CYTOGENETIC INSTABILITY AMONG THE VEGETATIVE PROGENIES OF ASPERGILLUS-REPENS CV PURDUE SOMACLONES

The distribution of mitotic chromosome numbers and changes in the meio tic chromosome pairing in the vegetative progenies of Agropyron repens cv. Purdue somaclones were analyzed. Mitotic chromosome variability s howed an increase at both cell (SC1-3 somaclones) and plant (SC2) leve l. Nevertheless: from the progenies of the somaclone SC2, a stable hip oploid clone with a chromosome number of 2n = 38 was selected. The num bers of aneuploid cells in the root tips of vegetative clones also sho wed an increase. In the analysis of meiotic chromosome pairing, a shif t towards the appearance of multivalents (quadrivalents, hexavalents, octovalents) was observed.