Identification of a novel gene ef7 conferring an extremely long basic vegetative growth phase in rice

Qingbo Yuan, Hiroki Saito, Yutaka Okumoto, Hiromo Inoue, Hidetaka Nishida, Takuji Tsukiyama, Masayoshi Teraishi, Takatoshi Tanisaka

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Abstract

A late heading-time mutant line, HS276, which was induced by gamma-irradiation of seeds of the japonica rice (Oryza sativa L.) variety Gimbozu, exhibits an extremely long basic vegetative growth phase (BVP). A genetic analysis using the F2 population from the cross between HS276 and Gimbozu revealed that the late heading of HS276 is governed by a single recessive mutant gene. The subsequent analysis on heading responses of HS276 and Gimbozu to four photoperiods (12, 13, 14, and 15 h) and to the photoperiodic transfer treatment from a short photoperiod to a long photoperiod revealed that the mutant gene confers an extremely long BVP and increases photoperiod sensitivity under long photoperiod (14 and 15 h). The BVP durations of HS276 and Gimbozu were estimated at 30.1 and 16.0 days, respectively; the mutant gene, compared with its wild type allele, elongates the duration of BVP by 14 days. Linkage analysis showed that the mutant gene is located in the 129 kb region between the two INDEL markers, INDELAP0399-6 and INDELAP3487-2, on the distal part of the short arm of chromosome 6. None of the other BVP genes are located in this region; therefore, we declared this a newly detected mutant gene and designated it ef7. A recently established program to breed rice suitable for low latitudes, where short photoperiodic conditions continue throughout the year, aims to develop varieties with extremely long BVPs and weak photoperiod sensitivities; the mutant gene ef7, therefore, will be quite useful in these programs because it confers an extremely long BVP and little enhances photoperiod sensitivity under short photoperiod.

Original languageEnglish
Pages (from-to)675-684
Number of pages10
JournalTheoretical and Applied Genetics
Volume119
Issue number4
DOIs
Publication statusPublished - Aug 1 2009

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ASJC Scopus subject areas

  • Biotechnology
  • Agronomy and Crop Science
  • Genetics

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