Object To optimize the fitting culture media for multiplication of adventitious bud and ra-dication of Dendrobium candidum Wall. ex Lindl. and the length of adventitious bud for succesive transfer multiplication. Methods In the same culture condition, the adventitious bud with different length developed in the various culture media for multiplication and radication. Facing the different growth status, the diversity test and general analysis were carried on for them. Results There were significant difference in different length of adventitious bud, difference between the multiplication and radication of culture media. Conclusion The adventitious buds in (1.2?0.1) cm length are superior for succesive transfer multiplication, MS adding BA 1.0 mg/L, NAA 0.2 mg/L is the best media for the adventitious buds multiplication, 1/2 MS adding NAA 0.2 mg/L is the test media for radication.

Objective The transgenic Atractylodes macrocephala resistance to Rhizoctonia solani was obtained by gene engineering. Methods On the base of the efficient regeneration system of Baizhu via shoot organogenesis, the rice chitinase gene (RCH10) and the alfalfa ?-1, 3-glucanase gene (AGLU) were tandem-inserted into the transformation vector pB101, which was transformed into A. macrocephala with gene gun. Transformants were confirmed by PCR, GUS assay, and disease resistant. Results Twenty-five independent transformants possessed desired genes were observed by PCR detection, and among them five transformants exhibiting resistance to Rhizoctonia solani. Conclusion The disease resistant variety has been obtained by transformation, which provides a shorten avenue for the direct introduction of novel traits into A. macrocephala through genetic engineering without the need for numerous back-crossing in breeding programs that slow down cultivar improvement, meanwhile it improves disease resistant gene pool.