00228483

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Version of Record

サムスン タバコ ショクブツ タイナイ ニオケル タバコ モザイク ウイルス ノ イコウ

The Movement of Tobacco Mosaic Virus within the Plant of Nicotiana tabacum L. cv. Samsun

Japanese (日本語)

神戸大学農学部研究報告

11(2)

245-248

神戸大学農学部

1975

2006-09-15

本文ファイルは、国立情報学研究所CiNiiより提供されたものです。

As a rule, the plant of Nicotiana tabacum L. cv. Samsun (Samsun tobacco) affected with tobacco mosaic virus (TMV) produces no local lesions and develops systemically mosaic mottle. On the contrary, the plant of N. rustica L., which responds with local necrotic lesions to infection with TMV, usually produces top necrosis followed soon by lethal systemic necrosis. The present writers have suggested previously (Miyamoto and Miyamoto, 1973) that the top necrosis caused by TMV in N. rustica plants is able to occur under the condition without roots, and that the virus which was transported through the petiole of the inoculated leaf seems to move simultaneously to both upward and downward directions in the stem. Some experiments have been conducted to ascertain the virus movement within the plant of Samsun tobacco inoculated with TMV (ordinary strain) in comparison with that in the plant of N. rustica. In some tests, all the plants of Samsun tobacco tested were divided into two groups and roots of the plants of one group were cut off at the basal protion of the stem and then all the plants of both the groups were inoculated with TMV and water-cultured individually. As a result, there was found no essential difference in the time of first appearance of mosaic mottle or in the mode of appearance of the symptom among plant individuals tested which involved both the plants with and without roots. Also, recovery tests from the upper young leaves and the basal portions of stems of the inoculated plants with and without roots showed no essential difference in the movement of the virus between the two groups. In other tests, furthermore, in which the stem-end slices (0.5-1.0cm thick) of some tested plants without roots were cut off almost every one to two days during the experimental period to exclude the possible morphologic and metabolic changes for root formation, all these facts mentioned above were confirmed. These results suggest that TMV which was transported through the petiole of the inoculated leaf moves simultaneously to both upward and downward directions in the stem of Samsun tobacco as well as in that of N. rustica, although the responses of both the plants to infection with TMV are very different.

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