Determining levels of resistance to Tulip Breaking Virus (TBV) in tulip (Tulipa L.) cultivars

Summary The resistance of seven tulip cultivars to tulip breaking virus (TBV) was studied after mechanical inoculation by determining the number of infected plants and the level of virus in these plants over a period of one and a half years. Three cultivars (Apeldoorn, Kees Nelis and Lustige Witwe) appeared to be susceptible. Four cultivars (Cantata, Juan, Madame Lefeber and Princeps) showed a high degree of resistance. The number of infected plants of the latter cultivars was low and virus could not always be detected in the plants at the different sampling dates. Virus could not be detected in these plants after storage. These results indicate that the virus may disappear from or was not detectable in these plants. The levels of infection found are discussed with respect of its significance in studies of TBV in tulips.     

郁金香鳞茎愈伤组织的诱导研究

为提高郁金香鳞茎愈伤组织的诱导频率，以郁金香栽培品种“Ｇｕｄｏｓｈｎｉｋ”的鳞茎为材料，对影响郁金香鳞茎愈伤组织形成的几个主要因素进行了研究．结果表明：采用内层鳞片作外植体，在ＭＳ＋ＮＡＡ２．０ｍｇ／Ｌ＋ＢＡ２．０ｍｇ／Ｌ＋０．２％活性炭的培养基上，黑暗处理５～１０ｄ，可大大提高鳞茎愈伤组织的诱导率，其诱导率可达５３％．