Genetic dissection and pyramiding of quantitative traits for panicle architecture by using chromosomal segment substitution lines in rice

To understand the genetic basis of yield-related traits of rice, we developed 39 chromosome segment substitution lines (CSSLs) from a cross between an average-yielding japonica cultivar, Sasanishiki, as the recurrent parent and a high-yielding indica cultivar, Habataki, as the donor. Five morphologi...

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Bibliographic Details
Published in:Theoretical and applied genetics 2008-04, Vol.116 (6), p.881-890
Main Authors: Ando, Tsuyu, Yamamoto, Toshio, Shimizu, Takehiko, Ma, Xiu Fang, Shomura, Ayahiko, Takeuchi, Yoshinobu, Lin, Shao Yang, Yano, Masahiro
Format: Article
Language:English
Subjects:
Agriculture
Biochemistry
Biological and medical sciences
Biomedical and Life Sciences
Biotechnology
Chromosome Mapping
Chromosomes
Chromosomes, Plant - genetics
Classical genetics, quantitative genetics, hybrids
Crosses, Genetic
Cultivars
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
Genomes
Life Sciences
Morphology
Original Paper
Oryza - genetics
Oryza - metabolism
Oryza sativa
Phenotype
Plant Biochemistry
Plant Breeding/Biotechnology
Plant Genetics and Genomics
Pteridophyta, spermatophyta
Quantitative Trait Loci
Quantitative Trait, Heritable
R&D
Research & development
Vegetals
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Summary:To understand the genetic basis of yield-related traits of rice, we developed 39 chromosome segment substitution lines (CSSLs) from a cross between an average-yielding japonica cultivar, Sasanishiki, as the recurrent parent and a high-yielding indica cultivar, Habataki, as the donor. Five morphological components of panicle architecture in the CSSLs were evaluated in 2 years, and 38 quantitative trait loci (QTLs) distributed on 11 chromosomes were detected. The additive effect of each QTL was relatively small, suggesting that none of the QTLs could explain much of the phenotypic difference in sink size between Sasanishiki and Habataki. We developed nearly isogenic lines for two major QTLs, qSBN1 (for secondary branch number on chromosome 1) and qPBN6 (for primary branch number on chromosome 6), and a line containing both. Phenotypic analysis of these lines revealed that qSBN1 and qPBN6 contributed independently to sink size and that the combined line produced more spikelets. This suggests that the cumulative effects of QTLs distributed throughout the genome form the major genetic basis of panicle architecture in rice.
ISSN:0040-5752
1432-2242
DOI:10.1007/s00122-008-0722-6