Abstract
Genotypic and environmental (soil water regime and N level) variation in carbon isotope discrimination (CID) in relation to the gas exchange, transpiration efficiency (A/T), and biomass production were investigated in field experiments using eleven rice (Oryza sativa L.) genotypes. The results showed that genotype was more dominant for variation in CID than in total biomass. Genotypic ranking in CID was consistent across environments because of small genotype × environment interactions. Japonica genotypes tended to have lower CID than indica genotypes. Higher soil water and lower N rate significantly increased CID. Variation in CID was slightly smaller for water regime than for genotype. There was a negative correlation between CID andA/T among genotypes within water regimes. Genotypic variation in CID was associated mainly with variation in stomatal conductance under all soil water regimes and with photosynthetic capacity in late growth stages under aerobic soil conditions. The decrease in CID at higher N was probably due to lower stomatal conductance under aerobic soil conditions and to higher photosynthetic rates under submerged soil conditions. The correlation between biomass and CID was not clear in aerobic soil, whereas it was positive in submerged soil, which indicated that the significance of lower or higher CID for improving biomass productivity may differ under different soil water regimes. Overall, the results implied a possible use of CID as a selection criterion for genotypic improvement inA/T and productivity in rice.
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Abbreviations
- A :
-
net photosynthetic rate
- A/T :
-
transpiration efficiency
- Ci/Ca :
-
leaf intercellular CO2 concentration/ambient CO2 concentration ratio
- CID:
-
carbon isotope discrimination
- gs :
-
stomatal conductance
- HI:
-
harvest index
- SLW:
-
specific leaf weight
- T :
-
transpiration rate
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Kondo, M., Pablico, P.P., Aragones, D.V. et al. Genotypic variations in carbon isotope discrimination, transpiration efficiency, and biomass production in rice as affected by soil water conditions and N. Plant Soil 267, 165–177 (2004). https://doi.org/10.1007/s11104-005-4884-6
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DOI: https://doi.org/10.1007/s11104-005-4884-6