Biologia plantarum 56:451-457, 2012 | DOI: 10.1007/s10535-012-0119-x
Engineering ascorbic acid biosynthetic pathway in Arabidopsis leaves by single and double gene transformation
- 1 State Key Laboratory of Genetic Engineering, School of Life Sciences, Fudan-SJTU-Nottingham Plant Biotechnology R&D Center, Fudan University, Shanghai, P.R. China
- 2 Plant Biotechnology Research Center, School of Agriculture and Biology, Fudan-SJTU-Nottingham Plant Biotechnology R&D Center, Shanghai Jiao Tong University, Shanghai, P.R. China
Six genes, which encode enzymes involved in ascorbic acid (AsA) biosynthesis, including guanosine diphosphate (GDP)-mannose pyrophosphorylase (GMP), GDP-mannose-3',5'-epimerase (GME), GDP-galactose guanylyltransferase (GGT), L-galactose-1-phosphate phosphatase (GPP), L-galactose dehydrogenase (GDH) and L-galactono-1,4-lactone dehydrogenase (GLDH) were transformed into Arabidopsis thaliana, to evaluate the contribution of each gene to AsA accumulation. Additionally, two combinations, GGT-GPP and GGT-GLDH, were co-transformed into Arabidopsis with a reliable double-gene transformation system. AsA content of GGT transgenic lines was 2.9-fold higher as compared to the control, and co-transformation led up to 4.1-fold AsA enhancement. These results provided further evidence that GGT is the key enzyme in plant AsA biosynthesis.
Keywords: GDP-L-galactose guanyltransferase; transgenic plants; vitamin C
Subjects: GDP-L-galactose guanyltransferase; transgenic plants; ascorbic acid; PCR; transgenic plans; gene construct; ascorbic acid biosynthesis
Received: January 22, 2011; Accepted: May 16, 2011; Published: September 1, 2012 Show citation
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