Genetic analysis of water use efficiency in rice (Oryza sativa L.) at the leaf level

Carbon isotope discrimination (∆13C) 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 ∆13C, 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 × Azucena, were used for quantitative trait locus (QTL) analysis following greenhouse experiments. ∆13C 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 ∆13C, 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 ∆13C in this population.

Bibliographic Details

Main Authors:	This, D., Comstock, J., Courtois, B., Yunbi Xu, Ahmadi, N., Vonhof, W.M., Fleet, C., Setter, T.L., McCouch, S.
Format:	Article biblioteca
Language:	English
Published:	Springer Nature 2010
Subjects:	AGRICULTURAL SCIENCES AND BIOTECHNOLOGY, Carbon Isotope Discrimination, WATER USE EFFICIENCY, CARBON 13, ISOTOPE ANALYSIS, ORYZA SATIVA,
Online Access:	http://hdl.handle.net/10883/1843
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