Plant Molecular Biology

, Volume 39, Issue 4, pp 785–795 | Cite as

Enhanced expression and differential inducibility of soybean chalcone synthase genes by supplemental UV-B in dark-grown seedlings

  • Takeshi Shimizu
  • Shinji Akada
  • Mineo Senda
  • Ryuji Ishikawa
  • Takeo Harada
  • Minoru Niizeki
  • Shyam K. Dube


By developing gene-specific RT-PCR and using filters to allow transmission down to 290 nm (UV-B+) or blocking all radiation below 320 nm (UV-B−), the effect of UV-B+ and UV-B− light on expression of each of the presently known seven members of soybean chalcone synthase (CHS) gene family in dark-grown seedlings was analyzed. Dark expression was detectable already in 18 h dark-germinating embryos, with progressive increases on successive days, suggesting that chs belongs to a class of genes expressed very early during germination, and that the expression at this stage is either constitutive or induced by non-light-dependent factors present in the seed or made available following imbibition. Exposure of 18 h dark-germinating embryos to UV-B− or to UV-B+ light did not lead to an increase in chs signal. However, the 24 h dark-germinating embryos showed a distinct effect of UV-B+, interestingly coinciding with the stage when the head of seedlings was in the process of being pushed up above ground by stem elongation, suggesting the possibility of a developmental switch modulating the appearance of UV-B response. The response to UV-B− was most prominent in chs1 and almost silent in chs2, while the up-regulation by UV-B+ was most prominent in chs5 and chs6 and much less so in chs2. Interestingly, chs2 was noted to be the only member of the Gmchs gene family devoid of H-box, raising the possibility that the H-box may be a good indicator of the photo-inducibility of a chs gene.

UV-B soybean chalcone synthase gene expression 


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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Takeshi Shimizu
    • 1
  • Shinji Akada
    • 2
  • Mineo Senda
    • 2
  • Ryuji Ishikawa
    • 1
  • Takeo Harada
    • 1
  • Minoru Niizeki
    • 1
  • Shyam K. Dube
    • 3
  1. 1.Plant Breeding Laboratory, Faculty of AgricultureHirosaki UniversityHirosakiJapan
  2. 2.Gene Research CenterHirosaki UniversityHirosakiJapan
  3. 3.Center for Agricultural BiotechnologyUniversity of Maryland Biotechnology InstituteCollege ParkUSA

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