Jf. Xu et al., SUSPENSION-CULTURE OF COMPACT CALLUS AGGREGATE OF RHODIOLA-ACHALINENSIS FOR IMPROVED SALIDROSIDE PRODUCTION, Enzyme and microbial technology, 23(1-2), 1998, pp. 20-27
Some level of cellular or tissue differentiation is needed for the bio
synthesis of many important compounds in plant cell cultures. The cult
ure of compact callus aggregates (CCA) consisting of spherical, smooth
-surfaced clumps of 2-7 mm in diameter displaying some level of cellul
ar and tissue differentiation was initiated from the stems of R. sacha
linensis. Histochemical analysis showed that the CCA were structurally
organized to facilitate nutrient transport. The kinetics for CCA grow
th and salidroside synthesis were measured in shake flasks. it was fou
nd that a short phase of exponential growth (mu = 0.137 day(-1)) and a
relatively long phase of linear growth (growth rate = 0.60 g day(-1)
l(-1) predominated over most of the the culture cycle. The salidroside
yield of CCA after 24 days of culture was 0.68% on a dry weight basis
, approximately six times as much as that of the dispersed cells; howe
ver, the growth rate of CCA was comparable to that of the dispersed ce
lls. The CCA suspension culture was also successfully carried out ill
a 5-l airlift bioreactor. The yield of salidroside was similar to that
of shake-flask cultures though the biomass was relatively small. No f
oam buildup occurred in the reactor Since rite medium remained almost
clear throughout the culture cycle. (C) 1998 Elsevier Science Inc.