Abstract
Plant growth regulators (PGRs) alter tiller growth in cereals. This response may be dependent on daylength (DL). Standard height (HE) and dwarf oat cultivars were grown at 14- and 18-h DLs. Foliage was sprayed with chlormequat chloride (CCC) and ethephon at early growth stages to evaluate PGR effects on the growth of the main shoot and tillers. Two successive experiments with 10 replicates were arranged in two growth chambers (14-h and 18-h DL) at the University of Minnesota. Preanthesis main shoot and tiller HEs and dry weights (DWs) were measured. In Exp. 1, the numbers of leaves and green leaves were counted. Relative growth rate (RGR), relative elongation rate (RER), and shoot DW:HE ratio were measured. Plant growth regulators retarded growth of the main shoot in conventional oat cultivars without stimulating growth of T1 and T2 tillers. Response of the dwarf cultivar to PGRs was modest. Only ethephon enhanced T1 tiller growth at 18-h DL. However, PGR-treated plants had up to five more green leaves per plant at preanthesis due to stimulated leaf emergence on T3 and T4 tillers especially at the 18-h DL. In Exp. 1, PGR treatments reduced the DW to HE ratio, that is, shortened rather than strengthened the stem. In Exp. 2, measurements were made more frequently and ethephon first increased this ratio followed by a decrease. Thus, even though long-day conditions somewhat enhanced DW accumulation and stem elongation, few marked differences in oat response to PGR treatments were noted when comparing short- and long-day conditions.
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Claims 9
Claim · model-written summary
Plant growth regulators retarded growth of the main shoot in conventional oat cultivars.
- Taxon
- oat
Avena sativae1 - Material
- conventional oat cultivarse1
- Treatment
- Plant growth regulatorse1
- Outcome
- growth of the main shoote1
- Direction
- retardede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plant growth regulators retarded growth of the main shoot in conventional oat cultivars”
Claim · model-written summary
Plant growth regulators did not stimulate growth of T1 and T2 tillers in conventional oat cultivars.
- Taxon
- oatAvena sativae1
- Material
- conventional oat cultivarse1
- Treatment
- Plant growth regulatorse1
- Outcome
- growth of T1 and T2 tillerse2
- Direction
- without stimulatinge2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plant growth regulators retarded growth of the main shoot in conventional oat cultivars”
e2“without stimulating growth of T1 and T2 tillers”
Claim · model-written summary
The response of the dwarf oat cultivar to plant growth regulators was modest.
- Taxon
- oatAvena sativae1
- Material
- dwarf cultivare4
- Treatment
- PGRse4
- Outcome
- Response of the dwarf cultivar to PGRse4
- Qualifier
- modeste4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plant growth regulators retarded growth of the main shoot in conventional oat cultivars”
e4“Response of the dwarf cultivar to PGRs was modest”
Claim · model-written summary
PGR-treated oat plants had up to five more green leaves per plant at preanthesis, due to stimulated leaf emergence on T3 and T4 tillers, especially at 18-h daylength.
- Taxon
- oatAvena sativae1
- Organ / stage
- T3 and T4 tillerse3
- Treatment
- PGRe3
- Outcome
- green leaves per plante3
- Direction
- moree3
- Value
- up to fivee3
- Qualifier
- stimulated leaf emergencee3
- Setting
- 18-h DLe3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plant growth regulators retarded growth of the main shoot in conventional oat cultivars”
e3“PGR-treated plants had up to five more green leaves per plant at preanthesis due to stimulated leaf emergence on T3 and T4 tillers especially at the 18-h DL”
Claim · model-written summary
Ethephon alone enhanced T1 tiller growth at 18-h daylength.
- Taxon
- oatAvena sativae1
- Organ / stage
- T1 tillere4
- Treatment
- ethephone4
- Outcome
- T1 tiller growthe4
- Direction
- enhancede4
- Setting
- 18-h DLe4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plant growth regulators retarded growth of the main shoot in conventional oat cultivars”
e4“Only ethephon enhanced T1 tiller growth at 18-h DL”
Claim · model-written summary
In Experiment 1, PGR treatments reduced the shoot dry weight to height ratio, shortening rather than strengthening the stem.
- Taxon
- oatAvena sativae1
- Treatment
- PGR treatmentse5
- Outcome
- DW to HE ratioe5
- Direction
- reducede5
- Qualifier
- shortened rather than strengthened the steme5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plant growth regulators retarded growth of the main shoot in conventional oat cultivars”
e5“In Exp. 1, PGR treatments reduced the DW to HE ratio, that is, shortened rather than strengthened the stem”
Claim · model-written summary
In Experiment 2, ethephon first increased the shoot DW:HE ratio, followed by a decrease.
- Taxon
- oatAvena sativae1
- Treatment
- ethephone6
- Outcome
- shoot DW:HE ratioe7
- Direction
- increasede6
- Qualifier
- followed by a decreasee6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plant growth regulators retarded growth of the main shoot in conventional oat cultivars”
e6“In Exp. 2, measurements were made more frequently and ethephon first increased this ratio followed by a decrease”
e7“shoot DW:HE ratio were measured”
Claim · model-written summary
Long-day conditions somewhat enhanced dry matter accumulation and stem elongation in oat.
- Taxon
- oatAvena sativae1
- Treatment
- long-day conditionse0
- Outcome
- DW accumulation and stem elongatione0
- Direction
- somewhat enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plant growth regulators retarded growth of the main shoot in conventional oat cultivars”
e0“long-day conditions somewhat enhanced DW accumulation and stem elongation”
Claim · model-written summary
Few marked differences in oat response to PGR treatments were found between short- and long-day conditions.
- Taxon
- oatAvena sativae1
- Treatment
- short- and long-day conditionse0
- Outcome
- oat response to PGR treatmentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plant growth regulators retarded growth of the main shoot in conventional oat cultivars”
e0“few marked differences in oat response to PGR treatments were noted when comparing short- and long-day conditions”
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See all 12 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.