The individual shoot buds with two expanded leaves of P. delenatii and P. callosum were cultured on a basic medium containing haft-strength of micro- and macro-MS and full-strength of vitamin MS supplemented with CW, NaH2PO4, oligochitosan and NAA.The 6-week data presented in Table 4 indicated that the supplementation of NaH2PO4and oligochitosan promoted shoot and root elongation of in vitro plantlets.