Differential reactions to tobacco mosaic virus infection in tobacco plants nicotiana tabacum cultivar samsun nn 2. a comparative ultrastructural study of the virus induced necroses with those of xanthi nc

Gianinazzi, S.; Schneider, C.

Phytopathologische Zeitschrift 96(4): 313-323


ISSN/ISBN: 0031-9481
Accession: 005157168

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Transfer of TMV-infected Samsun 'NN' tobacco from 25.degree. C to 11.degree. C results in increased starch grain size, chloroplast disorganization, plasmalemma rupture, appearance of electron translucent areas in the nucleus, vesicular bodies in the chloroplasts and acute deformation of the nucleus, leading to cell death (necrosis). These ultrastructural changes are comparable to those occurring during the hypersensitive reaction to TMV in 'Xanthi-nc' tobacco leaves. Virus multiplication is stopped by active mechanisms in the living cells surrounding necroses, the formation of the latter being a consequence and not the cause of arrested virus multiplication. That the necroses in the 2 tobacco varieties could be the same host response to TMV infection is discussed.