Abstract
Activated oxygen species such as superoxide radicals, singlet oxygen, hydrogen peroxide and hydroxyl radicals can be produced in plants exposed to low, non‐freezing, non‐injurious temperatures. To prevent or alleviate oxidative injury, plants have evolved several mechanisms which include scavenging by natural antioxidants and enzymatic antioxidant systems such as superoxide dismutases, catalase and peroxidases. Although overproduction of hydrogen peroxide and increased tolerance to oxidative stress can be induced in wheat by low‐temperature treatments, data concerning changes in the enzymatic antioxidant systems are almost absent. With the aim to provide this information, antioxidant enzyme (superoxide dismutases, catalase and peroxidases) activities were analysed in leaves and roots of Triticum aestivum cvs Brasilia (frost resistant in field) and Eridano (less frost resistant in field) seedlings grown at day/night temperatures of 24/22°C (control treatment) and 12/5°C (low‐temperature treatment). Our data showed that superoxide dismutase activities were unaffected by low‐temperature treatment both in leaves and roots. Catalase activity in leaves and roots was decreased in 12/5°C‐grown seedlings, but Brasilia maintained higher catalase activity than Eridano. Differences were also observed in guaiacol peroxidase activities between control and acclimated seedlings: Higher guaiacol peroxidase activities were found in the leaves of 12/5°C‐grown seedlings while in roots these activities were lower. Moreover, Brasilia guaiacol peroxidase activities were higher than Eridano. Superoxide dismutase and peroxidase zymogram analyses showed that synthesis of new isoforms was not induced by low‐temperature treatment. Changes in the activities of antioxidant enzymes induced by cold acclimation support the hypothesis that a frost‐resistant wheat cultivar, in comparison with a less frost‐resistant one, maintains a better defence against activated oxygen species during low‐temperature treatment.
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Claims 9
Claim · model-written summary
Low temperature did not change superoxide dismutase activity in wheat leaves or roots.
- Taxon
- Triticum aestivum
Triticum aestivumt0 - Treatment
- low‐temperature treatmente0
- Outcome
- superoxide dismutase activitiese0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“superoxide dismutase activities were unaffected by low‐temperature treatment both in leaves and roots”
t0“Triticum aestivum”
Claim · model-written summary
Low temperature decreased catalase activity in wheat leaves and roots.
- Taxon
- Triticum aestivumTriticum aestivumt0
- Treatment
- 12/5°C‐growne0
- Outcome
- Catalase activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Catalase activity in leaves and roots was decreased in 12/5°C‐grown seedlings”
t0“Triticum aestivum”
Claim · model-written summary
Brasilia maintained higher catalase activity than Eridano.
- Taxon
- Triticum aestivumTriticum aestivumt0
- Material
- Brasiliae0
- Outcome
- catalase activitye0
- Direction
- highere0
- Comparator
- Eridanoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brasilia maintained higher catalase activity than Eridano”
t0“Triticum aestivum”
Claim · model-written summary
Cold acclimation increased guaiacol peroxidase activity in wheat leaves.
- Taxon
- Triticum aestivumTriticum aestivumt0
- Organ / stage
- leavese0
- Treatment
- 12/5°C‐growne0
- Outcome
- guaiacol peroxidase activitiese0
- Direction
- Highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher guaiacol peroxidase activities were found in the leaves of 12/5°C‐grown seedlings”
t0“Triticum aestivum”
Claim · model-written summary
Cold acclimation lowered guaiacol peroxidase activity in wheat roots.
- Taxon
- Triticum aestivumTriticum aestivumt0
- Organ / stage
- rootse0
- Treatment
- low‐temperature treatmentt1
- Outcome
- guaiacol peroxidase activitiese1
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while in roots these activities were lower”
e1“Higher guaiacol peroxidase activities were found in the leaves of 12/5°C‐grown seedlings”
t0“Triticum aestivum”
t1“grown at day/night temperatures of 24/22°C (control treatment) and 12/5°C (low‐temperature treatment)”
Claim · model-written summary
Brasilia had higher guaiacol peroxidase activity than Eridano.
- Taxon
- Triticum aestivumTriticum aestivumt0
- Material
- Brasiliae0
- Outcome
- guaiacol peroxidase activitiese0
- Direction
- highere0
- Comparator
- Eridanoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brasilia guaiacol peroxidase activities were higher than Eridano”
t0“Triticum aestivum”
Claim · model-written summary
Cold treatment did not induce new superoxide dismutase isoforms.
- Taxon
- Triticum aestivumTriticum aestivumt0
- Treatment
- low‐temperature treatmente0
- Outcome
- Superoxide dismutasee0
- Direction
- not inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Superoxide dismutase and peroxidase zymogram analyses showed that synthesis of new isoforms was not induced by low‐temperature treatment”
t0“Triticum aestivum”
Claim · model-written summary
Cold treatment did not induce new peroxidase isoforms.
- Taxon
- Triticum aestivumTriticum aestivumt0
- Treatment
- low‐temperature treatmente0
- Outcome
- peroxidasee0
- Direction
- not inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Superoxide dismutase and peroxidase zymogram analyses showed that synthesis of new isoforms was not induced by low‐temperature treatment”
t0“Triticum aestivum”
Claim · model-written summary
Authors interpret enzyme changes as supporting stronger activated oxygen defense in frost-resistant wheat.
- Taxon
- wheatTriticum aestivume0
- Outcome
- better defence against activated oxygen speciese0
- Qualifier
- Changes in the activities of antioxidant enzymes induced by cold acclimatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Changes in the activities of antioxidant enzymes induced by cold acclimation support the hypothesis that a frost‐resistant wheat cultivar, in comparison with a less frost‐resistant one, maintains a better defence against activated oxygen species during low‐temperature treatment”
The same questions in other papers
cold · physiology: antioxidant enzymes · Triticum aestivum (wheat)Results differ
7 papers in the same direction as this paper · 15 in the opposite direction
- positive
- positive
- positive
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See all 23 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.