Influence of atmospheric oxygen on leaf structure and starch deposition in Arabidopsis thaliana

Plant culture in oxygen concentrations below ambient is known to stimulate vegetative growth, but apart from reports on increased leaf number and weight, little is known about development at subambient oxygen concentrations. Arabidopsis thaliana (L.) Heynh. (cv. Columbia) plants were grown full term...

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Published in:Plant, cell and environment cell and environment, 2001-04, Vol.24 (4), p.419-428
Main Authors: Ramonell, K. M., Kuang, A., Porterfield, D. M., Crispi, M. L., Xiao, Y., McClure, G., Musgrave, M. E.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Arabidopsis
Arabidopsis - drug effects
Arabidopsis - growth & development
Arabidopsis - metabolism
Arabidopsis - ultrastructure
Biological and medical sciences
Biological Transport - drug effects
Brassinosteroids
Carbon Dioxide - pharmacology
Cell Respiration
cell size
Cholestanols - metabolism
Dose-Response Relationship, Drug
Economic plant physiology
Fundamental and applied biological sciences. Psychology
Growth and development
leaf ultrastructure
Life Sciences (General)
Microscopy, Electron
Mitochondria - drug effects
Morphogenesis, differentiation, rhizogenesis, tuberization. Senescence
Oxygen - pharmacology
Partial Pressure
Photosynthesis
Physical agents
Plant Leaves - drug effects
Plant Leaves - growth & development
Plant Leaves - metabolism
Plant Leaves - ultrastructure
Plant physiology and development
Plastids - drug effects
Space life sciences
Starch - biosynthesis
Starch - metabolism
Steroids, Heterocyclic - metabolism
Vegetative apparatus, growth and morphogenesis. Senescence
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Summary:Plant culture in oxygen concentrations below ambient is known to stimulate vegetative growth, but apart from reports on increased leaf number and weight, little is known about development at subambient oxygen concentrations. Arabidopsis thaliana (L.) Heynh. (cv. Columbia) plants were grown full term in pre-mixed atmospheres with oxygen partial pressures of 2.5, 5.1, 10.1, 16.2, and 21.3 kPa O2, 0.035 kPa CO2 and the balance nitrogen under continuous light. Fully expanded leaves were harvested and processed for light and transmission electron microscopy or for starch quantification. Growth in subambient oxygen concentrations caused changes in leaf anatomy (increased thickness, stomatal density and starch content) that have also been described for plants grown under carbon dioxide enrichment. However, at the lowest oxygen treatment (2.5 kPa), developmental changes occurred that could not be explained by changes in carbon budget caused by suppressed photorespiration, resulting in very thick leaves and a dwarf morphology. This study establishes the leaf parameters that change during growth under low O2, and identifies the lower concentration at which O2 limitation on transport and biosynthetic pathways detrimentally affects leaf development. Grant numbers: NAG5-3756, NAG2-1020, NAG2-1375.
ISSN:0140-7791
1365-3040
DOI:10.1046/j.1365-3040.2001.00691.x