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Publication Type J
Authors BYRD, GT; SAGE, RF; BROWN, RH
Author Full Name BYRD, GT; SAGE, RF; BROWN, RH
Title A COMPARISON OF DARK RESPIRATION BETWEEN C3 AND C4 PLANTS
Source PLANT PHYSIOLOGY
Language English
Document Type Article
Keywords Plus NITROGEN USE EFFICIENCY; MAINTENANCE RESPIRATION; BARLEY LEAVES; C-4 PLANTS; PHOTOSYNTHESIS; GROWTH; WHEAT; CARBOHYDRATE; TEMPERATURE; EVOLUTION
Abstract Lower respiratory costs were hypothesized as providing an additional benefit in C4 plants compared to C3 plants due to less investment in proteins in C4 leaves. Therefore, photosynthesis and dark respiration of mature leaves were compared between a number of C4 and C3 species. Although photosynthetic rates were generally greater in C4 When compared to C3 species, no differences were found in dark respiration rates of individual leaves at either the beginning or after 16 h of the dark period. The effects of nitrogen on photosynthesis and respiration of individual leaves and whole plants were also investigated in two species that occupy similar habitats, Amaranthus retroflexus (C4) and Chenopodium album (C3). For mature leaves of both species, there was no relationship between leaf nitrogen and leaf respiration, with leaves of both species exhibiting a similar rate of decline after 16 h of darkness. In contrast, leaf photosynthesis increased with increasing leaf nitrogen in both species, with the C4 species displaying a greater photosynthetic response to leaf nitrogen. For whole plants of both species grown at different nitrogen levels, there was a clear linear relationship between net CO2 uptake and CO2 efflux in the dark. The dependence of nightly CO2 efflux on CO2 uptake was similar for both species, although the response of CO2 uptake to leaf nitrogen was much steeper in the C4 species, Amaranthus retroflexus. Rates of growth and maintenance respiration by whole plants of both species were similar, with both species displaying higher rates at higher leaf nitrogen. There were no significant differences in leaf or whole plant maintenance respiration between species at any temperature between 18 and 42-degrees-C. The data suggest no obvious differences in respiratory costs in C4 and C3 plants.
Author Address UNIV GEORGIA,DEPT AGRON,ATHENS,GA 30602; UNIV GEORGIA,DEPT BOT,ATHENS,GA 30602
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Cited Reference Count 31
Times Cited 50
Total Times Cited Count (WoS, BCI, and CSCD) 50
Publisher AMER SOC PLANT PHYSIOLOGISTS
Publisher City ROCKVILLE
Publisher Address 15501 MONONA DRIVE, ROCKVILLE, MD 20855
ISSN 0032-0889
29-Character Source Abbreviation PLANT PHYSIOL
ISO Source Abbreviation Plant Physiol.
Publication Date SEP
Year Published 1992
Volume 100
Issue 1
Beginning Page 191
Ending Page 198
Digital Object Identifier (DOI) 10.1104/pp.100.1.191
Page Count 8
Web of Science Category Plant Sciences
Subject Category Plant Sciences
Document Delivery Number JR211
Unique Article Identifier WOS:A1992JR21100029
Plants associated with this reference

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