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Analysis of respiratory metabolism correlates well with the response of Eucalyptus camaldulensis seedlings to NaCl and high pH
Year:
2002
Source of publication :
Functional Plant Biology
Authors :
Zohar, Yale
;
.
Volume :
29
Co-Authors:
Marcar, N.E., CSIRO Forestry and Forest Products, PO Box E4008, Kingston, ACT 2604, Australia
Criddle, R.S., CSIRO Forestry and Forest Products, PO Box E4008, Kingston, ACT 2604, Australia
Guo, J., CSIRO Forestry and Forest Products, PO Box E4008, Kingston, ACT 2604, Australia
Zohar, Y., CSIRO Forestry and Forest Products, PO Box E4008, Kingston, ACT 2604, Australia
Facilitators :
From page:
925
To page:
932
(
Total pages:
8
)
Abstract:
Growth of sand-cultured Eucalyptus camaldulensis Dehnh. (river red gum) seedlings from six wide-ranging provenances was reduced in the presence of 150 mM NaCl, a high pH of 9.5, and combined NaCl and high pH, compared with no applied NaCl and neutral pH. Effects of these stress conditions on respiration rates and substrate carbon conversion efficiencies of rapidly-expanding leaf tissue were measured with calorespirometric techniques. Growth rates were calculated from respiration parameters. Respiration rate, measured as metabolic heat production rate (q), showed no consistent trend with either NaCl or high pH, whereas the rate measured as CO2 production rate (RCO2) was generally lower with both treatments. The ratio of heat lost per mole of CO2 produced [q/(RCO2)] was consistently increased by both stresses. Stress causes a larger fraction of metabolic energy produced by aerobic metabolism to be lost as heat, relative to non-stressed controls. Consequently, a larger fraction of photosynthetic product in stressed seedlings must be metabolized to CO2 per mole of C incorporated into biomass. Our results indicate that 0.42 mol substrate C is converted to CO2 per mole C incorporated into biomass for control plants, compared with 0.96 mol for plants treated with combined NaCl and high pH. Respiratory responses to treatment varied with provenance. Specific growth rates, calculated from respiratory parameters (q and RCO2) of stressed E. camaldulensis seedlings, generally paralleled experimentally-determined reduced growth (dry weight) of these seedlings. Thus, measurements of leaf respiration allow calculation of growth inhibition caused by NaCl and high pH stress. However, we could not discriminate among provenances in this experiment with only one level of NaCl and pH.
Note:
Related Files :
Biomass
Environmental stress
Eucalyptus
metabolism
pH
photosynthesis
respiration
salinity
Seed
Show More
Related Content
More details
DOI :
10.1071/PP01170
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
20904
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:40
Scientific Publication
Analysis of respiratory metabolism correlates well with the response of Eucalyptus camaldulensis seedlings to NaCl and high pH
29
Marcar, N.E., CSIRO Forestry and Forest Products, PO Box E4008, Kingston, ACT 2604, Australia
Criddle, R.S., CSIRO Forestry and Forest Products, PO Box E4008, Kingston, ACT 2604, Australia
Guo, J., CSIRO Forestry and Forest Products, PO Box E4008, Kingston, ACT 2604, Australia
Zohar, Y., CSIRO Forestry and Forest Products, PO Box E4008, Kingston, ACT 2604, Australia
Analysis of respiratory metabolism correlates well with the response of Eucalyptus camaldulensis seedlings to NaCl and high pH
Growth of sand-cultured Eucalyptus camaldulensis Dehnh. (river red gum) seedlings from six wide-ranging provenances was reduced in the presence of 150 mM NaCl, a high pH of 9.5, and combined NaCl and high pH, compared with no applied NaCl and neutral pH. Effects of these stress conditions on respiration rates and substrate carbon conversion efficiencies of rapidly-expanding leaf tissue were measured with calorespirometric techniques. Growth rates were calculated from respiration parameters. Respiration rate, measured as metabolic heat production rate (q), showed no consistent trend with either NaCl or high pH, whereas the rate measured as CO2 production rate (RCO2) was generally lower with both treatments. The ratio of heat lost per mole of CO2 produced [q/(RCO2)] was consistently increased by both stresses. Stress causes a larger fraction of metabolic energy produced by aerobic metabolism to be lost as heat, relative to non-stressed controls. Consequently, a larger fraction of photosynthetic product in stressed seedlings must be metabolized to CO2 per mole of C incorporated into biomass. Our results indicate that 0.42 mol substrate C is converted to CO2 per mole C incorporated into biomass for control plants, compared with 0.96 mol for plants treated with combined NaCl and high pH. Respiratory responses to treatment varied with provenance. Specific growth rates, calculated from respiratory parameters (q and RCO2) of stressed E. camaldulensis seedlings, generally paralleled experimentally-determined reduced growth (dry weight) of these seedlings. Thus, measurements of leaf respiration allow calculation of growth inhibition caused by NaCl and high pH stress. However, we could not discriminate among provenances in this experiment with only one level of NaCl and pH.
Scientific Publication
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