Abstract
Physiological traits and productivity of the recombinant chromosome substitution lines ( RCSLs ) of barley, developed through the cross of Hordeum vulgare ssp. v ulgare cv. Harrington and the wild ancestor Hordeum vulgare ssp. spontaneum , were measured in plants growing in microplots (with and without irrigation) and in field conditions in two M editerranean‐type environments, C auquenes (rainfed) and S anta R osa (irrigated). The objectives were to assess the degree of phenotypic variability in response to terminal drought stress and to test whether the introgression of the wild ancestor into cv. Harrington can increase the terminal drought tolerance of RCSLs of barley. Days from emergence to anthesis and from anthesis to maturity of the 80 RCSLs were reduced in only 2–4 days under water stress, in microplots. Specific leaf area ( SLA ) and stomatal conductance ( gs ) of 80 RCSLs and cv. Harrington decreased greatly under water stress in plants growing in microplots and field conditions (in 2004/05 growing season). No G × E interaction was detected except for SLA in the microplot experiment. The principal component analysis provided a clear distinction between RCSLs . Along the first principal component, it was possible to identify 24 RCSLs which represent the whole range of grain yield ( GY ), gs and SLA observed in the 80 RCSLs . The selected 24 RCSLs were evaluated in field conditions at C auquenes and S anta R osa, during two growing seasons (2007/08 and 2008/09). The gs and carbon isotope discrimination in grains (Δ 13 C ) were significantly ( P < 0.001) lower in the rainfed condition ( C auquenes), but the water‐soluble carbohydrates ( WSC ) in stems at anthesis and maturity was significantly ( P < 0.001) higher than in well‐irrigated condition ( S anta R osa). Grain yield was reduced by 63% under drought conditions. Differences between RCSLs in gs, WSC and GY were significant ( P < 0.001) in 2007/08. The stress tolerance index ( STI ) was highly ( P < 0.01) correlated with GY in all environments (rainfed and irrigated conditions and the two growing seasons). The relationship between STI and Δ 13 C under rainfed condition allowed identifying drought tolerant and susceptible RCSLs ; the former were high yielding lines under rainfed and irrigated conditions (and higher STI values), but with similar GY to cv. Harrington, but presented higher grain Δ 13 C values than cv. Harrington. The drought susceptible lines presented lower GY , STI and Δ 13 C values than cv. Harrington. These results suggest that H. spontaneum has contributed alleles that increase terminal drought tolerance to some of the RCSLs .
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Claims 18
Claim · model-written summary
Water stress shortened emergence-to-anthesis and anthesis-to-maturity intervals by 2–4 days.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Material
- RCSLse0
- Treatment
- water stresse0
- Outcome
- Days from emergence to anthesis and from anthesis to maturitye0
- Direction
- reducede0
- Value
- 2–4 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Days from emergence to anthesis and from anthesis to maturity of the 80 RCSLs were reduced in only 2–4 days under water stress”
e1“RCSLs ) of barley”
Claim · model-written summary
Specific leaf area decreased under water stress.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- water stresse0
- Outcome
- Specific leaf areae0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Specific leaf area ( SLA ) and stomatal conductance ( gs ) of 80 RCSLs and cv. Harrington decreased greatly under water stress”
e1“RCSLs ) of barley”
Claim · model-written summary
Stomatal conductance decreased under water stress.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- water stresse0
- Outcome
- stomatal conductancee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Specific leaf area ( SLA ) and stomatal conductance ( gs ) of 80 RCSLs and cv. Harrington decreased greatly under water stress”
e1“RCSLs ) of barley”
Claim · model-written summary
Genotype-by-environment interaction was detected only for specific leaf area in microplots.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- G × E interactione0
- Qualifier
- except for SLA in the microplot experimente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No G × E interaction was detected except for SLA in the microplot experiment”
e1“RCSLs ) of barley”
Claim · model-written summary
Principal component analysis distinguished the barley substitution lines.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- clear distinction between RCSLse0
- Comparator
- RCSLse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“principal component analysis provided a clear distinction between RCSLs”
e1“RCSLs ) of barley”
Claim · model-written summary
The first component identified 24 lines spanning the observed range of yield, conductance and leaf area.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- whole range of grain yield ( GY ), gs and SLAe0
- Value
- 24 RCSLse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“identify 24 RCSLs which represent the whole range of grain yield ( GY ), gs and SLA observed in the 80 RCSLs”
e1“RCSLs ) of barley”
Claim · model-written summary
Rainfed conditions lowered stomatal conductance relative to irrigated conditions.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- rainfed conditione0
- Outcome
- gse0
- Direction
- lowere0
- Setting
- C auquenese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“gs and carbon isotope discrimination in grains (Δ 13 C ) were significantly ( P < 0.001) lower in the rainfed condition ( C auquenes)”
e1“RCSLs ) of barley”
Claim · model-written summary
Rainfed conditions lowered grain carbon isotope discrimination.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- rainfed conditione0
- Outcome
- carbon isotope discrimination in grainse0
- Direction
- lowere0
- Setting
- C auquenese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“gs and carbon isotope discrimination in grains (Δ 13 C ) were significantly ( P < 0.001) lower in the rainfed condition ( C auquenes)”
e1“RCSLs ) of barley”
Claim · model-written summary
Rainfed conditions increased stem water-soluble carbohydrates at anthesis and maturity.
