摘要
由兰科植物铁皮石斛(Dendrobium candidum Wall.ex Lindl.)种子诱导形成的愈伤组织,在光照下置于MS附加0.3 m g/LNAA 的培养基上繁殖,可以形成原球茎。将原球茎转入MS含2 m g/L 6-BA 和0.5 m g/LNAA 的培养基上,花芽形成频率为27.0% 。原球茎先在0.5 m g/LABA的培养基上预培养15 d,再转入含2 m g/L6-BA 的MS培养基上培养,花芽形成频率明显提高,可达84.4% ,而且每株植株花的数目增加;但是在仅有ABA
An in vitro flowering system of Dendrobium candidum Wall. ex Lindl., a wild species of orchid, was established. Callus was induced from seeds and protocorms formed on MS agar medium supplemented with 0.3 mg/L NAA under diffused light. Floral buds were induced when protocorms were cultured on MS agar medium supplemented with 2 mg/L 6 BA and 0.5 mg/L NAA, the frequency of floral bud induction being 27.0%. When protocorms were precultured on MS medium supplemented with 0.5 mg/L ABA for 15 days and then transfered onto MS medium supplemented with 2 mg/L 6 BA, the frequency of floral bud induction increased greatly reach 84.0% during a period of 5 months. Meanwhile the number of branches and floral buds also increased and in some instances inflorescence appeared. Never the less, no floral bud was formed if protocorms continued to be cultured on the ABA containing MS medium.