“…Several reports outline the possibilities ol mutant selection using in vitro eulture techniques (KE(.RUTIL-et al 1984, M,-\i.i(.,-\ 1984, INGRAM andMA<;;DOXAI,!I 1986). Recently, models for mutant .screening m plani suspen-.sion cuhures have been discussed (SIMONS et al 1984, P,\Li 1983. Resistance to environmental stress has already been obtained b)-application of eell eulture nicthod.s (PETOLINLI ,and Coi,i,iNs 1984, \' AN S>J-, -\AY et a,l.…”