Correlation between carbon isotope discrimination and transpiration efficiency in lines of the c-4 species sorghum bicolor in the glasshouse and the field
Transpiration efficiency, W, the ratio of plant carbon produced to water transpired and carbon isotope discrimination of leaf dry matter, Δd, were measured together on 30 lines of the C4 species, Sorghum bicolor, in the glasshouse and on eight lines grown in the field. In the glasshouse, the mean W...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Commonwealth Scientific and Industrial Research Organisation
1998
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| Online Access: | https://hdl.handle.net/10568/167223 |
| _version_ | 1855543540406288384 |
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| author | Henderson, S. Caemmerer, S. von Farquhar, G.D. Wade, L. Hammer, G. |
| author_browse | Caemmerer, S. von Farquhar, G.D. Hammer, G. Henderson, S. Wade, L. |
| author_facet | Henderson, S. Caemmerer, S. von Farquhar, G.D. Wade, L. Hammer, G. |
| author_sort | Henderson, S. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Transpiration efficiency, W, the ratio of plant carbon produced to water transpired and carbon isotope discrimination of leaf dry matter, Δd, were measured together on 30 lines of the C4 species, Sorghum bicolor, in the glasshouse and on eight lines grown in the field. In the glasshouse, the mean W observed was 4.9 mmol C mol-1 H2O and the range was 0.8 mmol C mol -1 H2O. The mean Δd was 3.0 and the observed range was 0.4‰. In the field, the mean W was lower at 2.8 mmol C mol-1 H2O and the mean Δd was 4.6‰. Significant positive correlations between W and Δd were observed for plants grown in the glasshouse and in the field. The observed correlations were consistent with theory, opposite to those for C3 species, and showed that variation in Δd was an integrated measure of long-term variation in the ratio of intercellular to ambient CO2 partial pressure, pi/pa. Detailed gas exchange measurements of carbon isotope discrimination during CO2 uptake, ΔA, and pi/pa were made on leaves of eight S. bicolorlines. The observed relationship between ΔA and pi/pa was linear with a negative slope of 3.7‰ in ΔA for a unit change in pi/pa. The slope of this linear relationship between ΔA and pi/pa in C4 species is dependent on the leakiness of the CO2 concentrating mechanism of the C4 pathway. We estimated the leakiness (defined as the fraction of CO2 released in the bundle sheath by C4 acid decarboxylations, which is lost by leakage) to be 0.2. We conclude that, although variation in Δd observed in the 30 lines of S. bicolor is smaller than that commonly observed in C3 species, it also reflects variation in transpiration efficiency, W. Among the eight lines examined in detail and in the environments used, there was considerable genotype × environment interaction. |
| format | Journal Article |
| id | CGSpace167223 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1998 |
| publishDateRange | 1998 |
| publishDateSort | 1998 |
| publisher | Commonwealth Scientific and Industrial Research Organisation |
| publisherStr | Commonwealth Scientific and Industrial Research Organisation |
| record_format | dspace |
| spelling | CGSpace1672232025-12-08T10:29:22Z Correlation between carbon isotope discrimination and transpiration efficiency in lines of the c-4 species sorghum bicolor in the glasshouse and the field Henderson, S. Caemmerer, S. von Farquhar, G.D. Wade, L. Hammer, G. Transpiration efficiency, W, the ratio of plant carbon produced to water transpired and carbon isotope discrimination of leaf dry matter, Δd, were measured together on 30 lines of the C4 species, Sorghum bicolor, in the glasshouse and on eight lines grown in the field. In the glasshouse, the mean W observed was 4.9 mmol C mol-1 H2O and the range was 0.8 mmol C mol -1 H2O. The mean Δd was 3.0 and the observed range was 0.4‰. In the field, the mean W was lower at 2.8 mmol C mol-1 H2O and the mean Δd was 4.6‰. Significant positive correlations between W and Δd were observed for plants grown in the glasshouse and in the field. The observed correlations were consistent with theory, opposite to those for C3 species, and showed that variation in Δd was an integrated measure of long-term variation in the ratio of intercellular to ambient CO2 partial pressure, pi/pa. Detailed gas exchange measurements of carbon isotope discrimination during CO2 uptake, ΔA, and pi/pa were made on leaves of eight S. bicolorlines. The observed relationship between ΔA and pi/pa was linear with a negative slope of 3.7‰ in ΔA for a unit change in pi/pa. The slope of this linear relationship between ΔA and pi/pa in C4 species is dependent on the leakiness of the CO2 concentrating mechanism of the C4 pathway. We estimated the leakiness (defined as the fraction of CO2 released in the bundle sheath by C4 acid decarboxylations, which is lost by leakage) to be 0.2. We conclude that, although variation in Δd observed in the 30 lines of S. bicolor is smaller than that commonly observed in C3 species, it also reflects variation in transpiration efficiency, W. Among the eight lines examined in detail and in the environments used, there was considerable genotype × environment interaction. 1998 2024-12-19T12:57:08Z 2024-12-19T12:57:08Z Journal Article https://hdl.handle.net/10568/167223 en Commonwealth Scientific and Industrial Research Organisation Henderson, S.; Caemmerer, S. von; Farquhar, G.D.; Wade, L. and Hammer, G. 1998. Correlation between carbon isotope discrimination and transpiration efficiency in lines of the c-4 species sorghum bicolor in the glasshouse and the field. Functional Plant Biol., Volume 25 no. 1 p. 111 |
| spellingShingle | Henderson, S. Caemmerer, S. von Farquhar, G.D. Wade, L. Hammer, G. Correlation between carbon isotope discrimination and transpiration efficiency in lines of the c-4 species sorghum bicolor in the glasshouse and the field |
| title | Correlation between carbon isotope discrimination and transpiration efficiency in lines of the c-4 species sorghum bicolor in the glasshouse and the field |
| title_full | Correlation between carbon isotope discrimination and transpiration efficiency in lines of the c-4 species sorghum bicolor in the glasshouse and the field |
| title_fullStr | Correlation between carbon isotope discrimination and transpiration efficiency in lines of the c-4 species sorghum bicolor in the glasshouse and the field |
| title_full_unstemmed | Correlation between carbon isotope discrimination and transpiration efficiency in lines of the c-4 species sorghum bicolor in the glasshouse and the field |
| title_short | Correlation between carbon isotope discrimination and transpiration efficiency in lines of the c-4 species sorghum bicolor in the glasshouse and the field |
| title_sort | correlation between carbon isotope discrimination and transpiration efficiency in lines of the c 4 species sorghum bicolor in the glasshouse and the field |
| url | https://hdl.handle.net/10568/167223 |
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