Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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The Expression of a Cytosolic Fructose-1,6-Bisphosphatase, a Key Enzyme in Sucrose Biosynthesis, Gene was Diurnally Fluctuated and Increased in Cold Acclimated Leaves of Chinese Cabbage

  • Leen, Jeong-Yeo (Plant Genomic Institute, School of Bioscience and Biotechnology, Chungnam National University) ;
  • Song, Ha-Young (Plant Genomic Institute, School of Bioscience and Biotechnology, Chungnam National University) ;
  • Lim, Yong-Pyo (Plant Genomic Institute, School of Bioscience and Biotechnology, Chungnam National University) ;
  • Hur, Yoon-Kang (Plant Genomic Institute, School of Bioscience and Biotechnology, Chungnam National University)
  • Published : 2006.06.30
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Abstract

Chinese cabbage (Brassica rapa ssp. pekinesis) is one of the most important vegetable crops in korea and other East Asian countries. Cytosolic fructose-1,6-bisphospha-tase (cytFBPase) is a key enzyme in sucrose biosyn-thesis, which controls the sucrose levels as well as the productivity at plants. The Chinese cabbage cytFBPase gene, BrFBPase, encodes the 340 amino acid polypep-tide, giving a theoretical molecular weight of 37.2 kD and a isolectric point of 5.4. BrFBPase showed high sequence identity with Brassica homologs and its functional domains, such as 12,6P$_2$ binding site or active site and F6P binding site, were highly conserved in diverse sources of organisms. Although the genome of Chinese cabbage seemed to be triplicated, BrFBPase appears to be a single copy gene. The expression of BrFBPase was examined at transcript and protein levels under various conditions. BrFBPase expression was observed only in photosynthetic source tissue, not in sink tissue. The expression was slightly higher during the day than at night, and it showed a diurnal cycle with circadian rhythmicity. Short-term exposure to low temperature inhibited the expression of the BrFBPase, while long-term exposure increased the expression, supporting that sugar levels are high in late autumn when temperature are low.

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