Abstract: The genetic stability of papaya propagating plantlets was studied through cytological and morphological approachs. Primary observation and accountment were holded on chromosome numbers of propagating plantlets of papaya , Solo
I , which is major species of Hainan province from1 to 38 generations, the results showed that the numbers of chromosome are all 18 (2n = 18) from 1 to 32 generations . In addition there were no difference compared with their parents when they were planted in fields . The cells which chromosome were non-integral were found in the leaves of 33rd and 36th and 37th generation, and the fructiferous rate and anti-virus character of them were dropped when the plantlets were planted in field. This showed that there was some difference in the level of cell chromosome after cultured continuously 32nd generation. This result could give somevaluable theoretic reference to the tissue culture and industrialized produce of papayapropagating plantlets.

Key words: Carica papaya propagating plantlets