Abstract: Karyotype analysis was performed to investigate the chromosome features of 6 banana （Musa spp.） cultivars in relation to A genomes by using the method of wall degradation hypotonic. Results showed that the analysed cultivars of diploid or triploid that contained only A genomes，viz. AA or AAA，varied in karyotype characteristics. The karyotype formula and its type were 2n = 3x = 33 = 3M + 27m（3SAT）+ 3sm and“1A”for‘Tianbaojiao’（AAA），2n = 2x = 22 = 2M + 18m（2SAT）+ 2sm and“2A”for’Hainan Gongjiao’（AA），respectively. The karyotype formula for‘Rose’（AA），‘Pisang Mas’（AA），‘Kangku 1’（AAA）and‘Kangku 5’（AAA）were 2n = 2x = 22 = 2M + 16m（SAT）+ 2sm + 2st，2n = 2 x = 22 = 4M + 16m（SAT）+ 2sm，2n = 3x = 33 = 6M + 15m（3SAT）+ 12sm，2n = 3 x = 33 = 6M + 15m（3SAT）+12sm（3SAT），respectively，whereas all these four cultivars exhibited a karyotype asymmetry of type“2B”. The idiogram was established for the analysed banana cultivars.

Key words: Musa, chromosome features, karyotype analysis