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| Publication Type:
| Refereed |
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| Author(s): | Bowman, William D.;
Hubick, Kerry T.;
Caemmerer, Susanne Von;
Farquhar, Graham D. |
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| Author Affiliation: | University of Colorado and Plant Environmental Biology Group, Research School of Biological Sciences, The Australian National University |
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| Title: | Short-Term Changes in Leaf Carbon Isotopes Discrimination in Salt- and Water-Stressed C4 Grasses. |
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| Source: | Plant Physiology. Vol. 90, No. 1, May 1989, p. 162-166. |
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| Publishing Information: | Lancaster, PA: American Society of Plant Physiologists |
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| Keywords: | TIC Keywords: Carbon; Isotopes
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| Abstract/Contents: | "Online carbon isotope discrimiation (delta) and leaf gas exchange measurements were made with control and salt-stressed Zea mays and Andropogon glomeratus, two NADP-ME type C4 grasses. Linear relationships between delta and pi/pa (the ratio of intercellualr to atmospheric CO2 partial pressure) were found for control plants which agreed well with theoretical models describing carbon isotope discrimination in C4 plants. These data provided estimates of , the proportion of CO2 fixed by phosphoenolpyruvate carboxylase which leaks out of the bundle sheath and the component of fractionation due to diffusion in air. Salt-stressed plants had wider variation in delta for the same or less range in pi/pa. Additional work indicated delta changed independently of pi/pa in both water- and salt-stressed plants, suggesting a possible diurnal change in as plant water status changed linked to a decrease in the activity. The possible effect of stress-induced changes in on organic matter 13C of C4 plants is apt to be most apparent in chronically stressed environments" |
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| Language: | English |
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| References: | 25 |
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| Note: | Figures |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bowman, W. D., K. T. Hubick, S. V. Caemmerer, and G. D. Farquhar. 1989. Short-Term Changes in Leaf Carbon Isotopes Discrimination in Salt- and Water-Stressed C4 Grasses.. Plant Physiol. 90(1):p. 162-166. |
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