Five desynaptic mutants isolated in M2confirmed in M3and cytologically analyzed in M4have been investigated. Two of these (DS1and DS2) were isolated in the cv. Cappelli after seed treatment with Ethylmethansulphonate (EMS), and thermal neutrons respectively. The other three (DS3, DS4and DS5) were isolated in the cv. Aziziah after seed treatment with thermal neutrons, EMS and fast neutrons, respectively.