Observation on chromosome number of 18 seeeedlings derived from pear cultivars Dayali×Dananguoli was made by Removal of Cell Wall and Hypotonic method and it was found that 1 seedling,5.6% of the total seedlings,was tetraploid (2 n =4 x =68);13 seedlings,72.2% of the total seedlings,were triploid (2 n =3 x =51);4 seedlings ,22.2% of the total seedlings,were diploid (2 n =2 x =34).The percentage of polyploid produced from this hybridized combination was 77.8%,which has shown that hybridized combi...