Spontaneous forward mutation versus reversion frequencies for maize Adh1 in pollen
1Genetics Department, University of California, Berkeley 94720, USA.
Nature
|May 12, 1977
Summary
This study quantifies spontaneous gene mutation frequencies in maize pollen using advanced ADH1 gene assays. It establishes a new method for detecting mutations and comparing forward mutation rates with existing revertant frequencies.
Area of Science:
- Plant genetics
- Molecular biology
- Mutation research
Background:
- Quantitative data on spontaneous gene mutation frequencies in higher plants is limited.
- The alcohol dehydrogenase-1 (Adh1) gene in maize pollen offers a suitable system for mutation studies due to its dispensable function and expression in gametophytes.
Purpose of the Study:
- To compare spontaneous forward mutation frequencies with previously published revertant frequencies for Adh1-deficient alleles in maize.
- To introduce and validate novel cytochemical and selective techniques for measuring gene mutation rates in plant gametophytes.
Main Methods:
- Utilized cytochemical staining to detect ADH activity in maize pollen.
- Employed allyl alcohol selection to differentiate between ADH1+ and ADH1- pollen grains.
- Compared spontaneous forward mutation rates (Adh1+ to ADH-) with existing revertant frequencies (Adh1- to ADH+) for various Adh1 alleles.
Main Results:
- Achieved a genetic resolution of approximately 1 mutant per 10(7) viable gametophytes for forward mutations.
- Demonstrated the efficacy of allyl alcohol selection for identifying Adh1-deficient mutants.
- Provided comparative data on spontaneous mutation frequencies for naturally occurring and induced Adh1- alleles.
Conclusions:
- The developed methods enable reliable quantitative assessment of gene mutation frequencies in maize pollen.
- The study contributes valuable data for understanding spontaneous mutation rates in higher plants.
- The findings facilitate further research into the genetic and molecular basis of mutation in plants.
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