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Environ Health Perspect. 1981 Jan; 37: 5–7.
PMCID: PMC1568640
Research Article

Ontogeny of the barley plant as related to mutation expression and detection of pollen mutations.


Clustering of mutant pollen grains in a population of normal pollen due to premeiotic mutational events complicates translating mutation frequencies into rates. Embryo ontogeny in barley will be described and used to illustrate the formation of such mutant clusters. The nature of the statistics for mutation frequency will be described from a study of the reversion frequencies of various waxy mutants in barley. Computer analysis by a "jackknife" method of the reversion frequencies of a waxy mutant treated with the mutagen sodium azide showed a significantly higher reversion frequency than untreated material. Problems of the computer analysis suggest a better experimental design for pollen mutation experiments. Preliminary work on computer modeling for pollen development and mutation will be described.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Engels WR. The estimation of mutation rates when premeiotic events are involved. Environ Mutagen. 1979;1(1):37–43. [PubMed]
  • Katz AJ. Design and analysis of experiments on mutagenicity. I. Minimal sample sizes. Mutat Res. 1978 Jun;50(3):301–307. [PubMed]
  • Katz AJ. Design and analysis of experiments on mutagenicity. II. Assays involving microorganisms. Mutat Res. 1979 Apr;64(2):61–77. [PubMed]
  • Lingren D. Sensitivity of premeiotic and meiotic stages to spontaneous and induced mutations in barley and maize. Hereditas. 1975;79(2):227–238. [PubMed]

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