Abstract
The aim of this study was to investigate whether there was a relationship between growth of sunflower seedlings at 15°C in the dark and activities of enzymes involved in scavenging of reactive oxygen species (ROS), especially superoxide dismutase (SOD), catalase (CAT) and glutathione reductase (GR), or in production of free radicals, namely lipoxygenase (LOX). Untreated control seeds were compared with seeds exposed to accelerated ageing (5 d at 45°C and 100% relative humidity), osmopriming (7 d at 15°C with a polyethylene glycol (PEG) solution at –2 MPa) and accelerated ageing followed by priming. Accelerated ageing decreased seed germinability and slowed down hypocotyl growth, whereas priming resulted in an increase in germination rate and enhanced seedling development. Osmopriming of aged seeds almost completely restored the initial rate of germination and seedling growth. The activity of all the enzymes studied increased during seed germination and seedling development, except that of SOD. Seed imbibition or radicle protrusion were related mainly with an increase in CAT activity and, to a lesser extent, in GR activity. Increase of LOX activity was clearly associated with the onset of hypocotyl elongation. However, in all cases, malondialdehyde measurements did not reveal intense lipid peroxidation. Priming induced a marked stimulation of CAT and GR during seed imbibition or very early during seedling development, as compared to the control seedlings and particularly to the seedlings generated by aged seeds. Hydrogen peroxide (H 2 O 2 ) contents of seeds and seedlings were closely correlated to the activities of CAT and GR and to the kinetics of seedling development. The results obtained establish a clear relationship between sunflower seed vigour and ROS scavenging.
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Claims 11
Claim · model-written summary
Accelerated ageing decreased seed germinability.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- Accelerated ageinge0
- Outcome
- seed germinabilitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower seedlings”
e0“Accelerated ageing decreased seed germinability”
Claim · model-written summary
Accelerated ageing slowed hypocotyl growth.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Accelerated ageinge0
- Outcome
- hypocotyl growthe0
- Direction
- slowed downe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower seedlings”
e0“Accelerated ageing decreased seed germinability and slowed down hypocotyl growth”
Claim · model-written summary
Priming increased germination rate and enhanced seedling development.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- priminge0
- Outcome
- germination rate and enhanced seedling developmente0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower seedlings”
e0“priming resulted in an increase in germination rate and enhanced seedling development”
Claim · model-written summary
Osmopriming of aged seeds almost completely restored initial germination rate and seedling growth.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Osmopriming of aged seedse0
- Outcome
- rate of germination and seedling growthe0
- Direction
- restorede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower seedlings”
e0“Osmopriming of aged seeds almost completely restored the initial rate of germination and seedling growth”
Claim · model-written summary
All studied enzyme activities except SOD increased during germination and development.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- seed germination and seedling developmente0
- Outcome
- activity of all the enzymes studiede0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower seedlings”
e0“The activity of all the enzymes studied increased during seed germination and seedling development, except that of SOD”
Claim · model-written summary
Seed imbibition or radicle protrusion was associated mainly with increased CAT activity.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- Seed imbibition or radicle protrusione0
- Gene
- CATe0
- Outcome
- CAT activitye0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower seedlings”
e0“Seed imbibition or radicle protrusion were related mainly with an increase in CAT activity”
Claim · model-written summary
Seed imbibition or radicle protrusion was associated to a lesser extent with increased GR activity.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- Seed imbibition or radicle protrusione0
- Gene
- GRe0
- Outcome
- GR activitye0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower seedlings”
e0“Seed imbibition or radicle protrusion were related mainly with an increase in CAT activity and, to a lesser extent, in GR activity”
Claim · model-written summary
LOX activity increased with onset of hypocotyl elongation.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- onset of hypocotyl elongatione0
- Gene
- LOXe0
- Outcome
- LOX activitye0
- Direction
- Increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower seedlings”
e0“Increase of LOX activity was clearly associated with the onset of hypocotyl elongation”
Claim · model-written summary
Malondialdehyde measurements did not show intense lipid peroxidation.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- lipid peroxidatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower seedlings”
e0“malondialdehyde measurements did not reveal intense lipid peroxidation”
Claim · model-written summary
Priming markedly stimulated CAT and GR during imbibition or early seedling development against controls and aged seedlings.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Priminge0
- Outcome
- CAT and GRe0
- Direction
- stimulatione0
- Comparator
- control seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower seedlings”
e0“Priming induced a marked stimulation of CAT and GR during seed imbibition or very early during seedling development, as compared to the control seedlings and particularly to the seedlings generated by aged seeds”
Claim · model-written summary
Hydrogen peroxide contents correlated closely with CAT and GR activities and seedling development kinetics.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- seeds and seedlingse0
- Gene
- CAT and GRe0
- Outcome
- Hydrogen peroxide (H 2 O 2 ) contentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower seedlings”
e0“Hydrogen peroxide (H 2 O 2 ) contents of seeds and seedlings were closely correlated to the activities of CAT and GR and to the kinetics of seedling development”
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See all 14 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.