model-written summary
Ethephon-treated oat had fewer grains per main shoot panicle.
- Taxon
- oat (Avena sativa L.)Avena sativae0
- Treatment
- Ethephone6
- Outcome
- grains per main shoot paniclee6
- Direction
- lesse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant growth regulators (PGRs) are not usually applied to oat (Avena sativa L.) crops”
e6“Ethephon treated plants had less grains per main shoot panicle, lower panicle filling rate (PFR) and parallel decreased harvest index (HI)”
Claim · model-written summary
Ethephon lowered the panicle filling rate of oat.
- Taxon
- oat (Avena sativa L.)Avena sativae0
- Treatment
- Ethephone6
- Outcome
- panicle filling rate (PFR)e6
- Direction
- lowere6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant growth regulators (PGRs) are not usually applied to oat (Avena sativa L.) crops”
e6“Ethephon treated plants had less grains per main shoot panicle, lower panicle filling rate (PFR) and parallel decreased harvest index (HI)”
Claim · model-written summary
Ethephon decreased the harvest index of oat.
- Taxon
- oat (Avena sativa L.)Avena sativae0
- Treatment
- Ethephone6
- Outcome
- harvest indexe6
- Direction
- decreasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant growth regulators (PGRs) are not usually applied to oat (Avena sativa L.) crops”
e6“Ethephon treated plants had less grains per main shoot panicle, lower panicle filling rate (PFR) and parallel decreased harvest index (HI)”
Claim · model-written summary
CCC enhanced stem elongation of dwarf oat, in contrast to conventional and naked cultivars.
- Taxon
- dwarf oatAvena sativae7
- Treatment
- CCCe7
- Outcome
- Stem elongatione7
- Direction
- enhancede7
- Comparator
- conventional and naked cultivarse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Stem elongation of dwarf oat was enhanced by CCC, in contrast to that of conventional and naked cultivars”
The same questions in other papers
(2-chloroethyl)phosphonic acid · yield · Avena sativa (oats)Results differ
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
chlormequat chloride · yield · Avena sativa (oats)Results differ
2 papers in the same direction as this paper · 7 in the opposite direction
- positive
- no effect
- negative
6 papers more in this group
See all 10 papers →chloride · yield · Avena sativa (oats)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
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.