Abstract
Average barley yield fall below its potential due to incidence of stresses. Water stress is the main environmental factor limiting yield. The component a priori more sensitive to most stresses is the amount of radiation absorbed. The effect of stresses influence on the total amount of radiation absorbed by barley crop during its vegetation and the photosynthetic efficiency of radiation conversion. Growth inhibition is accompanied by reductions in leaf and cell wall extensibility. Grain yield under drought conditions is source limited. Supply of assimilates to the developing inflorescence plays a critical role in establishing final grain number and grain size. Grain weight is negatively affected by drought, high temperature, and any other factors that may reduce grain filling duration and grain filling rate. Awns and glaucousness confer better performance of barley under drought stress conditions. Barley responds with an increased accumulation of a number of proteins when subjected to different stress inducing cell dehydration. Screening techniques that are able to identify desirable genotypes based on the evaluation of physiological traits related to stress evasion and stress resistance maybe useful in breeding barley for resistance to stress, particularly drought stress. Crop management and breeding can reduce the incidence of stress on yield. The effect of these practices is sustained by an understanding of their physiology. In this paper the physiological basis of the processes determining barley yield and the incidence of stresses on photosynthetic metabolism that determine grain yield of barley is discussed. .
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Claims 12
Claim · model-written summary
Water stress is the main environmental limitation on barley yield.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- Water stresse0
- Outcome
- yielde0
- Direction
- limitinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Water stress is the main environmental factor limiting yield”
t0“barley”
Claim · model-written summary
Stress affects absorbed radiation and photosynthetic conversion efficiency in barley.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- stressese0
- Outcome
- total amount of radiation absorbede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stresses influence on the total amount of radiation absorbed by barley crop during its vegetation and the photosynthetic efficiency of radiation conversion”
Claim · model-written summary
Growth inhibition accompanies reduced leaf and cell wall extensibility.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- leaf and cell walle0
- Outcome
- leaf and cell wall extensibilitye0
- Direction
- reductionse0
- Qualifier
- Growth inhibitione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth inhibition is accompanied by reductions in leaf and cell wall extensibility”
t0“barley”
Claim · model-written summary
Barley grain yield under drought is source limited.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- drought conditionse0
- Outcome
- Grain yielde0
- Qualifier
- source limitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield under drought conditions is source limited”
t0“barley”
Claim · model-written summary
Assimilate supply to the developing inflorescence affects final grain number and size.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- developing inflorescencee0
- Outcome
- final grain number and grain sizee0
- Qualifier
- Supply of assimilatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Supply of assimilates to the developing inflorescence plays a critical role in establishing final grain number and grain size”
t0“barley”
Claim · model-written summary
Drought negatively affects barley grain weight.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- droughte0
- Outcome
- Grain weighte0
- Direction
- negatively affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain weight is negatively affected by drought, high temperature, and any other factors that may reduce grain filling duration and grain filling rate”
t0“barley”
Claim · model-written summary
High temperature negatively affects barley grain weight.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- high temperaturee0
- Outcome
- Grain weighte0
- Direction
- negatively affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain weight is negatively affected by drought, high temperature, and any other factors that may reduce grain filling duration and grain filling rate”
t0“barley”
Claim · model-written summary
Awns improve barley performance under drought.
- Taxon
- barleyHordeum vulgaree0
- Material
- Awnse0
- Treatment
- drought stress conditionse0
- Outcome
- better performancee0
- Direction
- bettere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Awns and glaucousness confer better performance of barley under drought stress conditions”
Claim · model-written summary
Glaucousness improves barley performance under drought.
- Taxon
- barleyHordeum vulgaree0
- Material
- glaucousnesse0
- Treatment
- drought stress conditionse0
- Outcome
- better performancee0
- Direction
- bettere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Awns and glaucousness confer better performance of barley under drought stress conditions”
Claim · model-written summary
Cell dehydration stress increases accumulation of proteins in barley.
- Taxon
- BarleyHordeum vulgaree0
- Treatment
- stress inducing cell dehydratione0
- Outcome
- accumulation of a number of proteinse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Barley responds with an increased accumulation of a number of proteins when subjected to different stress inducing cell dehydration”
Claim · model-written summary
Physiological trait screening may help identify barley genotypes resistant to stress.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- Screening techniquese0
- Qualifier
- resistance to stress, particularly drought stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Screening techniques that are able to identify desirable genotypes based on the evaluation of physiological traits related to stress evasion and stress resistance maybe useful in breeding barley for resistance to stress, particularly drought stress”
Claim · model-written summary
Crop management and breeding can reduce stress impacts on barley yield.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- Crop management and breedinge0
- Qualifier
- reduce the incidence of stress on yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop management and breeding can reduce the incidence of stress on yield”
t0“barley”