Publication Date
1993
Description
Carbon isotope discrimination (A) by plants can be directly related to plant water-use efficiency (W, total plant dry matter, OM, per water transpired) and used in selection to achieve greater W. As \V (and A) is a complex characteristic, there maybe inherent relationships between it and plant productivity. A range of pasture cultivars (of temperate grasses and legumes) were grown in pots (lo c. 50 days) and \V, A and total dry mailer measured. Among cultivars the relationship between W and A was negative and significant as was the relationship between A and total OM accumulation. A further experiment showed that at an earlier stage (c. 25 days) the relationship between total dry matter and A was positive for grass cultivars and negative for legume cultivars. These results arc discussed with respect to the usefulness of W as a physiological trait and the interpretation of apparent relationships between dry matter accumulation and A.
Citation
Virgona, J, "Relationships between growth and carbon Isotope Discrimination for some Pasture Species" (2024). IGC Proceedings (1993-2023). 36.
https://uknowledge.uky.edu/igc/1993/session8/36
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Relationships between growth and carbon Isotope Discrimination for some Pasture Species
Carbon isotope discrimination (A) by plants can be directly related to plant water-use efficiency (W, total plant dry matter, OM, per water transpired) and used in selection to achieve greater W. As \V (and A) is a complex characteristic, there maybe inherent relationships between it and plant productivity. A range of pasture cultivars (of temperate grasses and legumes) were grown in pots (lo c. 50 days) and \V, A and total dry mailer measured. Among cultivars the relationship between W and A was negative and significant as was the relationship between A and total OM accumulation. A further experiment showed that at an earlier stage (c. 25 days) the relationship between total dry matter and A was positive for grass cultivars and negative for legume cultivars. These results arc discussed with respect to the usefulness of W as a physiological trait and the interpretation of apparent relationships between dry matter accumulation and A.
