Abstract
Separation of catalase isozymes from leaf extracts of three diverse plant species (Nicotiana sylvestris, Zea mays, Hordeum vulgare L.) revealed a distinct isozyme with enhanced peroxidatic activity (30-, 70-, 28-fold over typical catalase, respectively) which constituted 10 to 20% of the total catalase activity. In maize this isozyme is the product of the Cat3 gene, which is expressed only in mesophyll cells (AS Tsaftaris, AM Bosabalidis, JG Scandalios [1983] Proc Natl Acad Sci USA 80: 4455-4459). A mutation in barley reducing levels of peroxisomal catalase (AC Kendall et al. [1983] Planta 159: 505-511) does not reduce the amount of the isozyme with enhanced peroxidatic activity. Similarly, this isozyme is unaffected in dark-grown barley in spite of a 75% decrease in total catalase activity. These results suggest that this catalase isozyme is under separate genetic control in barley. This may also be the case in tobacco where the catalase isozyme with enhanced peroxidatic activity is an immunologically distinct protein (EA Havir, NA McHale [1989] Plant Physiol 89: 952-957).
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Claims 8
Claim · model-written summary
A tobacco leaf catalase isozyme had 30-fold enhanced peroxidatic activity over typical catalase.
- Taxon
- Nicotiana sylvestris
.jpg?width=60)
Nicotiana sylvestrise0 - Organ / stage
- leafe0
- Gene
- catalasee0
- Outcome
- peroxidatic activitye0
- Direction
- enhancede0
- Value
- 30-e0
- Comparator
- typical catalasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Separation of catalase isozymes from leaf extracts of three diverse plant species (Nicotiana sylvestris, Zea mays, Hordeum vulgare L.) revealed a distinct isozyme with enhanced peroxidatic activity (30-, 70-, 28-fold over typical catalase, respectively) which constituted 10 to 20% of the total catalase activity.”
Claim · model-written summary
A maize leaf catalase isozyme had 70-fold enhanced peroxidatic activity over typical catalase.
- Organ / stage
- leafe0
- Gene
- catalasee0
- Outcome
- peroxidatic activitye0
- Direction
- enhancede0
- Value
- 70-e0
- Comparator
- typical catalasee0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Separation of catalase isozymes from leaf extracts of three diverse plant species (Nicotiana sylvestris, Zea mays, Hordeum vulgare L.) revealed a distinct isozyme with enhanced peroxidatic activity (30-, 70-, 28-fold over typical catalase, respectively) which constituted 10 to 20% of the total catalase activity.”
Claim · model-written summary
A barley leaf catalase isozyme had 28-fold enhanced peroxidatic activity over typical catalase.
- Taxon
- Hordeum vulgare L.
.jpg?width=60)
Hordeum vulgaree0 - Organ / stage
- leafe0
- Gene
- catalasee0
- Outcome
- peroxidatic activitye0
- Direction
- enhancede0
- Value
- 28-folde0
- Comparator
- typical catalasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Separation of catalase isozymes from leaf extracts of three diverse plant species (Nicotiana sylvestris, Zea mays, Hordeum vulgare L.) revealed a distinct isozyme with enhanced peroxidatic activity (30-, 70-, 28-fold over typical catalase, respectively) which constituted 10 to 20% of the total catalase activity.”
Claim · model-written summary
The enhanced isozyme constituted 10 to 20% of total catalase activity in the three species.
Not reportedTaxon
Verbatim
e0“which constituted 10 to 20% of the total catalase activity”
Claim · model-written summary
The barley mutation reducing peroxisomal catalase did not reduce the enhanced isozyme.
- Taxon
- barleyHordeum vulgaree0
- Material
- A mutatione0
- Gene
- peroxisomal catalasee0
- Outcome
- amount of the isozyme with enhanced peroxidatic activitye0
- Direction
- does not reducee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A mutation in barley reducing levels of peroxisomal catalase (AC Kendall et al. [1983] Planta 159: 505-511) does not reduce the amount of the isozyme with enhanced peroxidatic activity.”
Claim · model-written summary
In dark-grown barley the enhanced isozyme was unaffected despite a 75% decrease in total catalase activity.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- dark-growne0
- Outcome
- this isozymee0
- Direction
- unaffectede0
- Qualifier
- 75% decrease in total catalase activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similarly, this isozyme is unaffected in dark-grown barley in spite of a 75% decrease in total catalase activity.”
Claim · model-written summary
The authors suggest separate genetic control of the enhanced catalase isozyme in barley.
- Taxon
- barleyHordeum vulgaree0
- Gene
- catalasee0
- Outcome
- separate genetic controle0
- Qualifier
- suggeste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results suggest that this catalase isozyme is under separate genetic control in barley.”
Claim · model-written summary
The enhanced catalase isozyme in tobacco is immunologically distinct.
- Taxon
- tobacco
Nicotiana tabacume0 - Gene
- catalase isozymee0
- Outcome
- immunologically distinct proteine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This may also be the case in tobacco where the catalase isozyme with enhanced peroxidatic activity is an immunologically distinct protein”