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. 1989 Apr;89(4):1275–1278. doi: 10.1104/pp.89.4.1275

Dependence of Ethanolic Fermentation, Cytoplasmic pH Regulation, and Viability on the Activity of Alcohol Dehydrogenase in Hypoxic Maize Root Tips 1

Justin K M Roberts 1,2, Keejong Chang 1,2, Cecelia Webster 1,2, Judy Callis 1,2,2, Virginia Walbot 1,2
PMCID: PMC1056008  PMID: 16666696

Abstract

We examined the role of alcohol dehydrogenase (ADH) in the metabolism and survival of hypoxic maize (Zea mays L.) root tips. The dependence of the rate of ethanolic fermentation, cytoplasmic pH, and viability on the activity of ADH in maize root tips during extreme hypoxia was determined. Maize lines with ADH activities differing over about a 200-fold range were studied. Effects of genetic background were controlled by comparing pairs of F4 progeny of crosses between mutant (low ADH activity) and reference inbred lines. The capacity of hypoxic root tips to perform ethanolic fermentation exhibited a dependence on ADH activity only at activities found in Adh 1 nulls. The ability of maize root tips to withstand prolonged and extreme hypoxia was like-wise independent of ADH activity, except at the lowest activities. Root tips that exhibited lower tolerance of hypoxia had more acidic cytoplasm during extreme hypoxia. We conclude that the activity of ADH in normal maize root tips does not limit the capacity for energy production via fermentation, and does not determine viability under extreme hypoxia. The significance of the induction of ADH activity in plants by hypoxia is discussed.

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Selected References

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  1. Bradford M. M. A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding. Anal Biochem. 1976 May 7;72:248–254. doi: 10.1006/abio.1976.9999. [DOI] [PubMed] [Google Scholar]
  2. Freeling M., Bennett D. C. Maize Adh1. Annu Rev Genet. 1985;19:297–323. doi: 10.1146/annurev.ge.19.120185.001501. [DOI] [PubMed] [Google Scholar]
  3. Holzhütter H. G., Jacobasch G., Bisdorff A. Mathematical modelling of metabolic pathways affected by an enzyme deficiency. A mathematical model of glycolysis in normal and pyruvate-kinase-deficient red blood cells. Eur J Biochem. 1985 May 15;149(1):101–111. doi: 10.1111/j.1432-1033.1985.tb08899.x. [DOI] [PubMed] [Google Scholar]
  4. Kacser H., Burns J. A. MOlecular democracy: who shares the controls? Biochem Soc Trans. 1979 Oct;7(5):1149–1160. doi: 10.1042/bst0071149. [DOI] [PubMed] [Google Scholar]
  5. Kimmerer T. W. Alcohol Dehydrogenase and Pyruvate Decarboxylase Activity in Leaves and Roots of Eastern Cottonwood (Populus deltoides Bartr.) and Soybean (Glycine max L.). Plant Physiol. 1987 Aug;84(4):1210–1213. doi: 10.1104/pp.84.4.1210. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Middleton R. J., Kacser H. Enzyme variation, metabolic flux and fitness: alcohol dehydrogenase in Drosophila melanogaster. Genetics. 1983 Nov;105(3):633–650. doi: 10.1093/genetics/105.3.633. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Roberts J. K., Callis J., Jardetzky O., Walbot V., Freeling M. Cytoplasmic acidosis as a determinant of flooding intolerance in plants. Proc Natl Acad Sci U S A. 1984 Oct;81(19):6029–6033. doi: 10.1073/pnas.81.19.6029. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Roberts J. K., Callis J., Wemmer D., Walbot V., Jardetzky O. Mechanisms of cytoplasmic pH regulation in hypoxic maize root tips and its role in survival under hypoxia. Proc Natl Acad Sci U S A. 1984 Jun;81(11):3379–3383. doi: 10.1073/pnas.81.11.3379. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Saglio P. H., Drew M. C., Pradet A. Metabolic Acclimation to Anoxia Induced by Low (2-4 kPa Partial Pressure) Oxygen Pretreatment (Hypoxia) in Root Tips of Zea mays. Plant Physiol. 1988 Jan;86(1):61–66. doi: 10.1104/pp.86.1.61. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Schwartz D., Endo T. Alcohol Dehydrogenase Polymorphism in Maize-simple and Compound Loci. Genetics. 1966 Apr;53(4):709–715. doi: 10.1093/genetics/53.4.709. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Shimomura S., Beevers H. Alcohol dehydrogenase and an inactivator from rice seedlings. Plant Physiol. 1983 Apr;71(4):736–741. doi: 10.1104/pp.71.4.736. [DOI] [PMC free article] [PubMed] [Google Scholar]
  12. Westerhoff H. V., Groen A. K., Wanders R. J. Modern theories of metabolic control and their applications (review). Biosci Rep. 1984 Jan;4(1):1–22. doi: 10.1007/BF01120819. [DOI] [PubMed] [Google Scholar]

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