Theoretical and Applied Genetics

, Volume 111, Issue 2, pp 393–398 | Cite as

Mapping of QTLs conferring extremely early heading in rice (Oryza sativa L.)

  • Kenji Fujino
  • Hiroshi Sekiguchi
Original Paper


Two genes related to extremely early heading were identified in populations derived from crosses between Hoshinoyume, a variety adapted to the northernmost limit of rice cultivation (Hokkaido), and Nipponbare, a variety adapted to the temperate region of Japan. The segregations for heading date clearly revealed that a two-gene model determined the extremely early heading in the F2 and BC1F1 populations under natural field conditions in Hokkaido. Using molecular markers corresponding to ten known quantitative trait loci (QTLs) for heading date, we carried out QTL analysis in the BC1F1 population and detected two QTLs, qDTH-7-1 and qDTH-7-2, both on chromosome 7, and observed epistatic interaction between them. We conclude that the recessive alleles of these two genes contribute to extremely early heading for the adaptation to Hokkaido environment and to stable rice production in Hokkaido. The relationships between the two QTLs identified in this study and known QTLs are discussed.


Quantitative Trait Locus Simple Sequence Repeat Marker Epistatic Interaction Rice Cultivation BC1F1 Population 
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.



We thank Ms. Seiko Okubo (Hokkaido Green-Bio Institute) for her technical assistance with DNA marker analysis.


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Hokkaido Green-Bio InstituteHokkaidoJapan

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