- Taxon
- barleyHordeum vulgaree2
- Treatment
- rainfed conditione1
- Outcome
- water‐soluble carbohydrates ( WSC ) in stems at anthesis and maturitye0
- Direction
- highere0
- Comparator
- well‐irrigated conditione0
- Setting
- S anta R osae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water‐soluble carbohydrates ( WSC ) in stems at anthesis and maturity was significantly ( P < 0.001) higher than in well‐irrigated condition ( S anta R osa)”
e1“rainfed condition ( C auquenes)”
e2“RCSLs ) of barley”
Claim · model-written summary
Drought reduced grain yield by 63%.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- drought conditionse0
- Outcome
- Grain yielde0
- Direction
- reducede0
- Value
- 63%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield was reduced by 63% under drought conditions”
e1“RCSLs ) of barley”
Claim · model-written summary
Substitution lines differed significantly in conductance, carbohydrates and yield in 2007/08.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- Differences between RCSLs in gs, WSC and GYe0
- Qualifier
- 2007/08e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences between RCSLs in gs, WSC and GY were significant ( P < 0.001) in 2007/08”
e1“RCSLs ) of barley”
Claim · model-written summary
Stress tolerance index correlated strongly with grain yield across environments.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- GYe0
- Qualifier
- all environmentse0
- Comparator
- STIe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stress tolerance index ( STI ) was highly ( P < 0.01) correlated with GY in all environments”
e1“RCSLs ) of barley”
Claim · model-written summary
The index and carbon isotope discrimination identified drought-tolerant and susceptible lines.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- identifying drought tolerant and susceptible RCSLse0
- Comparator
- STI and Δ 13 Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“relationship between STI and Δ 13 C under rainfed condition allowed identifying drought tolerant and susceptible RCSLs”
e1“RCSLs ) of barley”
Claim · model-written summary
Drought-tolerant lines yielded highly in both rainfed and irrigated conditions and had higher index values.
- Taxon
- barleyHordeum vulgaree2
- Material
- RCSLse1
- Outcome
- high yielding linese0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the former were high yielding lines under rainfed and irrigated conditions (and higher STI values)”
e1“drought tolerant and susceptible RCSLs”
e2“RCSLs ) of barley”
Claim · model-written summary
Drought-tolerant lines had similar yield to Harrington.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“similar GY to cv. Harrington”
e1“drought tolerant and susceptible RCSLs”
e2“RCSLs ) of barley”
Claim · model-written summary
Drought-tolerant lines had higher grain carbon isotope discrimination than Harrington.
- Taxon
- barleyHordeum vulgaree2
- Material
- RCSLse1
- Outcome
- grain Δ 13 C valuese0
- Direction
- highere0
- Comparator
- cv. Harringtone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher grain Δ 13 C values than cv. Harrington”
e1“drought tolerant and susceptible RCSLs”
e2“RCSLs ) of barley”
Claim · model-written summary
Drought-susceptible lines had lower yield, index and carbon isotope discrimination than Harrington.
- Taxon
- barleyHordeum vulgaree1
- Material
- drought susceptible linese0
- Outcome
- GY , STI and Δ 13 C valuese0
- Direction
- lowere0
- Comparator
- cv. Harringtone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought susceptible lines presented lower GY , STI and Δ 13 C values than cv. Harrington”
e1“RCSLs ) of barley”
Claim · model-written summary
Wild barley alleles may have increased drought tolerance in some lines.
- Taxon
- barleyHordeum vulgaree1
- Gene
- allelese0
- Outcome
- terminal drought tolerancee0
- Qualifier
- some of the RCSLse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H. spontaneum has contributed alleles that increase terminal drought tolerance to some of the RCSLs”
e1“RCSLs ) of barley”
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