Abstract
Wheat (cv. Sun 9E) and barley (cv. Clipper) plants were subjected to water deficit after anthesis. In both species grain dry matter accumulation was initially unaffected by water deficit but terminated earlier in stressed plants than in controls. Water deficit did not affect endosperm cell number. In water stressed wheat plants the number of B-type starch granules per endosperm and the size of the largest A-type granules were significantly less than in control plants but A-type granule number was unaffected. Water potentials of wheat flag leaves and bracts were reduced by water deficit but this treatment did not affect grain water potential or osmotic potential during the first 29 days after anthesis. During these 29 days, neither grain nor bract water potential of barley was affected by stress and the water potential of bracts was relatively low even in control plants. Maturing grains eventually lost water and endosperm volume declined. This water loss occurred earlier in stressed plants. Stress significantly reduced the amount of sucrose per wheat grain but not the amount of sucrose per unit of grain dry matter or water content. In barley grains, stress did not reduce the relative or absolute sucrose contents. It was considered unlikely that the earlier cessation of grain growth on stressed plants was caused by insufficient assimilate. Although protein as a proportion of grain dry weight was higher in stressed plants than in controls, protein and amino acid content per grain were unaffected by water deficit.
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Claims 15
Claim · model-written summary
In wheat and barley, grain dry matter accumulation was initially unaffected by water deficit.
Not reportedTaxonComparator
Verbatim
e0“grain dry matter accumulation was initially unaffected by water deficit”
Claim · model-written summary
In wheat and barley, grain dry matter accumulation terminated earlier in stressed plants than in controls.
- Treatment
- water deficite1
- Outcome
- grain dry matter accumulatione0
- Direction
- earliere0
- Comparator
- controlse0
Not reportedTaxon
Verbatim
e0“grain dry matter accumulation was initially unaffected by water deficit but terminated earlier in stressed plants than in controls”
e1“water deficit after anthesis”
Claim · model-written summary
Water deficit did not affect endosperm cell number.
Not reportedTaxonComparator
Verbatim
e0“Water deficit did not affect endosperm cell number”
Claim · model-written summary
In water-stressed wheat, the number of B-type starch granules per endosperm and the size of the largest A-type granules were significantly less than in control plants.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- water stressede0
- Outcome
- number of B-type starch granules per endosperm and the size of the largest A-type granulese0
- Direction
- lesse0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In water stressed wheat plants the number of B-type starch granules per endosperm and the size of the largest A-type granules were significantly less than in control plants”
Claim · model-written summary
A-type starch granule number in wheat endosperm was unaffected by water deficit.
- Taxon
- wheatTriticum aestivume0
- Treatment
- water stressede0
- Outcome
- A-type granule numbere1
- Direction
- unaffectede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed wheat plants”
e1“A-type granule number was unaffected”
Claim · model-written summary
Water potentials of wheat flag leaves and bracts were reduced by water deficit.
- Taxon
- wheatTriticum aestivume0
- Treatment
- water deficite0
- Outcome
- Water potentials of wheat flag leaves and bractse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water potentials of wheat flag leaves and bracts were reduced by water deficit”
Claim · model-written summary
Water deficit did not affect grain water potential or osmotic potential during the first 29 days after anthesis.
- Treatment
- this treatmente0
- Outcome
- grain water potential or osmotic potentiale0
- Direction
- did not affecte0
Not reportedTaxonComparator
Verbatim
e0“this treatment did not affect grain water potential or osmotic potential during the first 29 days after anthesis”
Claim · model-written summary
In barley, neither grain nor bract water potential was affected by stress during the first 29 days.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- stresse0
- Outcome
- grain nor bract water potentiale0
- Direction
- was affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“neither grain nor bract water potential of barley was affected by stress”
Claim · model-written summary
Stress significantly reduced the amount of sucrose per wheat grain.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Stresse0
- Outcome
- the amount of sucrose per wheat graine0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stress significantly reduced the amount of sucrose per wheat grain”
Claim · model-written summary
Stress did not reduce the amount of sucrose per unit of wheat grain dry matter or water content.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Stresse0
- Outcome
- the amount of sucrose per unit of grain dry matter or water contente0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stress significantly reduced the amount of sucrose per wheat grain but not the amount of sucrose per unit of grain dry matter or water content”
Claim · model-written summary
In barley grains, stress did not reduce the relative or absolute sucrose contents.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- stresse0
- Outcome
- relative or absolute sucrose contentse0
- Direction
- did not reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In barley grains, stress did not reduce the relative or absolute sucrose contents”
Claim · model-written summary
Maturing grains eventually lost water and endosperm volume declined, with the water loss occurring earlier in stressed plants.
Not reportedTaxonComparator
Verbatim
e0“This water loss occurred earlier in stressed plants”
e1“water deficit after anthesis”
Claim · model-written summary
Protein as a proportion of grain dry weight was higher in stressed plants than in controls.
- Treatment
- stressede0
- Outcome
- protein as a proportion of grain dry weighte0
- Direction
- highere0
- Comparator
- controlse0
Not reportedTaxon
Verbatim
e0“protein as a proportion of grain dry weight was higher in stressed plants than in controls”
Claim · model-written summary
Protein and amino acid content per grain were unaffected by water deficit.
Not reportedTaxonComparator
Verbatim
e0“protein and amino acid content per grain were unaffected by water deficit”
Claim · model-written summary
The authors considered it unlikely that the earlier cessation of grain growth on stressed plants was caused by insufficient assimilate.
Not reportedTaxon
Verbatim
e0“It was considered unlikely that the earlier cessation of grain growth on stressed plants was caused by insufficient assimilate”
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