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1·Effects of basal culture medium, sucrose concentration, natural extracts and phytohormones on protocorm differentiation were studied.

试验了基本培养基、蔗糖浓度、天然提取物以及植物激素对铁皮石斛原球茎分化的影响。

2·Influence of different mass concentration of 2, 4-d on callus induction in maize inbred line 4112 from immature embryos with MS being used as basal culture medium was studied.

以玉米自交系4112的幼胚为外植体，以MS为基本培养基，研究了不同质量浓度的2,4 - D对愈伤组织诱导的影响。

3·The results showed that the effects of basal medium, IBA and dark or light culture were significant at 1% level.

结果表明基本培养基、IBA和光暗培养是影响试管苗产生不定根的主要因素。