fructan beet

The biochemistry of fructan synthesis has been determined,
and the first genes encoding these biosynthetic
enzymes have recently been cloned, opening new biotechnological
opportunities for the use of fructans. Until now
the major obstacles have been the limited availability of
long-chain fructans and the heterogeneity of harvested
fructans. It will now be possible to genetically engineer
plants to produce large quantities of fructans of defined
structure and size. here

Microbial fructan production in transgenic potato plants and tubers
here