Abstract
Abstract The plant growth regulator ethephon ([2‐chloroethyl] phosphoric acid) has often been used to reduce height and lodging of intensively managed soft red winter (SRW) wheat [ Triticum aestivum (L.) em. Thell]. The effect of ethephon on traits that determine grain yield has not been widely studied. This study was conducted to determine whether ethephon alters N use and other yield‐related traits in SRW wheat. Nine SRW cultivars were evaluated for 2 yr near Lexington, KY on a Maury silt loam (fine, mixed, mesic Typic Paleudalf). Lodging was negligible in both years. Total plant N at anthesis was significantly increased in plots treated with ethephon at Feekes growth stage (GS) 6 (12%) or GS 9 (15%). Similarly, dry matter (DM) at anthesis was increased 9 and 11% when ethephon was applied at GS 6 and 9, respectively. However, neither total N nor DM at maturity was significantly altered by ethephon application. Remobilization of vegetative N was increased 13% in ethephontreated plots. Ethephon applied at either GS increased the relative importance of N uptake efficiency vs. N partitioning efficiency in determining cultivar variation in N use efficiency. Application of ethephon did not alter grain yield, harvest index, or N harvest index. Ethephon had little or no influence on rate and duration of kernel growth, and slightly decreased kernel size (4%) when applied at GS 6. We conclude that ethephon has a minimal effect on the yield‐determining traits evaluated in this study. However, the pronounced effect of ethephon on the nature of cultivar differences in N use efficiency warrants further study.
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Claims 11
Claim · model-written summary
Ethephon at GS 6 increased total plant N at anthesis by 12%.
- Taxon
- Winter Wheat
Triticum aestivumt0 - Treatment
- ethephon at Feekes growth stage (GS) 6e0
- Outcome
- Total plant N at anthesise0
- Direction
- increasede0
- Value
- 12%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“Total plant N at anthesis was significantly increased in plots treated with ethephon at Feekes growth stage (GS) 6 (12%) or GS 9 (15%)”
Claim · model-written summary
Ethephon at GS 9 increased total plant N at anthesis by 15%.
- Taxon
- Winter WheatTriticum aestivumt0
- Organ / stage
- GS 9e0
- Treatment
- ethephone0
- Outcome
- Total plant N at anthesise0
- Direction
- increasede0
- Value
- 15%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“Total plant N at anthesis was significantly increased in plots treated with ethephon at Feekes growth stage (GS) 6 (12%) or GS 9 (15%)”
Claim · model-written summary
Ethephon at GS 6 increased anthesis dry matter by 9%.
- Taxon
- Winter WheatTriticum aestivumt0
- Organ / stage
- GS 6e0
- Treatment
- ethephone0
- Outcome
- dry matter (DM) at anthesise0
- Direction
- increasede0
- Value
- 9e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“dry matter (DM) at anthesis was increased 9 and 11% when ethephon was applied at GS 6 and 9, respectively”
Claim · model-written summary
Ethephon at GS 9 increased anthesis dry matter by 11%.
- Taxon
- Winter WheatTriticum aestivumt0
- Organ / stage
- 9e0
- Treatment
- ethephone0
- Outcome
- dry matter (DM) at anthesise0
- Direction
- increasede0
- Value
- 11%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“dry matter (DM) at anthesis was increased 9 and 11% when ethephon was applied at GS 6 and 9, respectively”
Claim · model-written summary
Ethephon did not significantly alter total N at maturity.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- ethephon applicatione0
- Outcome
- total Ne0
- Direction
- neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“neither total N nor DM at maturity was significantly altered by ethephon application”
Claim · model-written summary
Ethephon did not significantly alter dry matter at maturity.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- ethephon applicatione0
- Outcome
- DM at maturitye0
- Direction
- neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“neither total N nor DM at maturity was significantly altered by ethephon application”
Claim · model-written summary
Ethephon increased vegetative N remobilization by 13%.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- ethephontreatede0
- Outcome
- Remobilization of vegetative Ne0
- Direction
- increasede0
- Value
- 13%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“Remobilization of vegetative N was increased 13% in ethephontreated plots”
Claim · model-written summary
Ethephon increased the relative importance of N uptake efficiency versus N partitioning efficiency for cultivar variation in N use efficiency.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- Ethephone0
- Outcome
- relative importance of N uptake efficiencye0
- Direction
- increasede0
- Comparator
- N partitioning efficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“Ethephon applied at either GS increased the relative importance of N uptake efficiency vs. N partitioning efficiency in determining cultivar variation in N use efficiency”
Claim · model-written summary
Ethephon did not alter grain yield, harvest index or N harvest index.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- ethephone0
- Outcome
- grain yield, harvest index, or N harvest indexe0
- Direction
- did not altere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“Application of ethephon did not alter grain yield, harvest index, or N harvest index”
Claim · model-written summary
Ethephon had little or no effect on kernel growth rate and duration.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- Ethephone0
- Outcome
- rate and duration of kernel growthe0
- Direction
- little or no influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“Ethephon had little or no influence on rate and duration of kernel growth”
Claim · model-written summary
Ethephon at GS 6 decreased kernel size by 4%.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- applied at GS 6e0
- Outcome
- kernel sizee0
- Direction
- decreasede0
- Value
- 4%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“slightly decreased kernel size (4%) when applied at GS 6”
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