Abstract
Abstract Abstract: Understanding plant responses to drought stress is essential, and there is a need to know possible physiological mechanisms of damage and drought avoidance for the genetic improvement of crops. Therefore, we investigated the effects of silicon (Si) on shoot and root growth, leaf relative water content (RWC), stomatal resistance (SR), lipid peroxidation (MDA), membrane permeability (MP), proline and hydrogen peroxide (H2O2) accumulation, nonenzymatic antioxidant activity, and the activities of superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX) of 12 sunflower cultivars grown under drought conditions. Silicon applied to the soil counteracted the deleterious effects of drought in 6 of the 12 sunflower cultivars. In general, SR and H2O2, proline, and MDA content were increased in all the cultivars under drought stress. However, application of Si decreased their levels and alleviated membrane damage (MP) significantly by increasing leaf RWC. The CAT activity was significantly decreased by drought stress, but supplemental Si increased it. In general, SOD and APX activities of the cultivars were increased by drought and decreased by application of Si. The nonenzymatic antioxidant activity of the cultivars was significantly increased by Si under drought stress. Based on the present work, it can be concluded that applied Si alleviates drought stress in sunflower cultivars by preventing membrane damage, although the cultivars showed genotypic variation in response to applied Si. Keywords: Antioxidant enzymesdroughtlipid peroxidationstomatal resistancesunflower ACKNOWLEDGMENT We gratefully acknowledge Ankara University, Scientific Research Fund (BAP, Project No. 20030711074) and TUBIAK (Project No. 104 O 477) for supporting the work.
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Claims 13
Claim · model-written summary
Soil silicon counteracted drought damage in 6 of 12 sunflower cultivars.
- Taxon
- sunflower
Helianthus annuuse0 - Treatment
- Silicon applied to the soile0
- Outcome
- deleterious effects of droughte0
- Direction
- counteractede0
- Value
- 6 of the 12 sunflower cultivarse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Silicon applied to the soil counteracted the deleterious effects of drought in 6 of the 12 sunflower cultivars”
Claim · model-written summary
Drought increased stomatal resistance in all cultivars.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- drought stresse0
- Outcome
- SRe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In general, SR and H2O2, proline, and MDA content were increased in all the cultivars under drought stress”
t0“Sunflower”
Claim · model-written summary
Drought increased hydrogen peroxide, proline and MDA contents in all cultivars.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- drought stresse0
- Outcome
- H2O2, proline, and MDA contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In general, SR and H2O2, proline, and MDA content were increased in all the cultivars under drought stress”
t0“Sunflower”
Claim · model-written summary
Silicon decreased stomatal resistance under drought.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- application of Sie0
- Outcome
- SRe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In general, SR and H2O2, proline, and MDA content were increased in all the cultivars under drought stress. However, application of Si decreased their levels and alleviated membrane damage (MP) significantly by increasing leaf RWC”
t0“Sunflower”
Claim · model-written summary
Silicon decreased hydrogen peroxide, proline and MDA levels under drought.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- application of Sie0
- Outcome
- H2O2, proline, and MDA contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In general, SR and H2O2, proline, and MDA content were increased in all the cultivars under drought stress. However, application of Si decreased their levels and alleviated membrane damage (MP) significantly by increasing leaf RWC”
t0“Sunflower”
Claim · model-written summary
Silicon significantly alleviated membrane damage under drought.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- application of Sie0
- Outcome
- membrane damage (MP)e0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of Si decreased their levels and alleviated membrane damage (MP) significantly by increasing leaf RWC”
t0“Sunflower”
Claim · model-written summary
Silicon increased leaf relative water content under drought.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- application of Sie0
- Outcome
- leaf RWCe0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of Si decreased their levels and alleviated membrane damage (MP) significantly by increasing leaf RWC”
t0“Sunflower”
Claim · model-written summary
Drought significantly decreased catalase activity.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- drought stresse0
- Outcome
- CAT activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CAT activity was significantly decreased by drought stress”
t0“Sunflower”
Claim · model-written summary
Supplemental silicon increased catalase activity.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- supplemental Sie0
- Outcome
- CAT activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CAT activity was significantly decreased by drought stress, but supplemental Si increased it”
t0“Sunflower”
Claim · model-written summary
Drought increased superoxide dismutase and ascorbate peroxidase activities.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- droughte0
- Outcome
- SOD and APX activitiese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In general, SOD and APX activities of the cultivars were increased by drought”
t0“Sunflower”
Claim · model-written summary
Silicon decreased superoxide dismutase and ascorbate peroxidase activities.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- application of Sie0
- Outcome
- SOD and APX activitiese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SOD and APX activities of the cultivars were increased by drought and decreased by application of Si”
t0“Sunflower”
Claim · model-written summary
Silicon significantly increased nonenzymatic antioxidant activity under drought.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- Sie0
- Outcome
- nonenzymatic antioxidant activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nonenzymatic antioxidant activity of the cultivars was significantly increased by Si under drought stress”
t0“Sunflower”
Claim · model-written summary
Sunflower cultivars varied in response to applied silicon.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- genotypic variation in response to applied Sie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the cultivars showed genotypic variation in response to applied Si”
t0“sunflower”
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See all 5 papers →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.