新弱毒ウイルスL_<11>A237

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L_<11>A, an attenuated tomato strain of TMV which has been efficiently used for the protection of tomato plants against mosaic disease, proved to be inffective for protecting the existing TMV-resistant tomato cultivars having Tm-1 gene, possibly because the strain hardly multiplies in these cultivars, consequently the plants are readily infected by a virurent strain, e. g., CH2. For the purpose of obtaining another attenuated strain enough effective for protecting these cultivars, a new attenuated strain of TMV, L_<11>A 237, was isolated by successive passages of L_11A through TMV-resistant GCR 237 tomato (Tm-1/Tm-1). The new strain, alike L_11A, causes no symptoms in tomato and Samsun tobacco, but differs in that it multiplies much faster than L_11A in the existing TMV-resistant tomato cultivars (Tm-1/+) and sometimes causes necrotic rings on Xanthi nc in the environment in which L_11A causes necrotic spots. In cross protection tests in resistant tomato cultivars, L_<11>A 237 interfered more strongly with the multiplication of CH2, a virulent tomato strain of TMV infective to resistant tomato cultivars (Tm/+), than L_11A did. In the experiment in a plastic green house the inoculation of resistant tomato seedlings (cv. Tanomo, Tm-1/+) by L_<11>A 237 resulted the good control of mosaic disease, and an higher yield than the yield of a plot which had not been inoculated with this attenuated virus. In the plastic greenhouse of a tomato grower the effectiveness of L_<11>A 237 and L_11A was compared using Tanomo tomato plants. The hundred-times diluted saps of L_<11>A 237-and L_11A-infected tomato leaves were mixed with 1 percent 800 mesh carborundum and inoculated totomato seedlings at the distance of 10 cm by working pressure of 5 kg per cm^2 with a motive sprayer. About 10 days later L_<11>A 237 and L_11A garanteed 67 and 7 per cent infections and tomato plants inoculated showed mosaic symptoms of wild virus by 1 and 25 per cent after 5 months respectively. These results indicate that L_<11>A 237 is very effective for the protection of the ordinary TMV-resistant tomato cultivars (Tm-1/+) from the infection by a virulent strain like CH2.
日本植物病理学会の論文
1978-09-25

新弱毒ウイルスL_<11>A237

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