Detection of a quantitative trait locus controlling carbon isotope discrimination and its contribution to stomatal conductance in japonica rice

Increasing leaf photosynthesis offers a possible way to improve yield potential in rice (Oryza sativa L.). Carbon isotope discrimination (Δ¹³C) has potential as an indirect selection criterion. In this study, we searched for quantitative trait loci (QTLs) controlling Δ¹³C, and assessed their associa...

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Bibliographic Details
Published in:Theoretical and applied genetics 2009-05, Vol.118 (7), p.1401-1410
Main Authors: Takai, Toshiyuki, Ohsumi, Akihiro, San-oh, Yumiko, Laza, Ma. Rebecca C, Kondo, Motohiko, Yamamoto, Toshio, Yano, Masahiro
Format: Article
Language:English
Subjects:
Agricultural production
Agriculture
Biochemistry
Biological and medical sciences
Biomedical and Life Sciences
Biotechnology
Carbon
Carbon Isotopes - metabolism
Chromosome Mapping
Chromosomes
Chromosomes, Plant
Classical genetics, quantitative genetics, hybrids
Crop science
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
Genomes
Life Sciences
Lod Score
Original Paper
Oryza - cytology
Oryza - genetics
Oryza - physiology
Oryza sativa
Photosynthesis
Photosynthesis - genetics
Plant Biochemistry
Plant Breeding/Biotechnology
Plant Genetics and Genomics
Plant Stomata - metabolism
Pteridophyta, spermatophyta
Quantitative Trait Loci
Random Allocation
Rice
Vegetals
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Summary:Increasing leaf photosynthesis offers a possible way to improve yield potential in rice (Oryza sativa L.). Carbon isotope discrimination (Δ¹³C) has potential as an indirect selection criterion. In this study, we searched for quantitative trait loci (QTLs) controlling Δ¹³C, and assessed their association with leaf photosynthesis. Substitution mapping by using chromosome segment substitution lines (CSSLs), that carry segments from the indica cultivar Kasalath in the genetic background of the japonica cultivar Koshihikari, identified genomic regions affecting Δ¹³C on chromosomes (Chr.) 2, 3, 6, 7, and 12. One of the CSSLs, SL208, in which most regions on Chr. 3 were substituted with Kasalath segments, showed higher leaf stomatal conductance for CO₂ (g s) and Δ¹³C than Koshihikari during the vegetative stage although leaf photosynthetic rate did not differ between them. These results suggest an association between Δ¹³C and g s. To test this association, we performed a QTL analysis for Δ¹³C at vegetative and heading stages in an F₂ population derived from a cross between SL208 and Koshihikari. The results confirmed a QTL controlling Δ¹³C on the long arm of Chr. 3. By using a near-isogenic line specific to Hd6, we ruled out the possibility that variation in Δ¹³C was generated through the pleiotropic effect of heading date.
ISSN:0040-5752
1432-2242
DOI:10.1007/s00122-009-0990-9