Abstract
Abstract Cataiase, peroxidase and IAA‐oxidase activities, so as odiphenolics content in sunflower leaves grown in hydroponics with 4 B levels (0.05; 0.25; 0.5 and 2.0 ppm) were determined. The biochemical assays were made when visual symptons were clearly developed. Cataiase activity significantly increased in B deficient leaves. Peroxidase, IAA‐oxidase activities and o‐diphenolics content did not significantly change with B levels. The lag period for IAA‐oxidase activity was significantly reduced in B deficient and toxic leaves with respect to the normal ones. These results are in accordance with the hypothesis that one of the B action could be to enhance cataiase activity, the “in vivo” decrease of H2O2 levels beeing the cause of the variation in other enzymatic activities related with that substrate.
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Claims 7
Claim · model-written summary
Catalase activity significantly increased in boron-deficient sunflower leaves.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- B deficiente0
- Outcome
- Cataiase activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower leaves”
e0“Cataiase activity significantly increased in B deficient leaves”
Claim · model-written summary
Peroxidase activity did not significantly change across boron levels in sunflower leaves.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- B levelse0
- Outcome
- Peroxidasee0
- Direction
- did not significantly changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower leaves”
e0“Peroxidase, IAA‐oxidase activities and o‐diphenolics content did not significantly change with B levels”
Claim · model-written summary
IAA-oxidase activity did not significantly change across boron levels in sunflower leaves.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- B levelse0
- Outcome
- IAA‐oxidase activitiese0
- Direction
- did not significantly changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower leaves”
e0“Peroxidase, IAA‐oxidase activities and o‐diphenolics content did not significantly change with B levels”
Claim · model-written summary
O-diphenolics content did not significantly change across boron levels in sunflower leaves.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- B levelse0
- Outcome
- o‐diphenolics contente0
- Direction
- did not significantly changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower leaves”
e0“Peroxidase, IAA‐oxidase activities and o‐diphenolics content did not significantly change with B levels”
Claim · model-written summary
The IAA-oxidase lag period was significantly shorter in boron-deficient sunflower leaves than normal leaves.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- B deficiente0
- Outcome
- lag period for IAA‐oxidase activitye0
- Direction
- reducede0
- Comparator
- the normal onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower leaves”
e0“The lag period for IAA‐oxidase activity was significantly reduced in B deficient and toxic leaves with respect to the normal ones”
Claim · model-written summary
The IAA-oxidase lag period was significantly shorter in boron-toxic sunflower leaves than normal leaves.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- toxice0
- Outcome
- lag period for IAA‐oxidase activitye0
- Direction
- reducede0
- Comparator
- the normal onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower leaves”
e0“The lag period for IAA‐oxidase activity was significantly reduced in B deficient and toxic leaves with respect to the normal ones”
Claim · model-written summary
The authors hypothesize that boron enhances catalase activity, lowering in vivo H2O2 and changing other enzyme activities.
- Taxon
- sunflowerHelianthus annuust0
- Compound
- H2O2e0
- Outcome
- variation in other enzymatic activitiese0
- Qualifier
- one of the B action could be to enhance cataiase activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower leaves”
e0“one of the B action could be to enhance cataiase activity, the “in vivo” decrease of H2O2 levels beeing the cause of the variation in other enzymatic activities related with that substrate”
The same questions in other papers
boron atom · molecular: metabolites · Helianthus annuus (common sunflower)Positive and negative results
2 papers in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 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.