Abstract

Interactions of varying ancymidol concentrations with those of α-naphthaleneacetic acid (NAA) or sucrose in embryo induction medium were related to the production and development of asparagus (Asparagus officinalis L.) somatic embryos, and to the ability of these embryos to germinate. A significant sucrose×ancymidol interaction was observed only for the production of bipolar embryos; 4% sucrose with 0.75 mg l-1 ancymidol gave the best result, 78 g-1 callus. The frequency of globular embryos decreased as sucrose or ancymidol concentrations increased. Sucrose concentration affected embryo germination; 3% and 4% sucrose were optimal with approximately 60% and 40% of bipolar and globular embryos germinating, respectively. Significant ancymidol×NAA interactions were observed for the production of bipolar and globular embryos and their germination. Varying ancymidol concentrations affected embryo production and germination in combination with 0.1 mg l-1 NAA, but not with 1.0 mg l-1 NAA. The treatment combination of 0.1 mg l-1 NAA with 0.75 mg l-1 ancymidol produced the most bipolar embryos, 64 g-1 callus, and the greatest percentages of bipolar and globular embryos germinated, 63% and 42%, respectively.

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