Journal
RICE
Volume 3, Issue 1, Pages 72-86Publisher
SPRINGER
DOI: 10.1007/s12284-010-9036-9
Keywords
Water use efficiency; Carbon isotope discrimination; Oryza sativa
Categories
Funding
- National Science Foundation [DBI-0110069]
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Carbon isotope discrimination (Delta C-13) is considered as an index of leaf-level water use efficiency, an important objective for plant breeders seeking to conserve water resources. We report in rice a genetic analysis for Delta C-13, leaf structural parameters, gas exchange, stomatal conductance, and leaf abscisic acid (ABA) concentrations. Doubled haploid and recombinant inbred populations, both derived from the cross IR64 x Azucena, were used for quantitative trait locus (QTL) analysis following greenhouse experiments Delta C-13 QTLs on the long arms of chromosomes 4 and 5 were colocalized with QTLs associated with leaf blade width, length, and flatness, while a QTL cluster for Delta C-13, photosynthesis parameters, and ABA was observed in the near-centromeric region of chromosome 4. These results are consistent with phenotypic correlations and suggest that genetic variation in carbon assimilation and stomatal conductance contribute to the genetic variation for Delta C-13 in this population.
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