Increase in ascorbate content of transgenic tobacco plants overexpressing the acerola (Malpighia glabra) phosphomannomutase gene.

Phosphomannomutase (PMM; EC 5.4.2.8) catalyzes the interconversion of mannose-6-phosphate to mannose-1-phosphate in the Smirnoff-Wheeler pathway for the biosynthesis of l-ascorbic acid (AsA). We have cloned the PMM cDNA from acerola (Malpighia glabra), a plant containing an enormous amount of AsA. The AsA contents correlate with the PMM gene expression of… CONTINUE READING