Abstract
A primary determinant of yield in wheat ( Triticum aestivum L.) is the number of spike‐bearing tillers per unit area. Many tillers that emerge do not survive to produce spikes. This study was conducted to determine the point in development when tillers begin to senesce and to examine how premature senescence is affected by water deficits and plant population. Cultivars Edwall and Waverly were planted in a 2‐yr field study at two plant densities (168 and 84 kg ha −1 in 15‐ and 30‐cm rows, respectively) and with both irrigated and nonirrigated treatments. The Haun stage of leaf development was monitored weekly on five plants per plot. Tiller mortality was monitored from tiller emergence until maturity. For tillers destined to die prematurely, a reduced rate of leaf emergence and development was evident immediately after tiller emergence. The majority of tillers senesceduring main stem extension, while almost no tillers were lost during grain filling. The maximum Haun stage reached by senescing tillers was normally ≤3 for all tillers excepthe coleoptile (TO) tiller. For this tiller, the maximum Haun stage was ≤4. Premature tiller senescence occurred in both irrigated and nonirrigated plots and was greatest at the higher plant density. Water deficits increased the number of tillers that died but did not affect the stage at which senescence occurred. Tillers that emerged late during plant development were most likely to senesce prematurely.
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Claims 10
Claim · model-written summary
Tillers that died prematurely showed reduced leaf emergence and development immediately after emergence.
- Taxon
- Spring Wheat
Triticum aestivumt0 - Outcome
- rate of leaf emergence and developmente0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For tillers destined to die prematurely, a reduced rate of leaf emergence and development was evident immediately after tiller emergence.”
t0“Spring Wheat”
Claim · model-written summary
Most tillers senesced during main stem extension.
- Taxon
- Spring WheatTriticum aestivumt0
- Organ / stage
- main stem extensione0
- Outcome
- tillers senesceduring main stem extensione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The majority of tillers senesceduring main stem extension”
t0“Spring Wheat”
Claim · model-written summary
Almost no tillers were lost during grain filling.
- Taxon
- Spring WheatTriticum aestivumt0
- Organ / stage
- grain fillinge0
- Outcome
- tillers were loste0
- Direction
- almost noe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“almost no tillers were lost during grain filling”
t0“Spring Wheat”
Claim · model-written summary
Maximum Haun stage of senescing tillers was normally at most 3, except the coleoptile tiller.
- Taxon
- Spring WheatTriticum aestivumt0
- Outcome
- maximum Haun stage reached by senescing tillerse0
- Value
- ≤3e0
- Qualifier
- excepthe coleoptile (TO) tillere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum Haun stage reached by senescing tillers was normally ≤3 for all tillers excepthe coleoptile (TO) tiller”
t0“Spring Wheat”
Claim · model-written summary
The coleoptile tiller reached a maximum Haun stage of at most 4.
- Taxon
- Spring WheatTriticum aestivumt0
- Organ / stage
- tillere0
- Outcome
- maximum Haun stagee0
- Value
- ≤4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For this tiller, the maximum Haun stage was ≤4”
t0“Spring Wheat”
Claim · model-written summary
Premature tiller senescence occurred in irrigated and nonirrigated plots.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- irrigated and nonirrigated plotse0
- Outcome
- Premature tiller senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Premature tiller senescence occurred in both irrigated and nonirrigated plots”
t0“Spring Wheat”
Claim · model-written summary
Premature tiller senescence was greatest at higher plant density.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- higher plant densitye0
- Outcome
- was greateste0
- Direction
- greateste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was greatest at the higher plant density”
t0“Spring Wheat”
Claim · model-written summary
Water deficits increased the number of tillers that died.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- Water deficitse0
- Outcome
- number of tillers that diede0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water deficits increased the number of tillers that died”
t0“Spring Wheat”
Claim · model-written summary
Water deficits did not affect the stage at which tillers senesced.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- Water deficitse0
- Outcome
- stage at which senescence occurrede0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water deficits increased the number of tillers that died but did not affect the stage at which senescence occurred”
t0“Spring Wheat”
Claim · model-written summary
Late emerging tillers were most likely to senesce prematurely.
- Taxon
- Spring WheatTriticum aestivumt0
- Organ / stage
- emerged late during plant developmente0
- Outcome
- senesce prematurelye0
- Direction
- most likelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillers that emerged late during plant development were most likely to senesce prematurely”
t0“Spring Wheat”
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