Induction of double flowers in Pharbitis nil using a class-C MADS-box transcription factor with Chimeric REpressor gene-Silencing Technology

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概要

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• The Chimeric REpressor gene-Silencing Technology (CRES-T) system is a novel reverse genetic method using a chimeric transcriptional repressor fusing an EAR transcriptional repression domain called SRDX. We sought to change the flower shape of Pharbitis nil, a model ornamental flower, using an Arabidopsis transcription factor fused with SRDX. For the first trial modulating flower shape we transformed with the class-C MADS-box transcription factor AGAMOUS (AG) fused with SRDX (AGSRDX). Defects in class-C genes cause double flowers in Arabidopsis and Pharbitis. However, when AGSRDX was expressed under the CaMV 35S promoter (p35S), the transgenic Pharbitis bore a malformed flower with a protruding pistil. We then used DUPLICATED (DP), one of the class-C genes in Pharbitis. The p35S::DPSRDX-introduced callus were difficult to regenerate during transgenic steps, but occasionally made a perfect double flower bud showing severe growth defects. The flower buds never developed to flower opening stage. These results indicate that CRES-T is functional in Pharbitis but even using a conserved transcription factor, some species-specific variation might exist. To avoid these unwanted effects, we recruited inducible promoters to control expression of the chimeric transcription repressors in combination with the DNA-binding domain of GAL4 in yeast fused with SRDX and the GAL4 upstream activator sequence (UAS). Normal regeneration was observed by inducible repression of DPSRDX during in vitro redifferentiation, and the double-flowered Pharbitis was generated. We successfully induced a non-transformant (NT)-like flower in DPSRDX-expressing double-flowered transformants. Our approach will enable us to breed transgenic horticultural plants with inducible fertility.

• 2011-03-25

著者

• 小野 道之

  Graduate School Of Life And Environmental Sciences University Of Tsukuba

• Ohme Takagi

  Research Institute Of Genome-based Biofactory National Institute Of Advanced Industrial Science And

• Higashi K

  Gene Research Center Institute Of Biological Sciences University Of Tsukuba

• SAGE ONO

  Graduate School of Life and Environmental Sciences, University of Tsukuba

• Kamada H

  Gene Res. Center Graduate School Of Life And Environmental Sciences Univ. Of Tsukuba

• HIGUCHI Yohei

  Graduate School of Life and Environmental Sciences, University of Tsukuba

• Sage Ono

  Graduate School Of Life And Environmental Sciences University Of Tsukuba

• Sage Ono

  Gene Experiment Center Institute Of Biological Sciences University Of Tsukuba

• Higuchi Youhei

  Univ. Tsukuba Ibaraki Jpn

• Kamada Hiroshi

  Gene Experiment Center University Of Tsukuba

• Ono Michiyuki

  Gene Research Center Graduate School Of Life And Environmental Sciences University Of Tsukuba

• Hayashi Yoriko

  Riken Saitama Jpn

• Higuchi Youhei

  Gene Research Center Graduate School Of Life And Environmental Sciences University Of Tsukuba

• Kawaide Hiroshi

  Institute Of Symbiotic Science And Technology Tokyo University Of Agriculture And Technology

• Ohme Takagi

  Research Institute Of Genome-based Biofactory National Institute Of Advanced Industrial Science And

• Ono Michiyuki

  Gene Res. Center Graduate School Of Life And Environmental Sciences Univ. Of Tsukuba

• Sage-ono Kimiyo

  Gene Res. Center Graduate School Of Life And Environmental Sciences Univ. Of Tsukuba

• Ozeki Yuko

  Gene Research Center, Graduate School of Life and Environmental Sciences, University of Tsukuba

• Hiyama Satomi

  Gene Research Center, Graduate School of Life and Environmental Sciences, University of Tsukuba

• Higuchi Yohei

  National Inst. Of Floricultural Sci. National Agriculture And Food Res. Organization (naro)

• Mitsuda Nobutaka

  Research Institute Of Genome-based Biofactory National Institute Of Advanced Industrial Science And

• Mitsuda Nobutaka

  Bioproduction Research Institute National Institute Of Advanced Industrial Science And Technology

• Hiyama Satomi

  Gene Research Center Graduate School Of Life And Environmental Sciences University Of Tsukuba

• Ozeki Yuko

  Gene Research Center Graduate School Of Life And Environmental Sciences University Of Tsukuba

• Kamada Hiroshi

  Gene Res. Center Graduate School Of Life And Environmental Sciences Univ. Of Tsukuba

• Kamada Hiroshi

  Gene Exp. Center Univ. Tsukuba

• SAGE-ONO Kimiyo

  Gene Experiment Center, Institute of Biological Sciences, University of Tsukuba

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