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Relationship of leaf oxygen and carbon isotopic composition with transpiration efficiency in the C4 grasses Setaria viridis and Setaria italica
- Source :
- Journal of Experimental Botany
- Publication Year :
- 2017
- Publisher :
- Oxford University Press, 2017.
-
Abstract
- Leaf carbon isotopic composition correlated well with transpiration efficiency, while leaf oxygen isotopic composition was confounded by leaf length in the C4 grasses Setaria viridis and Setaria italica.<br />Leaf carbon and oxygen isotope ratios can potentially provide a time-integrated proxy for stomatal conductance (gs) and transpiration rate (E), and can be used to estimate transpiration efficiency (TE). In this study, we found significant relationships of bulk leaf carbon isotopic signature (δ13CBL) and bulk leaf oxygen enrichment above source water (Δ18OBL) with gas exchange and TE in the model C4 grasses Setaria viridis and S. italica. Leaf δ13C had strong relationships with E, gs, water use, biomass, and TE. Additionally, the consistent difference in δ13CBL between well-watered and water-limited plants suggests that δ13CBL is effective in separating C4 plants with different availability of water. Alternatively, the use of Δ18OBL as a proxy for E and TE in S. viridis and S. italica was problematic. First, the oxygen isotopic composition of source water, used to calculate leaf water enrichment (Δ18OLW), was variable with time and differed across water treatments. Second, water limitations changed leaf size and masked the relationship of Δ18OLW and Δ18OBL with E. Therefore, the data collected here suggest that δ13CBL but not Δ18OBL may be an effective proxy for TE in C4 grasses.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Setaria
Stomatal conductance
C4 photosynthesis
carbon isotopic composition
Physiology
Setaria italica
Setaria Plant
stable isotopes
water limitation
Plant Science
drought
gas exchange
Oxygen Isotopes
01 natural sciences
03 medical and health sciences
Isotopic signature
oxygen isotopic composition
Leaf size
Transpiration
Carbon Isotopes
biology
δ13C
Setaria viridis
Chemistry
Water
Plant Transpiration
biology.organism_classification
Research Papers
Plant Leaves
030104 developmental biology
transpiration efficiency
Agronomy
Water use
010606 plant biology & botany
Photosynthesis and Metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 14602431 and 00220957
- Volume :
- 68
- Issue :
- 13
- Database :
- OpenAIRE
- Journal :
- Journal of Experimental Botany
- Accession number :
- edsair.doi.dedup.....e7d78c203f51797bab45a07e5e44f61d