Abstract
The aim of this study was to determine the effect of drought stress on four sunflower genotypes (Tarsan, Sanbro, TR-3080 and DKF-2525) and the relationship between some physiological and phenological characters at 30% (drought stress) and 60% (well-watered) irrigation from soil water capacity. Stress treatment was started from the emergence until R1 stage (bud visible) under the controlled conditions of greenhouse. The results showed that plants responses in some parameters such as leaf, stem and total dry weight, total leaf area, young fully developed leaf area, plant height, WUE (water use efficiency), RWC (relative water content), SLW (specific leaf weight) and Delta13C isotope (carbon isotope discrimination) are gradually declined under drought stress condition. On the other hand, some responses such as to proline content and chlorophyll of leaves are increased at the same drought condition. The highly significant relationships were found between both WUE and Delta13C isotope and proline, especially under drought condition. Generally, sunflower genotypes with lower SLW (leaf thickness) showed higher water content than those with higher SLW mainly due to highly negative relationship with RWC, under drought stress condition. However, the Sanbro cultivar can be used as a parental genotype in sunflower breeding programs due to its high RWC, WUE, total dry weight, high proline accumulation and low Delta13C isotope under drought stress conditions. Our study suggested that selection for WUE using indirect Delta13C isotope can presumably be of great value in sunflower breeding programs aimed at developing drought tolerant genotypes. It can also be confirmed that measuring young fully developed leaf area can be enough to determine the leaf area because there is a close correlation between total leaf area and the young fully developed leaves on a plant in both normal and drought conditions.
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Claims 13
Claim · model-written summary
leaf, stem and total dry weight declined under drought stress in sunflower.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- drought stress conditione0
- Outcome
- leaf, stem and total dry weighte0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that plants responses in some parameters such as leaf, stem and total dry weight, total leaf area, young fully developed leaf area, plant height, WUE (water use efficiency), RWC (relative water content), SLW (specific leaf weight) and Delta13C isotope (carbon isotope discrimination) are gradually declined under drought stress condition.”
t0“sunflower”
Claim · model-written summary
total leaf area, young fully developed leaf area, plant height declined under drought stress in sunflower.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- drought stress conditione0
- Outcome
- total leaf area, young fully developed leaf area, plant heighte0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that plants responses in some parameters such as leaf, stem and total dry weight, total leaf area, young fully developed leaf area, plant height, WUE (water use efficiency), RWC (relative water content), SLW (specific leaf weight) and Delta13C isotope (carbon isotope discrimination) are gradually declined under drought stress condition.”
t0“sunflower”
Claim · model-written summary
WUE (water use efficiency), RWC (relative water content), SLW (specific leaf weight) declined under drought stress in sunflower.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- drought stress conditione0
- Outcome
- WUE (water use efficiency), RWC (relative water content), SLW (specific leaf weight)e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that plants responses in some parameters such as leaf, stem and total dry weight, total leaf area, young fully developed leaf area, plant height, WUE (water use efficiency), RWC (relative water content), SLW (specific leaf weight) and Delta13C isotope (carbon isotope discrimination) are gradually declined under drought stress condition.”
t0“sunflower”
Claim · model-written summary
Delta13C isotope (carbon isotope discrimination) declined under drought stress in sunflower.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- drought stress conditione0
- Outcome
- Delta13C isotope (carbon isotope discrimination)e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that plants responses in some parameters such as leaf, stem and total dry weight, total leaf area, young fully developed leaf area, plant height, WUE (water use efficiency), RWC (relative water content), SLW (specific leaf weight) and Delta13C isotope (carbon isotope discrimination) are gradually declined under drought stress condition.”
t0“sunflower”
Claim · model-written summary
Sunflower leaf proline content and chlorophyll increased under drought.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- drought conditione0
- Outcome
- proline content and chlorophyll of leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On the other hand, some responses such as to proline content and chlorophyll of leaves are increased at the same drought condition.”
t0“sunflower”
Claim · model-written summary
Sunflower WUE was highly significantly related to Delta13C isotope, especially under drought.
- Taxon
- sunflowerHelianthus annuust0
- Compound
- Delta13C isotopee0
- Outcome
- WUEe0
- Qualifier
- especially under drought conditione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highly significant relationships were found between both WUE and Delta13C isotope and proline, especially under drought condition.”
t0“sunflower”
Claim · model-written summary
Sunflower WUE was highly significantly related to proline, especially under drought.
- Taxon
- sunflowerHelianthus annuust0
- Compound
- prolinee0
- Outcome
- WUEe0
- Qualifier
- especially under drought conditione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highly significant relationships were found between both WUE and Delta13C isotope and proline, especially under drought condition.”
t0“sunflower”
Claim · model-written summary
Under drought, sunflower genotypes with lower SLW had higher water content than higher SLW genotypes.
- Taxon
- sunflowerHelianthus annuuse0
- Material
- sunflower genotypese0
- Outcome
- water contente0
- Direction
- highere0
- Qualifier
- under drought stress conditione0
- Comparator
- higher SLWe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Generally, sunflower genotypes with lower SLW (leaf thickness) showed higher water content than those with higher SLW mainly due to highly negative relationship with RWC, under drought stress condition.”
Claim · model-written summary
SLW and RWC had a highly negative relationship under drought.
- Taxon
- sunflowerHelianthus annuuse0
- Organ / stage
- leaf thicknesse0
- Outcome
- RWCe0
- Direction
- negativee0
- Qualifier
- under drought stress conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Generally, sunflower genotypes with lower SLW (leaf thickness) showed higher water content than those with higher SLW mainly due to highly negative relationship with RWC, under drought stress condition.”
Claim · model-written summary
Sanbro is proposed as a sunflower breeding parent based on its drought response traits.
- Taxon
- sunflowerHelianthus annuust0
- Material
- Sanbro cultivare0
- Outcome
- can be used as a parental genotype in sunflower breeding programse0
- Qualifier
- high RWC, WUE, total dry weight, high proline accumulation and low Delta13C isotope under drought stress conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, the Sanbro cultivar can be used as a parental genotype in sunflower breeding programs due to its high RWC, WUE, total dry weight, high proline accumulation and low Delta13C isotope under drought stress conditions.”
t0“sunflower”
Claim · model-written summary
The authors suggest indirect Delta13C isotope selection for WUE in drought tolerant sunflower breeding.
- Taxon
- sunflowerHelianthus annuuse0
- Outcome
- selection for WUE using indirect Delta13C isotopee0
- Qualifier
- can presumably be of great valuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our study suggested that selection for WUE using indirect Delta13C isotope can presumably be of great value in sunflower breeding programs aimed at developing drought tolerant genotypes.”
Claim · model-written summary
Young fully developed leaf area closely correlated with total leaf area in normal and drought conditions.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- young fully developed leavese0
- Outcome
- total leaf areae0
- Qualifier
- both normal and drought conditionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It can also be confirmed that measuring young fully developed leaf area can be enough to determine the leaf area because there is a close correlation between total leaf area and the young fully developed leaves on a plant in both normal and drought conditions.”
t0“sunflower”
Claim · model-written summary
The authors suggest measuring young fully developed leaf area to determine total leaf area.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- measuring young fully developed leaf area can be enough to determine the leaf areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It can also be confirmed that measuring young fully developed leaf area can be enough to determine the leaf area because there is a close correlation between total leaf area and the young fully developed leaves on a plant in both normal and drought conditions.”
t0“sunflower”
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