ISHS Acta Horticulturae 673: IX International Symposium on Flower Bulbs
RESISTANCE OF TULIP CULTIVARS TO MILD MOTTLE MOSAIC DISEASE |
| Authors: | T. Morikawa, Y. Taga, T. Morii |
| Keywords: | Tulipa, tulip mild mottle mosaic virus, Ophiovirus, Olpidium, resistance |
| Abstract:
Tulip mild mottle mosaic disease, caused by Tulip mild mottle mosaic virus (TMMMV; genus Ophiovirus) is one of the most serious diseases in some bulb-producing areas of Japan. The virus is transmitted by the soil-inhabiting fungus Olpidium brassicae. To evaluate the degree of resistance of tulip cultivars to this disease, bulb lots of 214 cultivars were planted and cultivated in a field infested with the disease for 2 years, then cultivated another year in pots of un-infested soil. TMMMV infection in peduncles of tulip plants was examined every year when the cultivars flowered, using tissue blot immunoassay (TBIA). The resistance levels of the cultivars were classified according to viral infection rates. It was found that resistance to the disease varied greatly. The TMMMV infection rates among cultivars ranged from 0 to 100%. Twenty-four cultivars, with infection rates of less than 5%, were shown to be highly resistant. Forty-three cultivars, with infection rates as high as 61%, were shown to be clearly susceptible. Virus transmission through progeny bulbs was clearly diminished on ca. 20 cultivars, which fell into either the resistant or moderately resistant category. The cultivars that showed resistance (to primary or secondary infection with TMMMV) will be used to breed new resistant cultivars. | |
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