Abstract
Abstract The physiological performance of some sunflower genotypes (S.28111, SF0049, Hysun-33, Hysun-39) under salt, drought stress separately and in combination was examined. Salt, drought and a combination of these stresses were applied to plants by gradual increments. The plants were exposed to stress for two weeks. Relative water content, osmotic potential, stomatal conductance, performance index, dark adapted quantum yield and chlorophyll contents were reduced upon salinity and drought stresses. However, when plants were subjected to a combination of these stresses, a greater reduction in all tested attributes was observed. Proline and carotenoid contents in drought stress were elevated compared to salt stress. Superoxide dismutase (SOD) and catalase (CAT) showed the highest activity in individual salt and drought stress with less accumulation of H 2 O 2 . Combined stress reduced the activity of antioxidant enzymes which ultimately decreased the physiological performance of sunflower plants. However, among the tested genotypes, S.28111 and SF0049 were found to be more tolerant to drought, salt and combined stress than both Hysun genotypes. The physiological performance of genotypes against salinity and drought individually and in combination is discussed in detail.
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Claims 9
Claim · model-written summary
Salt and drought reduced water status, gas exchange, photosynthetic performance and chlorophyll.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- salinity and drought stressese0
- Outcome
- Relative water content, osmotic potential, stomatal conductancee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative water content, osmotic potential, stomatal conductance, performance index, dark adapted quantum yield and chlorophyll contents were reduced upon salinity and drought stresses.”
t0“sunflower genotypes”
Claim · model-written summary
Salt and drought reduced performance index, quantum yield and chlorophyll.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- salinity and drought stressese0
- Outcome
- performance index, dark adapted quantum yield and chlorophyll contentse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative water content, osmotic potential, stomatal conductance, performance index, dark adapted quantum yield and chlorophyll contents were reduced upon salinity and drought stresses.”
t0“sunflower genotypes”
Claim · model-written summary
Combined stress caused greater reductions in all tested attributes.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- a combination of these stressese0
- Outcome
- all tested attributese0
- Direction
- greater reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when plants were subjected to a combination of these stresses, a greater reduction in all tested attributes was observed.”
t0“sunflower genotypes”
Claim · model-written summary
Drought gave higher proline and carotenoid contents than salt stress.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- drought stresse0
- Outcome
- Proline and carotenoid contentse0
- Direction
- elevatede0
- Comparator
- salt stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proline and carotenoid contents in drought stress were elevated compared to salt stress.”
t0“sunflower genotypes”
Claim · model-written summary
Individual salt and drought stresses gave highest SOD and CAT activities.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- individual salt and drought stresse0
- Gene
- Superoxide dismutase (SOD) and catalase (CAT)e0
- Outcome
- Superoxide dismutase (SOD) and catalase (CAT)e0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Superoxide dismutase (SOD) and catalase (CAT) showed the highest activity in individual salt and drought stress with less accumulation of H 2 O 2 .”
t0“sunflower genotypes”
Claim · model-written summary
Individual stress had less hydrogen-peroxide accumulation.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- individual salt and drought stresse0
- Outcome
- accumulation of H 2 O 2e0
- Direction
- lesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Superoxide dismutase (SOD) and catalase (CAT) showed the highest activity in individual salt and drought stress with less accumulation of H 2 O 2 .”
t0“sunflower genotypes”
Claim · model-written summary
Combined stress reduced antioxidant enzyme activity and physiological performance.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- Combined stresse0
- Outcome
- activity of antioxidant enzymese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combined stress reduced the activity of antioxidant enzymes which ultimately decreased the physiological performance of sunflower plants.”
Claim · model-written summary
Combined stress decreased sunflower physiological performance.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- Combined stresse0
- Outcome
- physiological performancee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combined stress reduced the activity of antioxidant enzymes which ultimately decreased the physiological performance of sunflower plants.”
Claim · model-written summary
S.28111 and SF0049 were more tolerant than the Hysun genotypes.
- Taxon
- sunflowerHelianthus annuust0
- Material
- S.28111 and SF0049e0
- Outcome
- tolerant to drought, salt and combined stresse0
- Direction
- more tolerante0
- Comparator
- Hysun genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“among the tested genotypes, S.28111 and SF0049 were found to be more tolerant to drought, salt and combined stress than both Hysun genotypes.”
t0“sunflower genotypes”
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See all 6 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.