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The genetic control and biochemical modification of catechol oxidase in maize
- Source :
- Genetics. 75(1)
- Publication Year :
- 1973
-
Abstract
- Three isozyme variants of catechol oxidase have been shown to be determined by alleles of a gene, Cx, which has been located on chromosome 10 less than 0.1 recombination units from the endosperm marker du 1.—The extractable form of the enzyme is modified by an endogeneous "modifier" which appears to function as an enzyme substrate. Enzyme and modifier are functionally isolated in intact cells. Modified enzyme has altered kinetics, does not migrate in electrophoresis and most probably results from a "tanning" of the enzyme by reaction products. The content of modifier varies in different lines and is genetically determined by gene(s) independent of Cx. Treatment with maleic hydrazide causes a ten-fold reduction in the modifier content of seedlings, allowing the enzyme to be extracted in an unmodified form which will migrate in electrophoresis.—This system of enzyme and modifier fits the requirements of hypersensitive disease resistance in plants and may provide a test system to investigate the biochemical basis of disease resistance.
- Subjects :
- Electrophoresis
Time Factors
Chromatography, Paper
Electrophoresis, Starch Gel
Catechols
Investigations
Isozyme
Zea mays
Endosperm
Oxygen Consumption
Genetics
Binding site
Enzyme inducer
Catechol oxidase
Cellulose
Gene
chemistry.chemical_classification
Chromosome Aberrations
Recombination, Genetic
Binding Sites
biology
Maleates
Substrate (chemistry)
Chromosome Mapping
Molecular biology
Isoenzymes
Kinetics
Enzyme
Hydrazines
Biochemistry
chemistry
Seeds
biology.protein
Hybridization, Genetic
Catechol Oxidase
Protein Binding
Subjects
Details
- ISSN :
- 00166731
- Volume :
- 75
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Genetics
- Accession number :
- edsair.doi.dedup.....fddab7f89a4fabe77b6a50a1ddb13156