ABSTRACT
Objective To study asymbiotic seed germination and mass propagation of Dendrobium lasianthera which is one of the endangered medicinal orchids using seeds. Methods The 14 weeks old hand pollinated seeds were sown on Vacin and Went (VW) solid medium supplemented with various concentrations of peptone (1, 2, 3 g/L) and without peptone which was used as control treatment. At the 4, 8, and 12 weeks after the seeds were sown, seed germination and shoot formation were investigated. To evaluate the role of organic nutrient additives on subsequent shoot development and root formation, particular shoots with about 1 cm length contains 1–2 leaves obtained from the seeds germination was cultured on VW medium additives with different of organic nutrient: 15% coconut water, 2 g/L peptone, 150 g/L banana homogenate, and without organic nutrient was used as control. After 16 weeks of culture, the plantlet height, number of leaves, number of roots, leaf length and root length were recorded. Results The supplementation of 2 g/L peptone in VW medium was proven to be suitable concentration for seed germination (100%) and shoot formation with 84.0% the protocorm development to phase 5 (shoot). VW medium containing 15% coconut water was effectively improved the shoot development, with well developed roots and leaves compared to the other treatment and 95% of acclimatized plantlets survived. Conclusions This protocol is an efficient way for the in vitro mass propagation of this Dendrobium lasianthera.
ABSTRACT
Objective: To increase biomass and saponin production in hairy root culture of Talinum paniculatum Gaertn. (T. paniculatum) in balloon-type bubble bioreactor (BTBB). Methods: Hairy roots which were collected from leaf explants of T. paniculatum were infected by Agrobacterium rhizogenes strain LB510. The hairy roots were cultivated at 400 mL Murashige and Skoog liquid medium without growth regulator (MS0) in 1. 000 mL BTBB. Each BTBB had 2 g hairy roots as initial inoculum and these cultures were treated with various concentrations of sucrose (3%, 4%, 5%, 6% w/v) and potassium nitrate (0.5, 1.0, 1.5 and 2.0 strength of MS medium). Cultures were maintained for 14 days. Fresh and dry weights of hairy roots at the end of culture were investigated. Results: Various concentrations of sucrose influenced the biomass accumulation of hairy roots. Maximum biomass was reached by MS medium supplemented with 6% sucrose and it was approximately threefold higher than control. Culture supplemented with potassium nitrate at 2.0 strength of MS0 could increase biomass accumulation of hairy roots until 0.14 g dry weight and it was almost threefold higher than control. However, the maximum saponin content was obtained by MS medium supplemented with 5% sucrose and 2.0 strength potassium nitrate of MS. Conclusions: Based on this research, those conditions can be used to produce biomass and saponin of hairy root of T. paniculatum in the large scale.