Transgenic Research

, Volume 14, Issue 5, pp 619–626

Over-expression of Chinese Cabbage Calreticulin 1, BrCRT1, Enhances Shoot and Root Regeneration, But Retards Plant Growth in Transgenic Tobacco

Authors

  • Zheng-Lu Jin
    • Division of Applied Life Science (BK21), Environmental Biotechnology Research Center and PMBBRCGyeongsang National University
  • Joon Ki Hong
    • Division of Applied Life Science (BK21), Environmental Biotechnology Research Center and PMBBRCGyeongsang National University
  • Kyung Ae Yang
    • Division of Applied Life Science (BK21), Environmental Biotechnology Research Center and PMBBRCGyeongsang National University
  • Ja Choon Koo
    • Division of Molecular Life SciencePohang University of Science and Technology
  • Young Ju Choi
    • Department of Food and NutritionSilla University
  • Woo Sik Chung
    • Division of Applied Life Science (BK21), Environmental Biotechnology Research Center and PMBBRCGyeongsang National University
  • Dae-Jin Yun
    • Division of Applied Life Science (BK21), Environmental Biotechnology Research Center and PMBBRCGyeongsang National University
  • Sang Yeol Lee
    • Division of Applied Life Science (BK21), Environmental Biotechnology Research Center and PMBBRCGyeongsang National University
  • Moo Je Cho
    • Division of Applied Life Science (BK21), Environmental Biotechnology Research Center and PMBBRCGyeongsang National University
    • Division of Applied Life Science (BK21), Environmental Biotechnology Research Center and PMBBRCGyeongsang National University
Article

DOI: 10.1007/s11248-005-5694-6

Cite this article as:
Jin, Z., Hong, J.K., Yang, K.A. et al. Transgenic Res (2005) 14: 619. doi:10.1007/s11248-005-5694-6

Abstract

Calreticulin (CRT) is a ubiquitously expressed, high capacity Ca2+-binding protein that is involved in intracellular Ca2+ homeostasis and molecular chaperoning in the endoplasmic reticulum (ER). A cDNA encoding a calreticulin, BrCRT1 (Brassica rapa Calreticulin 1), has been isolated from Chinese cabbage (B. rapa subsp. pekinensis) flower bud. Constitutive over-expression of the BrCRT1 gene promotes robust shoot production and root formation at sub-optimal concentrations of BA/NAA, which are important factors controlling plant regeneration in tissue culture. In contrast, the suppressed BrCRT1 line exhibited a slight reduction of shoot and root regeneration. In spite of enhanced regeneration in tissue culture, the seedling and plant growth rate was inhibited in soil. The steady state level of BrCRT1 transcripts was sensitive to exogenous auxins and cytokinins, and rapidly accumulated within 30 min, and this induction required de novo protein synthesis. Together with the results of transgenic tobacco plants and mRNA analysis in Chinese cabbage, our data suggest that BrCRT1 genes may up-regulate the competency of vegetative tissue to respond to hormonal signals involved in shoot and root regeneration processes.

Keywords

Chinese cabbagegene expressionhormonal responseorganogenesis
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Copyright information

© Springer 2005