盾叶薯蓣成熟叶片植株再生的研究

目的 :以成熟叶片为外植体 ,建立一套盾叶薯蓣Dioscoreazingiberensis的快速繁殖技术。方法 :以大量元素减半的MS培养基为基本培养基 ,通过研究BA ,NAA和IBA对愈伤组织诱导、不定芽分化、不定芽增殖和生根的影响找出相应的最佳激素组合。结果与结论 :在含 1.0～ 5 .0mg·L^-1BA和 1.0～ 2 .0mg·L^-1NAA的培养基上 ,80 %以上的叶片可以在 60d内形成愈伤组织 ;愈伤组织转到含 2 .0～ 5 .0mg·L-1BA和 0 .2～ 0 .5mg·L^-1NAA的培养基上后 ,60 %以上的愈伤组织可以在 50d内分化出不定芽 ;在含 2 .0mg·L-^-1IBA的培养基上 ,100 %的不定芽可在20d内长出 4～ 6条不定根。再生植株移栽后 ,生长健壮 ,成活率达 80 %以上。

Studies on plantlet regeneration from the mature leaves of Dioscorea zingiberensis

OBJECTIVE: To establish a protocol of rapid clonal propagation of Dioscorea zingiberensis using mature leaves as explants. METHOD: Out the optimal hormone combinations for callus induction, adventitious bud initiation, adventitious bud multiplication and rooting were found out by using MS medium with the macroelements at half strength as basal medium and studying the effects of BA, NAA and IBA on the processes. RESULT AND CONCLUSION: More than 80% of leaf explants formed callus when they were cultured on the media containing 1.0 - 5.0 mg x L(-1) BA and 1.0 - 2.0 mg x L(-1) NAA for 60 days; more than 60% of calli initiated adventitious buds within 50 days after they were transferred to the media containing 2.0 - 5.0 mg x L(-1) BA and 0.2 - 0.5 mg L(-1) NAA; all the adventitious buds rooted well after they were planted on the medium with 2.0 mg x L(-1) IBA for 20 days; the regenerated plantlets grew vigorously after they were transplanted and the survival rate was up to 80%.