Abstract
Mungbean (Phaseolus aureus Roxb.) seedlings were grown hypobarically to assess the effects of low pressure (21-24 kilopascals) on growth and mitochondrial respiration. Control seedlings grown at ambient pressure (101 kilopascals) were provided amounts of O2 equivalent to those provided experimental seedlings at reduced pressure to factor out responses to O2 concentration and to total pressure. Respiration was assayed using washed mitochondria, and was found to respond only to O2 concentration. Regardless of total pressure, seedlings grown at 2 millimoles O2 per liter had higher state 3 respiration rates and decreased percentages of alternative respiration compared to ambient (8.4 millimoles O2 per liter) controls. In contrast, seedling growth responded to total pressure but not to O2 concentration. Seedlings were significantly larger when grown under low pressure. While low O2 (2 millimoles O2 per liter) diminished growth at ambient pressure, growth at low pressure in the same oxygen concentration was enhanced. Respiratory development and growth of mungbean seedlings under low pressure is unimpaired whether oxygen or air is used as the chamber gas, and further, low pressure can improve growth under conditions of poor aeration.
Full text
PDFImages in this article
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Krikorian A. D., O'Connor S. A. Karyological observations. Ann Bot. 1984 Nov;54(Suppl 3):49–63. doi: 10.1093/oxfordjournals.aob.a086866. [DOI] [PubMed] [Google Scholar]
- Leopold A. C., Musgrave M. E. Respiratory changes with chilling injury of soybeans. Plant Physiol. 1979 Nov;64(5):702–705. doi: 10.1104/pp.64.5.702. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Siedow J. N., Bickett D. M. Binding of butyl gallate to isolated mung bean mitochondria : relationship to inhibition of the alternative pathway. Plant Physiol. 1983 Jun;72(2):339–344. doi: 10.1104/pp.72.2.339. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Slocum R. D., Gaynor J. J., Galston A. W. Cytological and ultrastructural studies on root tissues. Ann Bot. 1984 Nov;54(Suppl 3):65–76. doi: 10.1093/oxfordjournals.aob.a086867. [DOI] [PubMed] [Google Scholar]