Application of plant growth regulators for intensification of biomass growth and increase of polyfructan amount in the chicory "hairy" root cultures - N. A. Matvieieva; V. A. Tsyhankova; S. O. Chapkevych; M. V. Kuchuk; S. P. Ponomarenko (Bulletin of Ukrainian Society of Geneticists and Breeders, 2012)