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Theoretical and Applied Genetics

, Volume 116, Issue 5, pp 715–722 | Cite as

Detection of quantitative trait loci controlling extremely early heading in rice

  • Y. Nonoue
  • K. Fujino
  • Y. Hirayama
  • U. Yamanouchi
  • S. Y. Lin
  • M. Yano
Original Paper

Abstract

To clarify the genetic basis of extremely early heading in rice, we conducted quantitative trait locus (QTL) analyses using F2 populations from two genetically wide cross combinations, Hayamasari/Kasalath (HaF2) and Hoshinoyume/Kasalath (HoF2). Hayamasari and Hoshinoyume are extremely early-heading japonica cultivars. Photoperiod sensitivity is completely lost in Hayamasari and weak in Hoshinoyume. Three QTLs, QTL(chr6), QTL(chr7), and QTL(chr8), for days-to-heading (DTH) in HaF2 were detected on chromosomes 6, 7, and 8, respectively, and QTL(chr6) and QTL(chr7) were detected in HoF2. On the basis of the chromosomal locations, QTL(chr6), QTL(chr7), and QTL(chr8) may be likely to be Hd1, Hd4, and Hd5, respectively, which had been detected previously as QTLs for DTH in an F2 population of Nipponbare × Kasalath. Alleles of QTL(chr7) decreased DTH dramatically in both Hayamasari and Hoshinoyume, suggesting that QTL(chr7) has a major role in determining extremely early heading. In addition, allele-specific interactions were detected between QTL(chr6), QTL(chr7) and QTL(chr8). This result suggests that not only allelic differences but also epistatic interactions contribute to extremely early heading. QTL(chr8) was detected in HaF2, but not in HoF2, suggesting that it determines the difference in DTH between Hayamasari and Hoshinoyume. A major QTL was also detected in the region of QTL(chr8) in QTL analysis using an F2 population of Hayamasari × Hoshinoyume. This result supports the idea that QTL(chr8) is a major factor that determines the difference in DTH between Hayamasari and Hoshinoyume, and is involved in photoperiod sensitivity.

Keywords

Quantitative Trait Locus Quantitative Trait Locus Analysis Quantitative Trait Locus Mapping Epistatic Interaction Photoperiod Sensitivity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We thank Dr. Harumi Kikuchi, Hokkaido Central Agricultural Experiment Station, for providing seeds of Hoshinoyume and Hayamasari. This work was supported by the Agri-Bio Project (IP-1001) of the Ministry of Agriculture, Forestry and Fisheries of Japan.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Y. Nonoue
    • 1
  • K. Fujino
    • 2
  • Y. Hirayama
    • 3
    • 5
  • U. Yamanouchi
    • 4
  • S. Y. Lin
    • 1
    • 6
  • M. Yano
    • 4
  1. 1.Institute of Society for Techno-innovation of Agriculture, Forestry and FisheriesTsukubaJapan
  2. 2.Hokuren Agricultural Research InstituteNaganuma, YubariJapan
  3. 3.Hokkaido Prefectural Kamikawa Agricultural Experiment StationPippu, KamikawaJapan
  4. 4.National Institute of Agrobiological SciencesTsukubaJapan
  5. 5.Hokkaido Central Agricultural Experiment StationIwamizawaJapan
  6. 6.Honda Research Institute Japan Co., LtdKisarazuJapan

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