タバコ・モザイク・ウイルスに対する植物の感受性に及ぼす接種前の高温と低温の影響

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When Nicotiana glutinosa, French bean, and Xanth-nc tobacco plants, local lesion hosts of tobacco mosaic virus (TMV), were kept at low temperature (14-16 C) for 3 days before TMV inoculation, a remarkable decrease was found in their susceptibility to TMV. Such a pre-inoculation treatment gave the same result with a combination of detached N. glutinosa leaves and TMV. When half-leaves of N. glutinosa were inoculated after incubation at 17 C for 3 days and transferred to 25 C, local lesions produced on them extremely decreased in number as compared with those on control half-leaves which had been kept stationarily at 25 C. The number of local lesions decreased to 50% of the control even when the half-leaves were kept at 17 C only for 3-8 hr. Also in a combination of TMV and Samsun tobacco, a systemic host of TMV, the number of heat-induced necrotic lesions was decreased by keeping the half-leaves at 17 C before TMV inoculation. To the contrary, when half-leaves of N. glutinosa were kept at high temperature (36 C) for 3-8 hr and transferred to 25 C after TMV inoculation, the number of local lesions increases 2.4-2.8 times as many as those on control half-leaves which were kept stationarily at 25 C. Similarly, when the half-leaves of N. glutinosa kept at 30 C or 25 C for 8 hr before TMV inoculation were transferred to 25 C or 17 C, respectively, local lesions considerably increased. However, no significant difference in the number of local lesions was found among the half-leaves kept always at 36 C, 30 C, 25 C, or 17 C before and after TMV inoculation. These results indicate that the decrease or increase in the susceptibility of a plant to TMV infection may be due to some physiological conditions induced by the change of environmental temperature under which it is grown. The rate of RNA and protein synthesis, or the number of ectodesmata in epidermal leaf cells, seemed to have no relation to the mechanism of the decreased or increased susceptibility.
日本植物病理学会の論文
1977-04-25

タバコ・モザイク・ウイルスに対する植物の感受性に及ぼす接種前の高温と低温の影響

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