Abstract
Drought is a devastating environmental constraint affecting the agronomic production of barley. To facilitate the breeding process, abundant germplasm resources and reliable evaluation systems to identify the true drought-tolerant barley genotypes are needed. In this study, 237 cultivated and 190 wild barley genotypes, originating from 28 countries, were screened for drought tolerance under the conditions of both water deficit and polyethylene glycol (PEG)-simulated drought at seedling stage. Drought stress significantly reduced the plant growth of all barley genotypes, but no significant difference in drought-induced reduction in the performance of barley seedlings was observed under these two drought conditions. Both cultivated and wild barley subspecies displayed considerable genotypic variability in drought tolerance, which underpinned the identification of 18 genotypes contrasting in drought tolerance. A comparative analysis of drought effects on biomass, water relation, photosynthesis, and osmotic adjustment was undertaken using these contrasting barley genotypes, in order to verify the reliability of the screening and to obtain the credible traits as screening criteria of drought tolerance in barley. As expected, the selected drought-tolerant genotypes showed much less reduction in shoot biomass than drought-sensitive ones under water deficit, which was significantly positively correlated with the results of large-scale screening, confirming the reliability of the screening for drought tolerance under two drought conditions in this study. Likewise, the traits of water relation, photosynthetic activity, and osmotic adjustment differed greatly between the contrasting genotypes under water deficit stress, and they were highly correlated to the growth of barley seedlings, suggesting the potential of them to be the selection criteria for drought tolerance. The analysis of the variable importance of these traits in drought tolerance indicated that sap osmolality and relative water content in the youngest fully-expanded leaf are the suitable selection criteria of screening for drought tolerance in barley at seedling stage.
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Claims 10
Claim · model-written summary
Drought significantly reduced growth across barley genotypes.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- Drought stresse0
- Outcome
- plant growthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Drought stress significantly reduced the plant growth of all barley genotypes”
Claim · model-written summary
The two drought conditions did not differ significantly in seedling performance reduction.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- these two drought conditionse0
- Outcome
- performance of barley seedlingse0
- Direction
- no significant differencee0
- Comparator
- these two drought conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant difference in drought-induced reduction in the performance of barley seedlings was observed under these two drought conditions”
Claim · model-written summary
Cultivated and wild barley varied considerably in drought tolerance.
- Taxon
- barleyHordeum vulgaree0
- Material
- cultivated and wild barley subspeciese0
- Outcome
- genotypic variability in drought tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both cultivated and wild barley subspecies displayed considerable genotypic variability in drought tolerance”
Claim · model-written summary
Screening identified 18 genotypes with contrasting drought tolerance.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- genotypes contrasting in drought tolerancee0
- Value
- 18e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“identification of 18 genotypes contrasting in drought tolerance”
t0“Barley”
Claim · model-written summary
Tolerant genotypes had less shoot biomass reduction than sensitive ones under water deficit.
- Taxon
- barleyHordeum vulgaret0
- Material
- drought-tolerant genotypese0
- Treatment
- water deficite0
- Outcome
- shoot biomasse0
- Direction
- much less reductione0
- Comparator
- drought-sensitive onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought-tolerant genotypes showed much less reduction in shoot biomass than drought-sensitive ones under water deficit”
t0“Barley”
Claim · model-written summary
Shoot biomass findings correlated positively with the large-scale screen.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- results of large-scale screeninge0
- Direction
- positively correlatede0
- Comparator
- large-scale screeninge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which was significantly positively correlated with the results of large-scale screening”
t0“Barley”
Claim · model-written summary
Water relations, photosynthesis, and osmotic adjustment differed between contrasting genotypes.
- Taxon
- barleyHordeum vulgaret0
- Material
- contrasting genotypese0
- Treatment
- water deficit stresse0
- Outcome
- water relation, photosynthetic activity, and osmotic adjustmente0
- Direction
- differed greatlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the traits of water relation, photosynthetic activity, and osmotic adjustment differed greatly between the contrasting genotypes under water deficit stress”
t0“Barley”
Claim · model-written summary
Those physiological traits correlated highly with barley seedling growth.
- Taxon
- barleyHordeum vulgaree0
- Organ / stage
- seedlingse0
- Outcome
- growth of barley seedlingse0
- Direction
- highly correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they were highly correlated to the growth of barley seedlings”
Claim · model-written summary
Sap osmolality was identified as a suitable drought-screening criterion.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- sap osmolalitye0
- Qualifier
- suitable selection criteriae0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sap osmolality and relative water content in the youngest fully-expanded leaf are the suitable selection criteria of screening for drought tolerance in barley at seedling stage”
Claim · model-written summary
Youngest fully expanded leaf relative water content was identified as a suitable drought-screening criterion.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- relative water content in the youngest fully-expanded leafe0
- Qualifier
- suitable selection criteriae0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sap osmolality and relative water content in the youngest fully-expanded leaf are the suitable selection criteria of screening for drought tolerance in barley at seedling stage”
The same questions in other papers
drought · growth · Hordeum vulgare (barley)Positive and negative results
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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.