Micropropagation of Cotoneaster wilsonii Nakai—a rare endemic ornamental plant
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A simple and efficient micropropagation system was developed for Cotoneaster wilsonii through node and shoot tip explants obtained from mature field-grown plants. Of the two explants, node explants were found to be the most effective for axillary shoot proliferation. The highest frequency of shoot induction was achieved when nodal explants were incubated on Murashige and Skoog (MS) medium supplemented with 0.5 mg L−1 thidiazuron (TDZ) and 0.1 mg L−1 α- naphthaleneacetic acid (NAA) with an average of 34 shoots per explant. The microshoots were separated from the multiple shoots and subcultured on MS medium supplemented with 3% (w/v) sucrose and 0.8% (w/v) agar for further shoot growth. Maximum rooting was obtained on half-strength MS medium supplemented with 0.5 mg L−1 indole-3-butyric acid (IBA). The in vitro-grown plantlets were successfully acclimatized in a glasshouse with 98% of survival. High concentrations of TDZ (1.5–2.0 mg L−1) and repeated subcultures resulted hyperhydric shoots. Supplementation of the culture medium with silicon significantly reduced the induction of hyperhydric shoots. Increasing silicon concentration significantly decreased malondialdehyde content of the regenerated shoots. Data indicate that addition of silicon to the culture medium can effectively control hyperhydricity.
KeywordsEndangered species Hyperhydricity In vitro propagation Malondialdehyde Silicon Thidiazuron
Energy Dispersive X-ray Analysis
Murashige and Skoog medium
α- Naphthaleneacetic acid
Scanning Electron Microscopy
This research was supported by Technology Development Program for Agriculture and Forestry, Ministry for Food, Agriculture, Forestry and Fisheries, Republic of Korea. Project No: 109096-5. Iyyakkannu Sivanesan and Ju Yeon Song were supported by a scholarship from the BK21 Program, the Ministry of Education, Science and Technology, Korea.
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