Abstract
Adventitious shoots were regenerated from stem segments or leaf discs of hazelnut (Corylus species) in vitro shoot cultures. Five to 10% of stem segments of `Nonpareil' regenerated adventitious shoots on modified MS medium and NCGR-COR medium supplemented with 200 mg·1-1 glutamine and combination of 1 or 5 μM thidiazuron (TDZ) and 0.1 μM naphthaleneacetic acid (NAA). Callus derived from stem segments of `Nonpareil', `Tonda Gentile Romana', and `Willamette' and leaf discs of `Dundee' cultured on medium with TDZ and NAA also produced shoots (buds) after transfer to NCGR-COR medium or modified MS medium with benzyladenine (BA) and indole-3-butyric acid (IBA). Adventitious roots were produced from leaf discs and stem segments on medium with NAA alone or with high levels of IBA or NAA combined with low levels of BA. Regenerated shoots of `Nonpareil' and `Willamette' were multiplied, rooted, and acclimatized in the greenhouse. This provides a starting point for improving the plant regeneration frequency to a level useful for genetic manipulation.
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