Abstract
Abstract: Seed vigor may be determinant for field performance, especially under water restriction conditions. Sunflower is a crop subject to these conditions in the field and, therefore, the aim of this study was to evaluate the physiological and antioxidant changes in sunflower seeds under water restriction. Two lots of sunflower seeds (cv. Hélio 253) with different vigor levels were used. After initial characterization, seeds were placed to germinate under water potentials of 0.0, -0.2, -0.4, -0.6 and -0.8 MPa and evaluated by tests of germination, first germination count, shoot length and primary root length. The activities of the antioxidant enzymes SOD, CAT, POX and APX were also evaluated at 0, 2, 4 and 6 days after sowing. Water restriction led to a decrease in germination and slower seedling growth, regardless of seed vigor level. SOD activity was similar in the two lots, with reduction in activity four days after sowing. CAT activity was affected differently during germination in the two lots, and it was generally higher in the most vigorous lot. In higher vigor seeds, there was lower POX activity in water restriction treatments compared to the control. In general, seeds of lower vigor have lower capacity for activation of antioxidant enzymes, especially peroxidases.
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Claims 7
Claim · model-written summary
Water restriction decreased germination regardless of vigor.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- Water restrictione0
- Outcome
- germinatione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water restriction led to a decrease in germination and slower seedling growth, regardless of seed vigor level”
t0“sunflower”
Claim · model-written summary
Water restriction slowed seedling growth regardless of vigor.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Water restrictione0
- Outcome
- seedling growthe0
- Direction
- slowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water restriction led to a decrease in germination and slower seedling growth, regardless of seed vigor level”
t0“sunflower”
Claim · model-written summary
SOD activity was similar in the two seed lots.
- Taxon
- sunflowerHelianthus annuust0
- Gene
- SODe0
- Outcome
- SOD activitye0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SOD activity was similar in the two lots”
t0“sunflower”
Claim · model-written summary
SOD activity declined four days after sowing.
- Taxon
- sunflowerHelianthus annuust0
- Gene
- SODe2
- Outcome
- activitye0
- Direction
- reductione0
- Qualifier
- four days after sowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduction in activity four days after sowing”
t0“sunflower”
e2“SOD activity was similar in the two lots”
Claim · model-written summary
CAT activity differed between lots during germination and was generally higher in the more vigorous lot.
- Taxon
- sunflowerHelianthus annuust0
- Material
- most vigorous lote0
- Gene
- CATe0
- Outcome
- CAT activitye0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CAT activity was affected differently during germination in the two lots, and it was generally higher in the most vigorous lot”
t0“sunflower”
Claim · model-written summary
Higher vigor seeds had lower POX activity under water restriction than controls.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- water restriction treatmentse0
- Gene
- POXe0
- Outcome
- POX activitye0
- Direction
- lowere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In higher vigor seeds, there was lower POX activity in water restriction treatments compared to the control”
t0“sunflower”
Claim · model-written summary
Lower vigor seeds generally had less capacity to activate antioxidant enzymes, especially peroxidases.
- Taxon
- sunflowerHelianthus annuust0
- Material
- seeds of lower vigore0
- Outcome
- capacity for activation of antioxidant enzymese0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seeds of lower vigor have lower capacity for activation of antioxidant enzymes, especially peroxidases”
t0“sunflower”
The same questions in other papers
drought · growth · Helianthus annuus (common sunflower)Results differ
49 papers in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
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See all 59 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.