Document Detail

Growth and mitochondrial respiration of mungbeans (Phaseolus aureus Roxb.) germinated at low pressure.
MedLine Citation:
PMID:  11538232     Owner:  NASA     Status:  MEDLINE    
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.
M E Musgrave; W A Gerth; H W Scheld; B R Strain
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Plant physiology     Volume:  86     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1988  
Date Detail:
Created Date:  1995-12-11     Completed Date:  1995-12-11     Revised Date:  2010-09-14    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  19-22     Citation Subset:  S    
Department of Botany, Duke University, Durham, North Carolina 27706, USA.
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MeSH Terms
Atmosphere Exposure Chambers
Atmospheric Pressure*
Environment, Controlled
Fabaceae / growth & development*,  metabolism*,  physiology
Mitochondria / metabolism*
Oxygen Consumption / physiology*
Plants, Medicinal*
M E Musgrave / Duke U, Durham, NC

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