Abstract
Response of sunflower germplasms viz. cultivated sunflower H. annuus and two breeding lines H. annuus x T. rotundifolia and H. annuus x V. encelioides developed after wide hybridization were used for identification of drought tolerant sunflower genotypes at the seedling growth stage. Three water stress levels of zero (control), -0.4, and -0.8 MPa were developed using polyethyleneglycol-6000 (PEG-6000). Physiological and biochemical stress determining parameters such as root and shoots length, fresh weight, antioxidant enzyme activities (superoxide dismutase (SOD), catalase (CAT), guaiacol peroxidase (GPO), ascorbate peroxidase (APX) and antioxidant metabolite content (total antioxidant capacity, total phenols and total flavonoids content) were compared between seedlings of all three genotypes. Results revealed that sunflower genotypes have similar responses at two osmotic potentials for shoot and root length and fresh weight. The data also showed that drought stresss could induce oxidative stress, as indicated by the increase level of ascorbate peroxidase and guaiacol peroxidase at -04 MPa in H. annuus cv 1114. Although the activity of ascorbate peroxidase and guaiacol peroxidase was differentially influenced by drought, the changes of antioxidant enzyme activities such as catalase, superoxide dismutase, guaiacol peroxidase, and ascorbate peroxidase subjected to drought stress follow a similar pattern in both breeding lines, indicating that similar defense systems might be involved in the oxidative stress injury in sunflowers. Increase in content of phenols and flavonoids were detected for all three genotypes under stress, which showed that these were major antioxidant metabolites in scavenging cellular H2O2.
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Claims 6
Claim · model-written summary
Sunflower genotypes had similar responses at two osmotic potentials for shoot and root length and fresh weight.
- Taxon
- sunflower
Helianthus annuuse1 - Material
- sunflower genotypese1
- Outcome
- shoot and root length and fresh weighte1
- Direction
- similare1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Results revealed that sunflower genotypes have similar responses at two osmotic potentials for shoot and root length and fresh weight”
Claim · model-written summary
Drought at -0.4 MPa increased ascorbate peroxidase and guaiacol peroxidase activity in H. annuus cv 1114, indicating oxidative stress.
- Taxon
- sunflowerHelianthus annuuse1
- Material
- H. annuus cv 1114e2
- Treatment
- -04 MPae2
- Outcome
- ascorbate peroxidase and guaiacol peroxidasee2
- Direction
- increasee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Results revealed that sunflower genotypes have similar responses at two osmotic potentials for shoot and root length and fresh weight”
e2“The data also showed that drought stresss could induce oxidative stress, as indicated by the increase level of ascorbate peroxidase and guaiacol peroxidase at -04 MPa in H. annuus cv 1114”
Claim · model-written summary
Antioxidant enzyme activities followed a similar pattern under drought in both sunflower breeding lines.
- Taxon
- sunflowerHelianthus annuuse1
- Material
- both breeding linese4
- Treatment
- drought stresse4
- Outcome
- antioxidant enzyme activities such as catalase, superoxide dismutase, guaiacol peroxidase, and ascorbate peroxidasee4
- Direction
- similar patterne4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Results revealed that sunflower genotypes have similar responses at two osmotic potentials for shoot and root length and fresh weight”
e4“the changes of antioxidant enzyme activities such as catalase, superoxide dismutase, guaiacol peroxidase, and ascorbate peroxidase subjected to drought stress follow a similar pattern in both breeding lines”
Claim · model-written summary
Drought differentially influenced the activity of ascorbate peroxidase and guaiacol peroxidase in sunflower.
- Taxon
- sunflowerHelianthus annuuse1
- Treatment
- droughte5
- Outcome
- activity of ascorbate peroxidase and guaiacol peroxidasee5
- Direction
- differentially influencede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Results revealed that sunflower genotypes have similar responses at two osmotic potentials for shoot and root length and fresh weight”
e5“Although the activity of ascorbate peroxidase and guaiacol peroxidase was differentially influenced by drought”
Claim · model-written summary
Content of phenols and flavonoids increased under stress in all three sunflower genotypes.
- Taxon
- sunflowerHelianthus annuuse1
- Material
- all three genotypese3
- Treatment
- stresse3
- Outcome
- content of phenols and flavonoidse3
- Direction
- Increasee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Results revealed that sunflower genotypes have similar responses at two osmotic potentials for shoot and root length and fresh weight”
e3“Increase in content of phenols and flavonoids were detected for all three genotypes under stress”
Claim · model-written summary
Phenols and flavonoids were major antioxidant metabolites in scavenging cellular H2O2 in sunflower.
- Taxon
- sunflowerHelianthus annuuse1
- Compound
- phenols and flavonoidse3
- Outcome
- scavenging cellular H2O2e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Results revealed that sunflower genotypes have similar responses at two osmotic potentials for shoot and root length and fresh weight”
e3“Increase in content of phenols and flavonoids were detected for all three genotypes under stress”
e6“these were major antioxidant metabolites in scavenging cellular H2O2”